c-axis magnetoconductivity of anisotropic superconducting single crystals: The density-of-states fluctuation scenario

A. Wahl; D. Thopart; G. Villard; A. Maignan; V. Hardy; J. C. Soret; L. Ammor; A. Ruyter

doi:10.1103/PhysRevB.59.7216

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c-axis magnetoconductivity of anisotropic superconducting single crystals: The density-of-states fluctuation scenario

A. Wahl, D. Thopart, G. Villard, A. Maignan, V. Hardy, J. C. Soret, L. Ammor, A. Ruyter

DOI 10.1103/PhysRevB.59.7216 · Physical Review B

T1

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Abstract

The c-axis magnetoconductivity (B‖c‖I) of (Tl,Hg)2Ba2Ca2Cu3O10+δ (Tl 2223) and (Hg,Cu)Ba2CuO4+δ (Hg 1201) single crystals has been measured. For Tl 2223, the observed change of sign in magnetoconductivity is explained in terms of density-of-states (DOS) fluctuations and competition of this effect with the positive Aslamasov-Larkin contribution. The mercury-based compound (Hg 1201) does not show such an anomaly. Indeed, in accordance with the theory, owing to its low anisotropy, this material shows a vanishing DOS contribution preventing any change of sign in the experimental magnetoconductivity. Besides, the nature of the impurity state and the pair-breaking regime are discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(Tl,Hg)2Ba2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(Hg,Cu)Ba2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown