Evidence of two-dimensional quantum critical behavior in the superfluid density of extremely underdoped Bi2Sr2CaCu2O8+x

Article

关键词: THERMAL PHASE FLUCTUATIONS;    MAGNETIC PENETRATION DEPTH;    SUPERCONDUCTING FILMS;    2-COIL APPARATUS;    T-C;    CONDUCTIVITY;    CRYSTALS;    ARRAYS;   

DOI  :  10.1103/PhysRevB.85.180507

来源: SCIE

【 摘 要 】

Evidence of two-dimensional (2D) quantum critical fluctuations is observed in the superfluid density n(s)(T) proportional to lambda(-2)(T) of extremely underdoped Bi2Sr2CaCu2O8+x (Bi-2212) films, indicating that, in general, quantum fluctuations play a dominant role in underdoped cuprates. Two-dimensional (2D) fluctuations are expressed by the linear scaling T-c proportional to n(s)(0). 2D scaling in Bi-2212 contrasts with three-dimensional scaling that is seen in the much less anisotropic YBa2Cu3O7-delta Quantum critical fluctuations could also account for the absence of thermal critical behavior in lambda(-2)(T) of strongly underdoped Bi-2212 samples, T-c < 48 K.

【 授权许可】

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