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

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

2000-08-17

arxiv.org/abs/cond-mat/0008262v2

Physics

Condensed Matter

Superconductivity

8 pages (inc. Figs), accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.2130

We report torque magnetization measurements in regions of the mixed state phase diagram (${\bf B}\sim\mu_o{\bf H}_{c2}$ and T$_c$/$10^3$) of the organic superconductor $\kappa-$(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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