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1995 Fiscal Year Final Research Report Summary

DEVELOPMENT OF CONDUCTION CARRIER SPECTROSCOPY AND ITS APPLICATION TO THE STUDY OF HIGH TEMPERATURE SUPERCONDUCTORS

Research Project

Project/Area Number 06452140
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Applied physics, general
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

SASAKI Minoru  HIROSHIMA UNIVERSITY,FACULTY OF SCIENCE ASSOCIATE PROFESSOR, 理学部, 助教授 (10116593)

Co-Investigator(Kenkyū-buntansha) NEGISHI Hiroshi  HIROSHIMA UNIVERSITY,FACULTY OF SCIENCE RESEARCH ASSOCIATE, 理学部, 助手 (80164656)
INOUE Masasi  HIROSHIMA UNIVERSITY,FACULTY OF SCIENCE PROFESSOR, 理学部, 教授 (10020223)
Project Period (FY) 1994 – 1995
KeywordsPulsed laser / Conduction carrier spectroscopy / High temperature superconductors / Transient thermoelectric effect / Dynamic transport properties
Research Abstract

Our newly developed technique is a "dynamical" one, called the pulsed-laser induced "Transient Thermoelectric Effect (TTE) " method, in which after a pulsed laser is irradiated upon one end of a sample, one measures an induced voltage across both ends of the sample and analyzes its decay profile, from which we can obtain valuable information about thermal diffusions of photo-generated carriers (and phonons) drifting along the concentration and temperature gradient in the sample. This technique is particularly useful for a multicarrier system consisting of both conduction electrons and holes, ---we refer to as "conduction-carrier spectroscopy". For a more general application of this technique, we are undertaking the TTE experiments under an applied magnetic field and under a steady flow of adc electric current to get further information about transport properties of various materials, such as high T_c oxide superconductors, semiconductors and quasi-two-dimensional molybdenum oxides that show a metal-semiconductor transition due to charge-density-wave instabilities. We have improved the hitherto-made TTE apparatus with the fixed laser wavelength of 1064 nm with a Nd : YAG to a variable range of 690-1320 nm using a combined laser source of Ti : Sapphire/Foresterite with the Nd : YAG source, a detectable time range from 50 ns down to as fast as 1 ns with a digital oscilloscope, and laser intensity reduced by one tenths of the previous one as well. With this improved apparatus we have obtained valuable information about the carrier generation/recombination processes in a p-type GaAs crystal, as a test sample, due to band-band and band-EL2 centers transitions. Computer simulation of the photogenerated carrier diffusion under an ambipolar internal field for n-type GaAs has also been performed to understand the TTE process.

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] M. Inoue: "Charge-Density-Wave Induced Mult's carrier Transport in Quasi-Two-Dimensional η-Mo_4O_<11>" Physica B. 194-196. 1329-1330 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Sasaki: "Transient Thermoelectric Effect of Bjismuth Crystal under Static Magnetic Field" Physica B. 194-196. 1199-1200 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Sasaki: "Dydnamic Transport Measurements of YBa_2Cu_3O_<7-δ> Single Crystals" Physica B. 194-196. 2137-2138 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Sasaki: "Transient Thermo electric Effect in Bismuth Single Crystals" J. Appl. Phys.75. 4520-4526 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] V. A. Kulbachinskii: "Valaence-Band Energy Spectrum of Narrow Gap Semiconductor Solid Solutions of Bi_2-xSn_xTe_3 Single Crystals" Phys. Rev. B. 50. 16921-16930 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] W. X. Gao: "Dynamic Studies of Transport Properties of γ-Mo_4O Crystals Using Photoinduced Transient Thermo electric Effect under Static Electric Field" J. Phys. Soc. Jpn.64. 518-526 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] V. A.Kulbachinskii: "Studies of valence band changes in Sb_<2-x>In_xTe_3 and Sb_2Te_<3-y>Se_y by transport and Slubniko v-de Haas effect measurements" Phys. Rev. B. 52 (印刷中). (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Veda: "Computer Simulations of Pulsed-Laser Induced Co Herent Plasma Oscillations in GaAs Crystals" J. Phys. Soc. Jpn.65 (印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] W. X. Gao: "Oscillatory Behaviors of Photo generated Carrier Diffusion in γ-Mo_4Oi, under Magnetic Field" J. Low Temp. Phys.102 (印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Inoue, M.Sasaki, M.Koyano, H.Negishi, and W.X.Gao: "Charge-Density-Wave Induced Multicarrier Transport in Quasi-Two-Dimensional eta-Mo_4O_<11>" Physica B. 194-196. 1329 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Sasaki, G.X.Tai, M.Koyano, H.Negishi, H.Bidadi, and M.Inoue: "Transient Thermoelectric Effect of Bismuth Crystal under Static Magnetic Field" Physica B. 194-196. 1199 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Sasaki, M.Koyano, H.Negishi, M.Inoue, and H.Takei: "Dynamic Transport Measurements of YBa_2Cu_3O_<7-delta> Single Crystals" Physica B. 194-196. 2137 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Sasaki, G.X.Tai, M.Inoue, and H.Bidadi: "Transient Thermoelectric Effect in Bismuth Single Crystals" J.Appl.Phys.75, No.9. 4520 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] V.A.Kulbachinskii, M.Inoue, M.Sasaki, H.Negishi, W.X.Gao, Y.Giman, P.Lostak, and J.Horak: "Valence-Band Energy Spectrum of Narrow Gap Semiconductor Solid Solutions of Bi_<2-x>Sn_xTe_3 Single Crystals" Phys.Rev.B. 50. 16921 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W.X.Gao, M.Sasaki, H.Negishi, M.Inoue, and V.A.Kulbachinskii: "Dynamic Studies of Transport Properties of gamma-Mo_4O_<11> Crystals Using Photoinduced Transient Thermoelectric Effect under Static Electric Field" J.Phys.Soc.Jpn.64, No.2. 518 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] V.A.Kulbachinskii, Z.M.Dashevskii, M.Inoue, M.Sasaki, H.Negishi, W.X.Gao, P.Lostak, J.Horak, and A.de Visser: "Studies of valence band changes in Sb_<2-x>In_xTe_3 and Sb_2Te_<3-y>Se_y by transport and Shubnikov-de Haas effect measurements" Phys.Rev.B. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Ueda, K.Kusano, M.Sasaki, and M.Inoue: "Computer Simulations of Pulsed-Laser Induced Coherent Plasma Oscillations in GaAs Crystals" J.Phys.Soc.Jpn.(in press).(1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W.X.Gao, M.Sasaki, H.Negishi, K.Takase, and M.Inoue: "Oscillatory Behaviors of Photogenerated Carrier Diffusion in gamma-Mo_4O_<11> under Magnetic Field" J.Low Temp.Phys.(in press).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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