Successive superconducting transitions and Anderson localization effect in Ta$_{2}$S$_{2}$C

Jürgen Walter; Itsuko S. Suzuki; Masatsugu Suzuki

doi:10.1103/PhysRevB.70.064519

paper

Successive superconducting transitions and Anderson localization effect in Ta $_{2}$ S $_{2}$ C

arXiv:cond-mat/0309561 · doi:10.1103/PhysRevB.70.064519

Abstract

A complex carbide Ta $_{2}$ S $_{2}$ C consists of van der Waals (vdw)-bonded layers with a stacking sequence $...$ C-Ta-S-vdw-S-Ta-C- $...$ along the c axis. The magnetic properties of this compound have been studied from DC and AC magnetic susceptibility. Ta $_{2}$ S $_{2}$ C undergoes successive superconducting transitions of a hierachical nature at $T_{c l} = 3.61 \pm 0.01$ K [ $H_{c 1}^{(l)} (0) = 28 \pm 2$ Oe and $H_{c 2}^{(l)} (0) = 7.7 \pm 0.2$ kOe] and $T_{c u} = 9.0 \pm 0.2$ K [ $H_{c 2}^{(u)} (0) = 6.0 \pm 0.3$ kOe]. The intermediate phase between $T_{c u}$ and $T_{c l}$ , where $δ χ (= χ_{F C} - χ_{Z F C}) \approx 0$ , is an intra-grain superconductive state occurring in the Ta-C layers in Ta $_{2}$ S $_{2}$ C. The low temperature phase below $T_{c l}$ , where $δ χ$ clearly appears, is an inter-grain superconductive state. The magnetic susceptibility at $H$ well above $H_{c 2}^{(l)} (0)$ is described by a sum of a diamagnetic susceptibility and a Curie-like behavior. The latter is due to the localized magnetic moments of conduction electrons associated with the Anderson localization effect, occurring in the 1T-TaS $_{2}$ type structure in Ta $_{2}$ S $_{2}$ C.

12 pages, 13 figures; submitted to Phys. Rev. B

Successive superconducting transitions and Anderson localization effect in Ta2​S2​C

Abstract

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Successive superconducting transitions and Anderson localization effect in Ta $_{2}$ S $_{2}$ C