Superconducting fluctuation probed by in-plane and out-of-plane conductivities in Tl2Ba2CaCuO8+y single crystals

Heon-Jung Kim; P. Chowdhury; W. N. Kang; Dong-Jin Zang; Sung-Ik Lee

doi:10.1103/PhysRevB.67.144502

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Superconducting fluctuation probed by in-plane and out-of-plane conductivities in Tl2Ba2CaCuO8+y single crystals

Heon-Jung Kim, P. Chowdhury, W. N. Kang, Dong-Jin Zang, Sung-Ik Lee

DOI 10.1103/PhysRevB.67.144502 · Physical Review B

T1

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Abstract

Extensive measurements of the in-plane and the out-of-plane zero field resistivities [ρab(T,0),ρc(T,0)] and the magnetoresistivities [ρab(T,H),ρc(T,H)] of high-quality Tl2Ba2CaCu2O8+y single crystals were carried out. The obtained zero field fluctuation conductivities [Δσab(T,0),Δσc(T,0)] and fluctuation-induced magnetoconductivities [Δσab(T,H) and Δσc(T,H)] were analyzed based on the theory of thermal fluctuations of the superconducting order parameters, originated from fluctuations of the quasiparticle density of states as well as the Aslamazov-Lakin and Maki-Thompson contributions. We observed that Δσab(T,H) and the sign change in Δσc(T,H) near Tc could be described adequately only if the density of states contribution was included. The important physical parameters, such as the coherence length (ξ), the in-plane scattering time (τ), and the hopping integral (J), obtained during these analyses are compared with the corresponding parameters for other high−Tc materials.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tl2Ba2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	106	Pressure not reported	onset
Tl2Ba2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown