Two distinct superconducting fluctuation diamagnetisms in Bi2Sr2−xLaxCuO6+δ

H. Xiao; T. Hu; W. Zhang; Y. M. Dai; H. Q. Luo; H. H. Wen; C. C. Almasan; X. G. Qiu

doi:10.1103/PhysRevB.90.214511

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Two distinct superconducting fluctuation diamagnetisms in Bi2Sr2−xLaxCuO6+δ

H. Xiao, T. Hu, W. Zhang, Y. M. Dai, H. Q. Luo, H. H. Wen, C. C. Almasan, X. G. Qiu

DOI 10.1103/PhysRevB.90.214511 · Physical Review B

T1

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Abstract

Superconducting fluctuations were studied through angular-dependent torque measurements on a series of Bi2Sr2−xLaxCuO6+δ (BSLCO) single crystals. Two distinct superconducting fluctuation diamagnetisms were observed: one is the superconducting thermal fluctuation, with a boundary close to the superconducting phase boundary, while the other one, up to a temperature as high as about 180 K, showing maximum signal in the sample with hole carrier density p=0.125, could be due to preformed pairs. In addition, we observed linearly temperature-dependent paramagnetic torque signals in BSLCO samples, possibly a result of quantum criticality from a quantum critical point at the optimal doping.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure unresolved	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown