Stretched exponential spin relaxation in organic superconductors

Joseph Gezo; Tak Kei Lui; Brian Wolin; Charles P. Slichter; Russell Giannetta; John A. Schlueter

doi:10.1103/PhysRevB.88.140504

Stretched exponential spin relaxation in organic superconductors

Joseph Gezo
, Tak Kei Lui
, Brian Wolin
, Charles P. Slichter
, Russell Giannetta
, John A. Schlueter

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Proton NMR measurements on the organic superconductor κ-(ET) ₂Cu[N(CN)₂]Br [where ET represents bis(ethylenedithio) tetrathiafulvalene] T_C=11.6K exhibit stretched exponential spin-lattice relaxation below T≈25K, suggestive of an inhomogeneous magnetic phase that develops in the normal state and coexists with superconductivity. The onset of this phase coincides approximately with a large normal-state Nernst signal reported previously. By contrast, the closely related superconductor κ-(ET)₂Cu(NCS)₂ T_C=10.5K shows single exponential spin-lattice relaxation and a conventional Nernst effect. The temperature range of T_C < T < 30 K encompasses several phenomena in the κ-(ET)₂X conductors, including changes in conduction-electron-spin resonance, electronic phase separation, and the onset of antiferromagnetic order. Analogous behavior in La_2-xSr _xCuO₄ suggests that a spin glass or density wave may develop in κ-(ET)₂Cu[N(CN)₂]Br.

Original language	English (US)
Article number	140504
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	88
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.88.140504
State	Published - Oct 14 2013

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.88.140504

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title = "Stretched exponential spin relaxation in organic superconductors",

abstract = "Proton NMR measurements on the organic superconductor κ-(ET) 2Cu[N(CN)2]Br [where ET represents bis(ethylenedithio) tetrathiafulvalene] TC=11.6K exhibit stretched exponential spin-lattice relaxation below T≈25K, suggestive of an inhomogeneous magnetic phase that develops in the normal state and coexists with superconductivity. The onset of this phase coincides approximately with a large normal-state Nernst signal reported previously. By contrast, the closely related superconductor κ-(ET)2Cu(NCS)2 TC=10.5K shows single exponential spin-lattice relaxation and a conventional Nernst effect. The temperature range of TC < T < 30 K encompasses several phenomena in the κ-(ET)2X conductors, including changes in conduction-electron-spin resonance, electronic phase separation, and the onset of antiferromagnetic order. Analogous behavior in La2-xSr xCuO4 suggests that a spin glass or density wave may develop in κ-(ET)2Cu[N(CN)2]Br.",

author = "Joseph Gezo and Lui, \{Tak Kei\} and Brian Wolin and Slichter, \{Charles P.\} and Russell Giannetta and Schlueter, \{John A.\}",

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doi = "10.1103/PhysRevB.88.140504",

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AU - Gezo, Joseph

AU - Lui, Tak Kei

AU - Wolin, Brian

AU - Slichter, Charles P.

AU - Giannetta, Russell

AU - Schlueter, John A.

PY - 2013/10/14

Y1 - 2013/10/14

N2 - Proton NMR measurements on the organic superconductor κ-(ET) 2Cu[N(CN)2]Br [where ET represents bis(ethylenedithio) tetrathiafulvalene] TC=11.6K exhibit stretched exponential spin-lattice relaxation below T≈25K, suggestive of an inhomogeneous magnetic phase that develops in the normal state and coexists with superconductivity. The onset of this phase coincides approximately with a large normal-state Nernst signal reported previously. By contrast, the closely related superconductor κ-(ET)2Cu(NCS)2 TC=10.5K shows single exponential spin-lattice relaxation and a conventional Nernst effect. The temperature range of TC < T < 30 K encompasses several phenomena in the κ-(ET)2X conductors, including changes in conduction-electron-spin resonance, electronic phase separation, and the onset of antiferromagnetic order. Analogous behavior in La2-xSr xCuO4 suggests that a spin glass or density wave may develop in κ-(ET)2Cu[N(CN)2]Br.

AB - Proton NMR measurements on the organic superconductor κ-(ET) 2Cu[N(CN)2]Br [where ET represents bis(ethylenedithio) tetrathiafulvalene] TC=11.6K exhibit stretched exponential spin-lattice relaxation below T≈25K, suggestive of an inhomogeneous magnetic phase that develops in the normal state and coexists with superconductivity. The onset of this phase coincides approximately with a large normal-state Nernst signal reported previously. By contrast, the closely related superconductor κ-(ET)2Cu(NCS)2 TC=10.5K shows single exponential spin-lattice relaxation and a conventional Nernst effect. The temperature range of TC < T < 30 K encompasses several phenomena in the κ-(ET)2X conductors, including changes in conduction-electron-spin resonance, electronic phase separation, and the onset of antiferromagnetic order. Analogous behavior in La2-xSr xCuO4 suggests that a spin glass or density wave may develop in κ-(ET)2Cu[N(CN)2]Br.

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Stretched exponential spin relaxation in organic superconductors

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