H. Posselt et al., REENTRANT MEISSNER EFFECT IN THE ORGANIC CONDUCTOR K-(BEDT-TTF)2CU[N(CN)2]CL UNDER PRESSURE, Physical review. B, Condensed matter, 49(22), 1994, pp. 15849-15852
Metallic kappa-(BEDT-TTF)2Cu[N(CN2]Cl turns semiconducting and insulat
ing at low temperatures and ambient pressure and enters a ferrimagneti
clike state below 20 K. Under hydrostatic pressure (p congruent-to 300
bar), previous investigations have shown that the metallic state can
be stabilized and that reentrant superconducting behavior can be obser
ved (by means of resistivity measurements) in a rather wide pressure r
ange. By means of dc susceptibility measurements, we show that reentra
nt volume superconductivity actually exists only in a narrow critical
pressure range. In contrast to previously found reentrant superconduct
ors, this material does not contain rare-earth magnetic moments.