Evidence for a vortex-lattice melting transition in an organic superconductor

L. Fruchter; A. Aburto; C. Pham-Phu

doi:10.1103/PhysRevB.56.R2936

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Evidence for a vortex-lattice melting transition in an organic superconductor

L. Fruchter, A. Aburto, C. Pham-Phu

DOI 10.1103/PhysRevB.56.R2936 · Physical Review B

T1

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Abstract

We have observed a step in the equilibrium magnetization for the organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Br characteristic of a transition of the flux-line solid to a liquid of flux lines. The entropy variation at the transition is found larger than that expected from the theory of the flux-line lattice melting in an anisotropic superconductor. We interpret the decrease of the magnetization step magnitude upon a more rapid cooling of the material to be the consequence of the creation of some strong pins.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
κ-(BEDT-TTF)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.3	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
Bi2Sr2CaCu2O8x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.5	Pressure not reported	unknown