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Anomalous thermoelectric power of overdoped Bi2Sr2CaCu2O8 superconductor

J. Appl. Phys. 106, 096102 (2009); doi:10.1063/1.3248265

Published 4 November 2009

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V. P. S. Awana,1 Jagdish Kumar Bains,1,3 G. S. Okram,2 Ajay Soni,2 P. K. Ahluwalia,3 and H. Kishan1
1National Physical Laboratory (CSIR), Dr. K.S. Krishnan Marg, New Delhi 110012, India
2UGC-DAE Consortium for Scientific Research, Indore 452001, India
3Himachal Pradesh University, Shimla 171005, India
All the samples possess single-phase character and their superconducting transition temperatures (T<sub>c</sub><sup>R = 0</sup>) are 85, 90, and 72 K, respectively for Bi2212-MQ, Bi2212-N2, and Bi2212-O2. Though the Bi2212-MQ and Bi2212-N2 samples are in near optimum doping regime, the Bi2212-O2 is an overdoped sample. T<sub>c</sub><sup>S = 0</sup> values obtained through S(T) data are also in line with those determined from the temperature dependence of resistance (T<sub>c</sub><sup>R = 0</sup>) and dc magnetization (T<sub>c</sub><sup>dia</sup>). Interestingly, S(T) behavior of the optimally doped Bi2212-MQ and Bi2212-N2 samples is seen to be positive in whole temperature range, the same is found negative for the overdoped Bi2212-O2 sample above T<sub>c</sub><sup>S = 0</sup>. This anomalous S(T) behavior is seen in the light of the recent band structure calculations and the ensuing split Fermi surface as determined by angle-resolved photoelectron spectroscopy. ©2009 American Institute of Physics
History: Received 1 July 2009; accepted 20 September 2009; published 4 November 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/096102/1
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KEYWORDS and PACS

Keywords
PACS
  • 74.25.Fy
    Transport properties of superconductors
  • 74.72.Hs
    Bi-based cuprates (HTSC)
  • 81.40.Gh
    Other heat and thermomechanical treatments
  • 81.20.-n
    Methods of materials synthesis and materials processing
  • 79.60.-i
    Photoemission and photoelectron spectra (condensed matter)
  • 74.25.Jb
    Electronic structure of superconductors
  • 74.25.Ha
    Magnetic properties of superconductors
  • 74.10.+v
    Occurrence of superconductivity
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (32)
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