Paramagnetic limiting of the upper critical field of the layered organic superconductor $\kappa -(BEDT-TTF{)}_{2}Cu(SCN{)}_2$

Abstract

We report detailed measurements of the interlayer magnetoresistance of the layered organic superconductor $\kappa -(BEDT-TTF{)}_{2}Cu(SCN{)}_2$ for temperatures down to 0.5 K and fields up to 30 tesla. The upper critical field is determined from the resistive transition for a wide range of temperatures and field directions. For magnetic fields parallel to the layers, the upper critical field increases approximately linearly with decreasing temperature. The upper critical field at low temperatures is compared to the Pauli paramagnetic limit, at which singlet superconductivity should be destroyed by the Zeeman splitting of the electron spins. The measured value is comparable to a value for the paramagnetic limit calculated from thermodynamic quantities but exceeds the limit calculated from BCS theory. The angular dependence of the upper critical field shows a cusp-like feature for fields close to the layers, consistent with decoupled layers.

16 pages 5 figures

References in corpus (9)

• Similarities between organic and cuprate superconductors
• Pairing due to Spin Fluctuations in Layered Organic Superconductors
• Phase Diagram of Superconductivity on the Anisotropic Triangular Lattice Hubbard Model
• Spin Fluctuation-Induced Superconductivity in Organic Compounds
• Response of a $d_{x^2-y^2}$ Superconductor to a Zeeman Magnetic Field
• Indications of Unconventional Superconductivity in Doped and Undoped Triangular Antiferromagnets
• Heat Conduction in $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Spin wave analysis to the spatially-anisotropic Heisenberg antiferromagnet on triangular lattice
• Larkin-Ovchinnikov-Fulde-Ferrell state in quasi-one-dimensional superconductors

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