Comparison of the normal-state properties of κ-(BEDT-TTF)2Cu(NCS)2 and its deuterated analogue in high magnetic fields and under high hydrostatic pressures

Tim Biggs; Anne Katrin Klehe; John Singleton; David Bakker; Jane Symington; Paul Goddard; Arzhang Ardavan; William Hayes; John A. Schlueter; Takehiko Sasaki; Mohamedally Kurmoo

doi:10.1088/0953-8984/14/26/102

Comparison of the normal-state properties of κ-(BEDT-TTF)₂Cu(NCS)₂ and its deuterated analogue in high magnetic fields and under high hydrostatic pressures

Tim Biggs, Anne Katrin Klehe, John Singleton, David Bakker, Jane Symington, Paul Goddard, Arzhang Ardavan, William Hayes, John A. Schlueter, Takehiko Sasaki, Mohamedally Kurmoo

IMR - Materials Property Division

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

28 Citations (Scopus)

Abstract

Details of the Fermi-surface topology of deuterated κ(BEDT-TFF)₂Cu(NCS)₂ (where BEDT-TTF ≡ bis(ethylene-dithio)tetrathiafulvalene) have been measured as a function of pressure, and compared with equivalent measurements of the undeuterated salt. We find that the superconducting transition temperature is much more dramatically suppressed by increasing pressure in the deuterated salt. It is suggested that this is linked to pressure-induced changes in the Fermi-surface topology, which occur more rapidly in the deuterated salt than in the undeuterated salt as the pressure is raised. Our data suggest that the negative isotope effect observed on deuteration is due to small differences in Fermi-surface topology caused by the isotopic substitution.

Original language	English
Pages (from-to)	L495-L502
Journal	Journal of Physics Condensed Matter
Volume	14
Issue number	26
DOIs	https://doi.org/10.1088/0953-8984/14/26/102
Publication status	Published - 2002 Jul 8

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Biggs, T., Klehe, A. K., Singleton, J., Bakker, D., Symington, J., Goddard, P., Ardavan, A., Hayes, W., Schlueter, J. A., Sasaki, T., & Kurmoo, M. (2002). Comparison of the normal-state properties of κ-(BEDT-TTF)₂Cu(NCS)₂ and its deuterated analogue in high magnetic fields and under high hydrostatic pressures. Journal of Physics Condensed Matter, 14(26), L495-L502. https://doi.org/10.1088/0953-8984/14/26/102

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title = "Comparison of the normal-state properties of κ-(BEDT-TTF)2Cu(NCS)2 and its deuterated analogue in high magnetic fields and under high hydrostatic pressures",

abstract = "Details of the Fermi-surface topology of deuterated κ(BEDT-TFF)2Cu(NCS)2 (where BEDT-TTF ≡ bis(ethylene-dithio)tetrathiafulvalene) have been measured as a function of pressure, and compared with equivalent measurements of the undeuterated salt. We find that the superconducting transition temperature is much more dramatically suppressed by increasing pressure in the deuterated salt. It is suggested that this is linked to pressure-induced changes in the Fermi-surface topology, which occur more rapidly in the deuterated salt than in the undeuterated salt as the pressure is raised. Our data suggest that the negative isotope effect observed on deuteration is due to small differences in Fermi-surface topology caused by the isotopic substitution.",

author = "Tim Biggs and Klehe, {Anne Katrin} and John Singleton and David Bakker and Jane Symington and Paul Goddard and Arzhang Ardavan and William Hayes and Schlueter, {John A.} and Takehiko Sasaki and Mohamedally Kurmoo",

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Biggs, T, Klehe, AK, Singleton, J, Bakker, D, Symington, J, Goddard, P, Ardavan, A, Hayes, W, Schlueter, JA, Sasaki, T & Kurmoo, M 2002, 'Comparison of the normal-state properties of κ-(BEDT-TTF)₂Cu(NCS)₂ and its deuterated analogue in high magnetic fields and under high hydrostatic pressures', Journal of Physics Condensed Matter, vol. 14, no. 26, pp. L495-L502. https://doi.org/10.1088/0953-8984/14/26/102

TY - JOUR

T1 - Comparison of the normal-state properties of κ-(BEDT-TTF)2Cu(NCS)2 and its deuterated analogue in high magnetic fields and under high hydrostatic pressures

AU - Biggs, Tim

AU - Klehe, Anne Katrin

AU - Singleton, John

AU - Bakker, David

AU - Symington, Jane

AU - Goddard, Paul

AU - Ardavan, Arzhang

AU - Hayes, William

AU - Schlueter, John A.

AU - Sasaki, Takehiko

AU - Kurmoo, Mohamedally

PY - 2002/7/8

Y1 - 2002/7/8

N2 - Details of the Fermi-surface topology of deuterated κ(BEDT-TFF)2Cu(NCS)2 (where BEDT-TTF ≡ bis(ethylene-dithio)tetrathiafulvalene) have been measured as a function of pressure, and compared with equivalent measurements of the undeuterated salt. We find that the superconducting transition temperature is much more dramatically suppressed by increasing pressure in the deuterated salt. It is suggested that this is linked to pressure-induced changes in the Fermi-surface topology, which occur more rapidly in the deuterated salt than in the undeuterated salt as the pressure is raised. Our data suggest that the negative isotope effect observed on deuteration is due to small differences in Fermi-surface topology caused by the isotopic substitution.

AB - Details of the Fermi-surface topology of deuterated κ(BEDT-TFF)2Cu(NCS)2 (where BEDT-TTF ≡ bis(ethylene-dithio)tetrathiafulvalene) have been measured as a function of pressure, and compared with equivalent measurements of the undeuterated salt. We find that the superconducting transition temperature is much more dramatically suppressed by increasing pressure in the deuterated salt. It is suggested that this is linked to pressure-induced changes in the Fermi-surface topology, which occur more rapidly in the deuterated salt than in the undeuterated salt as the pressure is raised. Our data suggest that the negative isotope effect observed on deuteration is due to small differences in Fermi-surface topology caused by the isotopic substitution.

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Comparison of the normal-state properties of κ-(BEDT-TTF)₂Cu(NCS)₂ and its deuterated analogue in high magnetic fields and under high hydrostatic pressures

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