Josephson vortex dynamics and Fulde-Ferrell-Larkin-Ovchinnikov superconductivity in the layered organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3

Shiori Sugiura; Taichi Terashima; Shinya Uji; Syuma Yasuzuka; John A. Schlueter

doi:10.1103/PhysRevB.100.014515

Josephson vortex dynamics and Fulde-Ferrell-Larkin-Ovchinnikov superconductivity in the layered organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3

Shiori Sugiura, Taichi Terashima, Shinya Uji, Syuma Yasuzuka, John A. Schlueter

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

1 Citation (Scopus)

Abstract

Interlayer resistance is reported in a layered organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3 with Tc≈5 K. At 0.7 K in parallel magnetic fields, the interlayer resistance has nonzero values in a wide field region from 2 T to the upper critical field (∼13T), which can be ascribed to the Josephson vortex (JV) dynamics. Significant hysteresis between 2 T and 8 T and a steplike structure between 4 T and 8 T are found, both of which become less evident with increasing temperature. In the second field-derivative curves, successive small dips are observed between 10 T and 12 T, which are ascribed to the commensurability (CM) effect between the JV lattice and the wavelength λFFLO of the order parameter oscillation in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. The CM effect is observed only in nearly parallel fields, showing that the FFLO phase is stabilized only in a limited field angle region. The temperature-field phase diagram and λFFLO values are obtained.

Original language	English
Article number	014515
Journal	Physical Review B
Volume	100
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.100.014515
Publication status	Published - 2019 Jul 17
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.100.014515

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title = "Josephson vortex dynamics and Fulde-Ferrell-Larkin-Ovchinnikov superconductivity in the layered organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3",

abstract = "Interlayer resistance is reported in a layered organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3 with Tc≈5 K. At 0.7 K in parallel magnetic fields, the interlayer resistance has nonzero values in a wide field region from 2 T to the upper critical field (∼13T), which can be ascribed to the Josephson vortex (JV) dynamics. Significant hysteresis between 2 T and 8 T and a steplike structure between 4 T and 8 T are found, both of which become less evident with increasing temperature. In the second field-derivative curves, successive small dips are observed between 10 T and 12 T, which are ascribed to the commensurability (CM) effect between the JV lattice and the wavelength λFFLO of the order parameter oscillation in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. The CM effect is observed only in nearly parallel fields, showing that the FFLO phase is stabilized only in a limited field angle region. The temperature-field phase diagram and λFFLO values are obtained.",

author = "Shiori Sugiura and Taichi Terashima and Shinya Uji and Syuma Yasuzuka and Schlueter, {John A.}",

note = "Funding Information: This work was supported by a Grant-in-Aid for Scientific Research from MEXT, Japan (Grant No. 17H01144). Work at ANL was supported by U. Chicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357. J.A.S. acknowledges support from the Independent Research/Development program while serving at the National Science Foundation. Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

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doi = "10.1103/PhysRevB.100.014515",

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AU - Sugiura, Shiori

AU - Terashima, Taichi

AU - Uji, Shinya

AU - Yasuzuka, Syuma

AU - Schlueter, John A.

N1 - Funding Information: This work was supported by a Grant-in-Aid for Scientific Research from MEXT, Japan (Grant No. 17H01144). Work at ANL was supported by U. Chicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357. J.A.S. acknowledges support from the Independent Research/Development program while serving at the National Science Foundation. Publisher Copyright: © 2019 American Physical Society.

PY - 2019/7/17

Y1 - 2019/7/17

N2 - Interlayer resistance is reported in a layered organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3 with Tc≈5 K. At 0.7 K in parallel magnetic fields, the interlayer resistance has nonzero values in a wide field region from 2 T to the upper critical field (∼13T), which can be ascribed to the Josephson vortex (JV) dynamics. Significant hysteresis between 2 T and 8 T and a steplike structure between 4 T and 8 T are found, both of which become less evident with increasing temperature. In the second field-derivative curves, successive small dips are observed between 10 T and 12 T, which are ascribed to the commensurability (CM) effect between the JV lattice and the wavelength λFFLO of the order parameter oscillation in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. The CM effect is observed only in nearly parallel fields, showing that the FFLO phase is stabilized only in a limited field angle region. The temperature-field phase diagram and λFFLO values are obtained.

AB - Interlayer resistance is reported in a layered organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3 with Tc≈5 K. At 0.7 K in parallel magnetic fields, the interlayer resistance has nonzero values in a wide field region from 2 T to the upper critical field (∼13T), which can be ascribed to the Josephson vortex (JV) dynamics. Significant hysteresis between 2 T and 8 T and a steplike structure between 4 T and 8 T are found, both of which become less evident with increasing temperature. In the second field-derivative curves, successive small dips are observed between 10 T and 12 T, which are ascribed to the commensurability (CM) effect between the JV lattice and the wavelength λFFLO of the order parameter oscillation in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. The CM effect is observed only in nearly parallel fields, showing that the FFLO phase is stabilized only in a limited field angle region. The temperature-field phase diagram and λFFLO values are obtained.

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Josephson vortex dynamics and Fulde-Ferrell-Larkin-Ovchinnikov superconductivity in the layered organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3

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