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Energy gaps in Bi(2)Sr(2)CaCu(2)O(8+?) cuprate superconductors.

ABSTRACT: The relationship between the cuprate pseudogap (?(p)) and superconducting gap (?(s)) remains an unsolved mystery. Here, we present a temperature- and doping-dependent tunneling study of submicron Bi(2)Sr(2)CaCu(2)O(8+?) intrinsic Josephson junctions, which provides a clear evidence that ?(s) closes at a temperature T(c) (0) well above the superconducting transition temperature T(c) but far below the pseudogap opening temperature T*. We show that the superconducting pairing first occurs predominantly on a limited Fermi surface near the node below T(c) (0), accompanied by a Fermi arc due to the lifetime effects of quasiparticles and Cooper pairs. The arc length has a linear temperature dependence, and as temperature decreases below T(c) it reduces to zero while pairing spreads to the antinodal region of the pseudogap leading to a d-wave superconducting gap on the entire Fermi surface at lower temperatures.

SUBMITTER: Ren JK

PROVIDER: S-EPMC3272663 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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Energy gaps in Bi(2)Sr(2)CaCu(2)O(8+δ) cuprate superconductors.

Ren J K JK Zhu X B XB Yu H F HF Tian Ye Y Yang H F HF Gu C Z CZ Wang N L NL Ren Y F YF Zhao S P SP

Scientific reports 20120206

The relationship between the cuprate pseudogap (Δ(p)) and superconducting gap (Δ(s)) remains an unsolved mystery. Here, we present a temperature- and doping-dependent tunneling study of submicron Bi(2)Sr(2)CaCu(2)O(8+δ) intrinsic Josephson junctions, which provides a clear evidence that Δ(s) closes at a temperature T(c) (0) well above the superconducting transition temperature T(c) but far below the pseudogap opening temperature T*. We show that the superconducting pairing first occurs predomina ...[more]

PMID: 22355760

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