Anomalous vortex dynamics in κ-[bis(ethylenedithio)tetrathiafulvalene]2Cu[N(CN)2]Br: Evidence for field-induced magnetic order and unconventional superconductivity
U. G. L. Lahaise, Qun Chen, L. E. De Long, C. P. Brock, H. H. Wang, K. D. Carlson, J. A. Schlueter, J. M. Williams
DOI 10.1103/PhysRevB.51.3301 · Physical Review B
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Abstract
Anisotropic superconducting flux-line behavior of single-crystal κ-[bis(ethylenedithio)tetrathiaful- valene]2Cu[N(CN)2]Br has been studied with dc magnetization and vibrating-reed (VR) techniques. A peak at T*(H) in the temperature dependence of the VR inverse quality factor 1/Q exhibits a shoulder for magnetic fields 0<μ0H≤0.5 T parallel to the conducting ac plane. The shoulder becomes unresolved near a kink in T*(H) at μ0H≊0.7 T. Discontinuities in 1/Q and the VR frequency shift occur for 0.1≤μ0H≤1.3 T applied perpendicular to the ac plane and temperatures T≤20 K, well into the normal state. These anomalies are preliminary evidence for a field-induced magnetic phase transition and unconventional superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(ET)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.6 | Pressure not reported | unknown |
| κ-(ET)2Cu[N(CN)2]Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.6 | Pressure not reported | unknown |
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