Distinctive behavior of superconducting fluctuations and pseudogap in nearly optimally doped single crystal of HgBa2CuO4+δ

M. S. Grbić, N. Barišić, A. Dulčić, I. Kupčić, Y. Li, X. Zhao, G. Yu, M. Dressel, M. Greven, M. Požek

Research output: Contribution to journalArticlepeer-review

Abstract

We have applied an unconventional microwave measurement approach to a nearly optimally doped HgBa2CuO4+δ single crystal. The sample geometry assured the total lateral penetration of microwaves due to weak c-axis screening currents. With this configuration, one can achieve excellent sensitivity to small changes in conductivity. The data show that the pseudogap opens at T=185(15)K, which is almost twice the superconducting critical temperature Tc=94.3K. In contrast, the superconducting fluctuation regime is clearly confined to a narrow temperature range Tc<T<T′≈ 105(2)K, far below T. This is confirmed by the magnetic field dependence of the microwave absorption. Hence, our results support the distinction between the physical processes of pseudogap and the superconducting ordering.

Original languageEnglish (US)
Pages (from-to)S228-S229
JournalPhysica C: Superconductivity and its applications
Volume470
Issue numberSUPPL.1
DOIs
StatePublished - Dec 1 2010

Keywords

  • Fluctuations
  • High temperature superconductors
  • Microwaves

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