Phase diagram of organic superconductor κ-(ET)2Cu[N(CN)2]Br as it is seen from isothermal resistance relaxation

M. A. Tanatar; T. Ishiguro; H. Ito; T. Kondo; G. Saito

doi:10.1016/S0379-6779(98)00256-2

Phase diagram of organic superconductor κ-(ET)₂Cu[N(CN)₂]Br as it is seen from isothermal resistance relaxation

M. A. Tanatar, T. Ishiguro, H. Ito, T. Kondo, G. Saito

Research output: Contribution to journal › Conference article › peer-review

5 Citations (Scopus)

Abstract

Phase diagram of κ-(ET)₂Cu[N(CN)₂]Br superconductor was studied by resistance measurements of structural relaxation kinetics and properties of nonequilibrium phases after isochronous annealing. We show, that (1) the activation energy of the lattice relaxation time below 100 K corresponds well to the potential barrier heights for ET molecule conformation; (2) the shape of the diagram corresponds to that of the ethylene ordering phenomena with superstructure formation; (3) the known anomalies of the electronic properties of the salt, namely resistance hump at around 100 K and pseudogap behavior at 60 K correspond to upper and lower hysteresis branches of the ethylene transformation, while the main second order phase transition proceeds at 80 K; (4) the state that comes our of the transformation is not an ordered state, but rather contains superstructure interacting with the Fermi surface and causing its partial destruction. We discuss these findings, together with high superconducting T_C and negative isotope effect as indications of crucial soft lattice contribution to the superconducting properties in organics.

Original language	English
Pages (from-to)	1849-1852
Number of pages	4
Journal	Synthetic Metals
Volume	103
Issue number	1-3
DOIs	https://doi.org/10.1016/S0379-6779(98)00256-2
Publication status	Published - Jun 24 1999
Externally published	Yes
Event	Proceedings of the 1998 International Conference on Science and Technology of Synthetic Metals (ICSM-98) - Montpellier Duration: Jul 12 1998 → Jul 18 1998

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/S0379-6779(98)00256-2

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title = "Phase diagram of organic superconductor κ-(ET)2Cu[N(CN)2]Br as it is seen from isothermal resistance relaxation",

abstract = "Phase diagram of κ-(ET)2Cu[N(CN)2]Br superconductor was studied by resistance measurements of structural relaxation kinetics and properties of nonequilibrium phases after isochronous annealing. We show, that (1) the activation energy of the lattice relaxation time below 100 K corresponds well to the potential barrier heights for ET molecule conformation; (2) the shape of the diagram corresponds to that of the ethylene ordering phenomena with superstructure formation; (3) the known anomalies of the electronic properties of the salt, namely resistance hump at around 100 K and pseudogap behavior at 60 K correspond to upper and lower hysteresis branches of the ethylene transformation, while the main second order phase transition proceeds at 80 K; (4) the state that comes our of the transformation is not an ordered state, but rather contains superstructure interacting with the Fermi surface and causing its partial destruction. We discuss these findings, together with high superconducting TC and negative isotope effect as indications of crucial soft lattice contribution to the superconducting properties in organics.",

author = "Tanatar, {M. A.} and T. Ishiguro and H. Ito and T. Kondo and G. Saito",

note = "Funding Information: The work has been done under support of CREST from Japan Science and Technology Corporation. MA.T. acknowledges support from Japan Society for the Promotion of Science.; Proceedings of the 1998 International Conference on Science and Technology of Synthetic Metals (ICSM-98) ; Conference date: 12-07-1998 Through 18-07-1998",

year = "1999",

month = jun,

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doi = "10.1016/S0379-6779(98)00256-2",

language = "English",

volume = "103",

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TY - JOUR

T1 - Phase diagram of organic superconductor κ-(ET)2Cu[N(CN)2]Br as it is seen from isothermal resistance relaxation

AU - Tanatar, M. A.

AU - Ishiguro, T.

AU - Ito, H.

AU - Kondo, T.

AU - Saito, G.

N1 - Funding Information: The work has been done under support of CREST from Japan Science and Technology Corporation. MA.T. acknowledges support from Japan Society for the Promotion of Science.

PY - 1999/6/24

Y1 - 1999/6/24

N2 - Phase diagram of κ-(ET)2Cu[N(CN)2]Br superconductor was studied by resistance measurements of structural relaxation kinetics and properties of nonequilibrium phases after isochronous annealing. We show, that (1) the activation energy of the lattice relaxation time below 100 K corresponds well to the potential barrier heights for ET molecule conformation; (2) the shape of the diagram corresponds to that of the ethylene ordering phenomena with superstructure formation; (3) the known anomalies of the electronic properties of the salt, namely resistance hump at around 100 K and pseudogap behavior at 60 K correspond to upper and lower hysteresis branches of the ethylene transformation, while the main second order phase transition proceeds at 80 K; (4) the state that comes our of the transformation is not an ordered state, but rather contains superstructure interacting with the Fermi surface and causing its partial destruction. We discuss these findings, together with high superconducting TC and negative isotope effect as indications of crucial soft lattice contribution to the superconducting properties in organics.

AB - Phase diagram of κ-(ET)2Cu[N(CN)2]Br superconductor was studied by resistance measurements of structural relaxation kinetics and properties of nonequilibrium phases after isochronous annealing. We show, that (1) the activation energy of the lattice relaxation time below 100 K corresponds well to the potential barrier heights for ET molecule conformation; (2) the shape of the diagram corresponds to that of the ethylene ordering phenomena with superstructure formation; (3) the known anomalies of the electronic properties of the salt, namely resistance hump at around 100 K and pseudogap behavior at 60 K correspond to upper and lower hysteresis branches of the ethylene transformation, while the main second order phase transition proceeds at 80 K; (4) the state that comes our of the transformation is not an ordered state, but rather contains superstructure interacting with the Fermi surface and causing its partial destruction. We discuss these findings, together with high superconducting TC and negative isotope effect as indications of crucial soft lattice contribution to the superconducting properties in organics.

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U2 - 10.1016/S0379-6779(98)00256-2

DO - 10.1016/S0379-6779(98)00256-2

M3 - Conference article

AN - SCOPUS:0033138282

SN - 0379-6779

VL - 103

SP - 1849

EP - 1852

JO - Synthetic Metals

JF - Synthetic Metals

IS - 1-3

T2 - Proceedings of the 1998 International Conference on Science and Technology of Synthetic Metals (ICSM-98)

Y2 - 12 July 1998 through 18 July 1998

ER -

Phase diagram of organic superconductor κ-(ET)₂Cu[N(CN)₂]Br as it is seen from isothermal resistance relaxation

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