Elsevier

Solid State Communications

Volume 92, Issue 7, November 1994, Pages 613-618
Solid State Communications

Magnetism and reentrant superconductivity in κ-(BEDT-TTF)2Cu[N(CN)2]Cl under pressure

https://doi.org/10.1016/0038-1098(94)00548-6Get rights and content

Abstract

Previous resistivity measurements have shown that magnetic fields can enhance or even induce reentrant superconductivity (i.e. existence of SC only in a finite temperature interval between Tc1 and Tc2) in the title compound in a rather wide pressure range. By means of d.c. magnetization measurements we show that indeed the magnetic field has an effect on the pressure range in which reentrant volume superconductivity exists. We also observe that the magnetic/diamagnetic properties of the samples are influenced by the thermal history. The diamagnetic reentrance can e.g. be incomplete if the cooling speed is too fast (typically faster than 0.1 K min−1). Also, the Meissner signal on warming up from the reentrant state below Tc2 can be about 6 times larger than the Meissner signal on cooling down from the normal state above Tc1. These observations together with the previously observed magnetic remanence below Tc2 and the exchange of latent heat at Tc2 lead us to believe that the reentrant transition into a magnetic ground state is of first order and is accompanied by a subtle change in lattice structure.

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