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

Abstract

We report torque magnetization measurements in regions of the mixed state phase diagram ($\mathbf{B}\sim {\mu }_o{\mathbf{H}}_{c2}$ 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 (${\mathbf{B}}_{irr}$), magneto-thermal instabilities are observed in the form of flux jumps. The abrupt cessation of these instabilities just below ${\mathbf{B}}_{irr}$ indicates a quantum melting transition from a quasi-two-dimensional vortex lattice phase to a quantum liquid phase.

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

References in corpus (4)

• Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in the quasi-two-dimensional organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Low Temperature Penetration depth of κ-(ET)_2Cu[N(CN)_2]Br and κ-(ET)_2Cu(NCS)_2
• Paramagnetic limiting of the upper critical field of the layered organic superconductor $\kappa -(BEDT-TTF{)}_{2}Cu(SCN{)}_2$
• Josephson plasma resonance in k-(BEDT-TTF)2Cu(NCS)2

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• Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor $\lambda$-(BETS)${}_2$GaCl${}_4$
• An Experimental and Semi-Empirical Method to Determine the Pauli-Limiting Field in Quasi 2D Superconductors as applied to $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$: Strong Evidence of a FFLO State
• Low temperature vortex liquid states induced by quantum fluctuations in the quasi two dimensional organic superconductor kappa-(BEDT-TTF)_{2} Cu(NCS)_{2}
• Extraordinary $\pi$-Electron Superconductivity Emerging from a Quantum Spin Liquid
• Shubnikov - de Haas effect in the quantum vortex liquid state of the organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Suppression of superconductivity by non-magnetic disorder in organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• New method for torque magnetometry using a commercially available membrane-type surface-stress sensor
• Orbital-Induced Crossover of the Fulde-Ferrell-Larkin-Ovchinnikov Phase into Abrikosov-like States
• New insights on frequency combinations and 'forbidden frequencies' in de Haas-van Alphen spectrum of \k{appa}-(ET) 2 Cu(SCN) 2
• Dissipation in the superconducting state of kappa-(BEDT-TTF)2Cu(NCS)2
• Numerical study of vortex system quantum melting