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Quantum melting of the quasi-two-dimensional vortex lattice in kappa-(ET)2Cu(NCS)2

M. M. Mola·S. Hill·J. S. Brooks·J. S. Qualls
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Abstract

We report torque magnetization measurements in regions of the mixed state phase diagram (${\bf B}\simμ_o{\bf H}_{c2}$ and T$_c$/$10^3$) of the organic superconductor $κ-$(ET)$_2$Cu(NCS)$_2$ where quantum fluctuations are expected to dominate thermal effects. Over most of the field range below the irreversibility line (${\bf B}_{irr}$), magneto-thermal instabilities are observed in the form of flux jumps. The abrupt cessation of these instabilities just below ${\bf B}_{irr}$ indicates a quantum melting transition from a quasi-two-dimensional vortex lattice phase to a quantum liquid phase.

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M. M. Mola, S. Hill, J. S. Brooks, J. S. Qualls. 2001-01-26. Quantum melting of the quasi-two-dimensional vortex lattice in kappa-(ET)2Cu(NCS)2. https://doi.org/10.1103/physrevlett.86.2130

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