Faculty Information

Pei-Herng HorPei-Herng Hor

Associate Professor
Department of Physics

Office: UH Science Center, 264A
Contact: phor@uh.edu - (713) 743-8300

Education: Ph.D., University of Houston, 1990, B.S., Tamkang University

The study of the mechanism of high temperature superconductivity and materials of unusual physical properties with reduced dimensionality.

We focus on two most challenging problems related to the high temperature superconductivity: (a) The pairing and condensation mechanism(s) of high temperature superconductors that produce high Tc; (b) The normal state properties of the doped two dimensional electron systems that have defied the current theory for metal.

The development of magnetic resonance imaging guided high intensity focused ultrasound for bio/medical applications.

Magnetic resonance imaging guided high intensity focused ultrasound (MRgHIFU) surgery is a noninvasive thermal ablation method that uses MR imaging for precision target definition, treatment planning, and closed-loop controlled of ultrasound energy delivery.

While MRgHIFU surgery is quickly emerging as a real time non-invasive precision surgical resection procedure for the treatment such as uterine fibroids, breast, liver, prostate and brain cancers 2. It is much less appreciated that MRgHIFU, due to the extra degrees of freedom provides by the HIFU, presents unique opportunities for us to develop novel diagnostic and fundamental experimental tools for both medical and biological researches.

The study and development of the Thermal Metabolic imaging (TMI).

TMI is a functional imaging which studies the surface manifestations of various internal metabolic heat sources. We correlate the characteristics of surface temperature distribution as a function of size, depth and types of internal heat source under various physiological conditions through bio-heat modeling.

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  • Unified electronic phase diagram for hole-doped high-Tc cuprates Honma, T.and Hor, P. Physical Review B: Condensed Matter and Materials Physics (2008), 77, 184520/1-184520/16.
  • Robust intrinsic electronic superconducting phases in underdoped La2-xSrxCuO4 single crystals Dong, X. L.; Hor, P. H.; Zhou, F.; Zhao, Z. X. Solid State Communications (2008),Vol 145/4 pp 173-177.
  • A basic step toward understanding skin surface temperature distributions caused by internal heat sources. Wu Zheng; Liu Hui Helen; Lebanowski Logan; Liu Zhongqi; Hor Pei Herng Physics in medicine and biology (2007), 52(17), 5379-92.
  • Anisotropic nature of superconductivity in hexagonal rubidium tungsten bronze Rb0.23WO3 Ting, L. C.; Pan, J. J.; Liao, T. W.; Hsieh, H. H.; Chien, F. Z.; Hor, P. H.; Ling, D. C. Chinese Journal of Physics (Taipei, Taiwan) (2007), 45(2, Pt. 2), 237-243.
  • Effect of Oxygen Concentration on Superconducting Properties of Rubidium Tungsten Bronzes Rb x WO y. Ting, L. C.; Hsieh, H. H.; Kang, H. H.; Ling, D. C.; Liu, H. L.; Pong, W. F.; Chien, F. Z.; Hor, P. H. Journal of Superconductivity and Novel Magnetism (2007), 20(3), 249-253.
  • Intrinsic electronic superconducting phases at 60 K and 90 K in double-layer YBa2Cu3O6 . Honma, T.and Hor, P. Physical Review B: Condensed Matter and Materials Physics (2007), 75(1), 012508/1-012508/4.
  • Charge crystal model for the high-Tc superconductivity. Kim, Y. H.and Hor, P. H. Modern Physics Letters B (2006), 20(10), 571-584.
  • Universal optimal hole-doping concentration in single-layer high-temperature cuprate superconductors. T. Honma and P. H. Hor, Superconductor Science and Technology (2006), 19(9), 907-911.
  • Anomalies at the compensation temperature in the zero-magnetization ferromagnet (Sm,Gd)Al2. Chen, X. H.; Wang, K. Q.; Hor, P. H.; Xue, Y. Y.; Chu, C. W. Physical Review B: Condensed Matter and Materials Physics (2005), 72(5), 054436/1-054436/5.
  • Evidence of coherent c-axis charge transport in underdoped La2-xSrxCuO4 superconductors. Kim, Y. H.; Hor, P. H.; Dong, X. L.; Zhou, F.; Zhao, Z. X.; Wu, Z.; Xiong, J. W. Physical Review B: Condensed Matter and Materials Physics (2005), 71(13), 139901/1.
  • Evidence of coherent c-axis charge transport in underdoped La2-xSrxCuO4 superconductors. Kim, Y. H.; Hor, P. H.; Dong, X. L.; Zhou, F.; Zhao, Z. X.; Wu, Z.; Xiong, J. W. Physical Review B: Condensed Matter and Materials Physics (2005), 71(9), 092508/1-092508/4.
  • Universal intrinsic scale of the hole concentration in high-Tc cuprates. Honma, T.; Hor, P. H.; Hsieh, H. H.; Tanimoto, M. Physical Review B: Condensed Matter and Materials Physics (2004), 70(21), 214517/1-214517/10.
  • Pseudogap and superconductivity on a common scale of hole concentration for high-Tc superconductors. Honma, T.; Hor, P. H.; Hsieh, H. H.; Tanimoto, M. Physica C: Superconductivity and Its Applications (Amsterdam, Netherlands) (2004), 408-410 670-671.
  • Anomalous superconducting properties at magic doping levels in under-doped La2-xSrxCuO4 single crystals. Zhou, F.; Hor, P. H.; Dong, X. L.; Ti, W. X.; Xiong, J. W.; Zhao, Z. X. Physica C: Superconductivity and Its Applications (Amsterdam, Netherlands) (2004), 408-410 430-433.
  • The composite picture of the charge carriers in La2-xSrxCuO4 (0.063 x 0.11) superconductors. Kim, Y. H.; Hor, P. H.; Dong, X. L.; Zhou, F.; Zhao, Z. X.; Song, Y. S.; Ti, W. X. Journal of Physics: Condensed Matter (2003), 15(49), 8485-8494.
  • Under-doped La2-xSrxCuO4 with x = 0.063-0.125: TSFZ growth of high-quality crystals and anomalous doping dependences of superconducting properties. Zhou, F.; Ti, W. X.; Xiong, J. W.; Zhao, Z. X.; Dong, X. L.; Hor, P. H.; Zhang, Z. H.; Chu, W. K. Superconductor Science and Technology (2003), 16(3), L7-L9.
  • Metal-Nonmetal Transition in Rubidium Tungsten Bronze RbxWOy. Ting, L. C.; Hsieh, H. H.; Huang, C. T.; Wang, C. B.; Ling, D. C.; Huang, K. J.; Chang, S. J.; Kang, H. H.; Chien, F. Z.; Hor, P. H. Journal of Superconductivity (2002), 15(6), 675-678.
  • Hall coefficient of the oxygen-intercalated La214 superconductor in the low hole concentration region. Yomo, S.; Li, Z. G.; Hor, P. H.; Mori, N. Physica C (2002), 378-381(Pt. 1), 199-202.
  • Intrinsic tendency of electronic phase separation into two superconducting states in La2-xSrxCuO4 Lorenz, B.; Li, Z. G.; Honma, T.; Hor, P.-H. Physical Review B: Condensed Matter and Materials Physics (2002), 65(14), 144522/1-144522/11.
  • Superconductivity and charge redistribution under high pressure in the underdoped La1.916Sr0.084CuO4. Honma, T.; Lorenz, B.; Li, Z. G.; Hor, P. H.. Physica C (2000), 341-348,1933-1934.
  • Hole localization and superconductivity in La2CuO4 Yomo, S.; Soga, K.; Li, Z. G.; Hor, P. H.; Mori, N (2000), 341-348, 1851-1852.
  • Pressure induced superconductivity in Y0.83Ca0.17Ba2Cu3O6. Honma, T.; Hor, P. H. Physica C (2000), 341-348, 521-522.
  • Pressure induced transformation of the superconducting state of underdoped La1.985Sr0.015CuO4 ( <0.023). Lorenz, B.; Li, Z. G.; Hor, P.-H. Physica C: (2000), 341-348, 443-444.
  • Superconductivity in Ca-doped Pr-123 system. Zhao, Z. X.; Li, K. Q.; Che, G. C.; Honma, T.; Hor, P. H. Physica C: (2000), 341-348, 331-334.
  • Phase separation effect in cuprate superconductors. Wang, J.; Xing, D. Y.; Dong, Jinming; Hor, P. H.. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, Peop. Rep. China. Physical Review B: Condensed Matter and Materials Physics (2000), 62(14), 9827-9830.
  • Synthesis and Structure of Layered Manganese Oxychalcogenides: Sr2CuMnO3S and Sr4Cu2Mn3O7.5Q2 (Q = S, Se). Zhu, W. J.; Hor, P. H. Journal of Solid State Chemistry (2000), 153(1), 26-29.
  • Gas effusion studies of oxygen-doped cuprates. Li, Z. G.; Hamed, A.; Zhu, W. J.; Hor, P. H. Physica C 341-348, 567-568.
  • Kinetics of oxygen evolution in La2CuO4 Hamed, A.; Li, Z. G.; Hor, P. H.. Advances in Science and Technology (Faenza, Italy) (1999), 23(Science and Engineering of HTC Superconductivity), 405-412.
  • Electrochemical synthesis and characterization of La2CuO4 single crystals. Scarfe, D. P.; Xiong, X.; Zhu, W. J.; Hor, P. H.; Moss, S. C.; Jacobson, A. J. Journal of Materials Research (1999), 14(4), 1221-1226.
  • Synthesis, structure, and properties of layered sulfide BaCo1-xCuxS2-y. Zhu, W. J.; Ting, S. T.; Feng, H. H.; Hor, P. H. Journal of Solid State Chemistry (1998), 138(1), 111-113.
  • High pressure investigation of the layered compound Sr2Cu2CoO2(S1-xSex)2. Lorenz, B.; Zhu, W. J.; Ting, S. T.; Hor, P. H. Koatsuryoku no Kagaku to Gijutsu (1998), 7(Proceedings of International Conference--AIRAPT-16 and HPCJ-38--on High Pressure Science and Technology, 1997), 583-585.
  • A study of the Meissner and shielding effects in annealed La2CuO4 Hor, P. H. and Ting, S. T. Chinese Journal of Physics (Taipei) (1998), 36(2, Pt. 2), 311-315.
  • Crystal structure of new layered oxysulfides: Sr3Cu2Fe2O5S2 and Sr2CuMO3S (M = Cr, Fe, In). Zhu, W. J.and Hor, P. H. Journal of Solid State Chemistry (1997), 134(1), 128-131.
  • A2Cu2CoO2S2 (A = Sr, Ba), a novel example of a square-planar CoO2 layer. Zhu, W. J.; Hor, P. H.; Jacobson, A. J.; Crisci, G.; Albright, T. A.; Wang, S.-H.; Vogt, T. Journal of the American Chemical Society (1997), 119(50), 12398-12399.
  • Sr2CuGaO3S, a Rare Example of Square Pyramidal Gallium. Zhu, W. J.; Hor, P. H.. Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX, USA. Inorganic Chemistry (1997), 36(17), 3576-3577.
  • Unusual layered transition-metal oxysulfides: Sr2Cu2MO2S2 (M = Mn, Zn). Zhu, W. J.; Hor, P. H. Journal of Solid State Chemistry (1997), 130(2), 319-321.
  • Synthesis and characterization of ruthenium pyrochlore oxides La2-xCdxRu2O7- Zhu, W. J.; Ting, S. T.; Hor, P. H. Journal of Solid State Chemistry (1997), 129(2), 308-311.
  • Magnetic properties of some high-temperature superconductors. Huang, C. Y.; Lin, J. G.; Hor, P. H.; Meng, R. L.; Chu, C. W. Editor(s): Batlogg, Bertram. Proceedings of the 10th Anniversary HTS Workshop on Physics, Materials and Applications, Houston, Mar. 12-16, 1996 (1996), 387-388.
  • Carrier-controlled doping efficiency in La2CuO4 Li, Z. G.; Feng, H. H.; Yang, Z. Y.; Hamed, A.; Ting, S. T.; Hor, P. H.; Bhavaraju, S.; DiCarlo, J. F.; Jacobson, A. J. Review Letters (1996), 77(27), 5413-5416.
  • Thermopower and high-pressure electrical conductivity measurements of template synthesized polypyrrole. Orgzall, I.; Lorenz, B.; Ting, S. T.; Hor, P. H.; Menon, V.; Martin, Ch. R.; Hochheimer, H. D. Physical Review B: Condensed Matter (1996), 54(23), 16654-16658.
  • High-pressure low-temperature electrical properties of polypyrrole doped with p-toluenesulfonate. Orgzall, I.; Lorenz, B.; Dunsch, L.; Bartl, A.; Ting, S. T.; Hor, P.-H.; Hochheimer, H. D. Synthetic Metals (1996), 81(1), 59-63.
  • Synchrotron x-ray study of interstitial oxygen ordering in the superconducting phase of La2CuO4 Xiong, X.; Zhu, Q.; Li, Z. G.; Moss, S. C.; Feng, H. H.; Hor, P. H.; Cox, D. E.; Bhavaraju, S.; Jacobson, A. J. Journal of Materials Research (1996), 11(9), 2121-2124.
  • Gas effusion spectra of HgBa2CuO4 Hamed, A.; Ortiz, R.; Feng, H. H.; Li, Z. G.; Hor, P. H.; Xue, Y. Y.; Sun, Y. Y.; Xiong, Q.; Cao, Y.; Chu, C. W. Physical Review B: Condensed Matter (1996), 54(1), 682-687.
  • Phase Separations and Superconductivity in Electrochemiaclly Intercalated La2CuO4 , Hor P.H. ; Feng H.H. ; Li Z.G. ; DiCarlo J. , Bhavaraju S.; Jacobson A.J. J. Phys. Chem. (1996) 57(6), 1061-1065.
  • Synthesis and characterization of layered titanium oxides NaRTiO4 (R = La, Nd and Gd). Zhu, W. J.; Feng, H. H.; Hor, P. H. Materials Research Bulletin (1996), 31(1), 107-11.
  • High pressure study of TbSr2Cu2.7Mo0.3Oy and related oxide superconductors. Yomo, S.; Kawakami, M.; Feng, H. H.; Chu, J. W.; Hor, P. H.; Chu, C. W.; Mori, N. Critical State in Superconductors, Proceedings of Topical International Cryogenic Materials Conference, Honolulu, Oct. 24-26, 1994 (1995),
  • Comprehensive x-ray diffraction study of YBa2Cu3O7-x thin films. Moshfegh, A. Z.; Fatollahi, A. H.; Wang, Y. Q.; Sun, Y. Y.; Hor, P. H.; Ignatiev, A. Japanese Journal of Applied Physics, Part 1: Regular Papers, Short Notes & Review Papers (1995), 34(11), 6036-40.
  • A new titanium perovskite oxide, Na2/3Th1/3TiO3. Zhu, W. J.; Hor, P. H. Journal of Solid State Chemistry (1995), 120(1), 208-9.
  • Electrical transport phenomenon and superconductivity in TbSr2Cu2.7Mo0.3Oy under high pressure. Kawakami, Masashi; Yomo, Shusuke; Feng, H. H.; Chu, J. W.; Hor, P. H.; Chu, C. W.; Mohri, Nobuo. Journal of Advanced Science (1995), 7(1), 27. Publisher: Society of Advanced Science.
  • Superconducting phases of La2CuO4 prepared by electrochemical oxidation at ambient temperature. Feng, H. H.; Li, Z. G.; Hor, P. H.; Bhavaraju, S.; DiCarlo, J. F.; Jacobson, A. J. Physical Review B: Condensed Matter (1995), 51(22), 16499-502.
  • Sublinear behavior of photoconductivity with light intensity in the fullerenes. Hamed, A.; Escalante, R.; Hor, P. H. Solid State Communications (1995), 94(2), 141-5.
  • Electrochemical Intercalation of O in La2CuO4 at Ambient Temperature S. Bhavaraju, J.F. DiCarlo, I. Yazdi, A.J. Jacobson, H.H. Feng, Z.G. Li and P.H. Hor, Materials Research Bulletin 29, 735 (1994).
  • Light Intensity Dependence of the Photoconductivity in C60 Films A. Hamed, R. Escalante and P.H. Hor, Physical Review B 50, 8050 (1994).
  • Temperature and Spectral Dependence of Persistent Photoconductivity in YBa2Cu3Ox Thin Films. L. Bud'ko, H.H. Feng, M.F. Davis, J.C. Wolfe and P.H. Hor, Journal of Superconductivity 7, 743(1994).
  • Effects of Deposition Temperature and Thermal Treatment on the Structure of C60 and C70 Films ," I. Rusakova, A. Hamed and P.H. Hor Proceedings of Material Research Society Symposium Proceedings 349, 101(1994).
  • Stage Number of CuO2-Layer-Based High-Tc Superconductors and Layer Force Range D. Xianxi and P.H. Hor, Physica C 219, 281 (1994).
  • Observation of Crossover from Three to Two Dimensional Variable Range Hopping in Template Synthesized Polypyrrole and Polyanaline J. Spatz, B. Lorenz, K. Weishaupt, H.D. Hochheimer, , V. Menon, R. Parthasarathy, C. Martin, J. Bechtold and P.H. Hor, Physical Review B 50, 14888(1994).
  • Design of a Device for the Simultaneous Application of Uniaxial Stress and Hydrostatic Pressure M. Meir, H.D. Hochheimer, A. Adams and P.H. Hor, High Pressure Research 12, 291(1994).
  • Existence of Persistent Photoconductivity at High Temperatures in C60 Hamed, H. Rasmussen and P. H. Hor Physical Review B "Rapid Communications" 48, 14760(1993).
  • TEM Study of C70 Polycrystalline Films . Rusakova, A. Hamed and P. H. Hor, Physical Review B "Rapid Communications" 48, 14760(1993).
  • Persistent Photoconductivity in Insulating and Superconductivity YBa2Cu3Ox Thin Films Temperature and Spectral Dependence," S. L. Bud'ko, H. H. Feng, M. F. Davis, J. C. Wolfe and P. H. Hor, Physical Review B 48, 16707(1993).
  • Architecture of CuO2-Layer Based High Temperature Superconductors and Related Materials Y. K. Tao, Y. Y. Sun, P. H. Hor and C. W. Chu, J. Sol. State Chem. 105, 171(1993).
  • Exact Treatments of Activation Energy, Quantum Tunneling, and Flux Creep Rate in High-Tc Superconductors Y. L. Ma, X. X. Dai, W. H. Zhong, H. F. Li and P. H. Hor, Physics Letters A 174, 139(1993).
  • Synthesis of Pb2Sr3Pr5Cu5Ox and Pb2Sr3PrCuOd by the Citrate Gel Method Y. K. Tao and P. H. Hor, Materials Chemistry and Physics, Materials Science Communication 35, 92(1993).
  • On the Superconductivity of Pb2Sr2(Ln2-yCey)Cu3O10 Y. Y. Sun, H. H. Feng, Y. K. Tao and P. H. Hor, Physica C 212, 169(1993).
  • Preparation and Characterization of Interface Morphologies of Silver-Sheathed Superconducting Bi-Sr-Ca-Cu-Oxide Ribbons Y. K. Tao, Y. Q. Wang, Y. Y. Xue, P. H. Hor and C. W. Chu, Journal of Materials Science Letters 12, 706(1993).
  • High Pressure Study on RSr2Cu2.7Mo0.3Oy with R = Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb Q. Xiong, Y. Y. Xue, J. W. Chu, Y. Y. Sun, Y. Q. Wang, P. H. Hor and C. W. Chu, Physical Review B 47, 11337(1993).
  • Nonlinear Pressure Dependence of the Transport Critical Current Density in BSCCO-2223 Tapes S. L. Bud'ko, Y. K. Tao, Y. Q. Wang, C. W. Chu and P. H. Hor, Solid State Commun. 86, 441(1993).
  • Effects of Oxygen and Illumination on the in situ Conductivity of C60 Thin Films A. Hamed, Y. Y. Sun, Y. K. Tao, R. L. Meng and P. H. Hor, Physical Review B 47, 10873(1993).
  • Effect of Pressure on the Critical Current Density of YBa2Cu3O7- Thin Films Q. Xiong, Y. Y. Xue, Y. Y. Sun, P. H. Hor, C. W. Chu, M. F. Davis, J. C. Wolfe, S. C. Deshmukh and D. J. Economou, Physica C 205, 307(1993).
  • ac Magnetic Susceptibility of Melt-Textured YBa2Cu3O7- X. C. Jin, Y. Y. Xue, Z. J. Huang, J. Bechtold, P. H. Hor and C. W. Chu, Physical Review B 47, 6082 (1993).
  • Inversion Solution of the Equation of Motion and the Flux Relaxation Law in High Tc Superconductor YBCO X. X. Dai, P. H. Hor, L. Gao and C. W. Chu, Physics Letters A 169, 161(1992).
  • Scaling of the Supercurrent Relaxation and Critical Slowing Down Near the Irreversibility Line in YBa2Cu3O7- L. Gao, Y. Y. Xue, P. H. Hor and C. W. Chu, Physical Review B, "Rapid Communications," 46, 14325(1992).
  • Pressure and Temperature Dependence of Critical Current Density in YBa2Cu3O7- Thin Films S. L. Bud'ko, M. F. Davis, J. C. Wolfe, C. W. Chu and P. H. Hor, Physical Review B 47, 2835(1992).
  • High-Pressure Study on Mo-Stabilized Sr-Based 123 Compounds: YSr2Cu2.8Mo0.2Oy and TbSr2Cu2.7Mo0.3Oy Q. Xiong, Y. Q. Wang, J. W. Chu, Y. Y. Sun, K. Matsuishi, H. H. Feng, P. H. Hor and C. W. Chu, Physica C 198, 70(1992).
  • Stability and Superconductivity in Tb-123 P. H. Hor, J. W. Chu, Y. Q. Wang, H. H. Feng, Y. Y. Sun, K. Matsuishi, Q. Xiong and C. W. Chu, Proceedings of the 1992 TCSUH Workshop, HTS Materials, Bulk Processing and Bulk Applications, edited by C. W. Chu, W. K. Chu, P. H. Hor and K. Salama (World Scientific, Singapore, 1992) p. 53.