Dimensional crossover of vortex state and peak effect in magnetization in organic superconductors

Terukazu Nishizaki; Takahiko Sasaki; Tetsuo Fukase; Norio Kobayashi

doi:10.1016/s0379-6779(97)80322-0

Dimensional crossover of vortex state and peak effect in magnetization in organic superconductors

Terukazu Nishizaki, Takahiko Sasaki, Tetsuo Fukase, Norio Kobayashi

Institute for Materials Research (IMR) (institute affiliation only)

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

Abstract

Magnetization measurements on the single crystals of the organic superconductor κ-(BEDT-TTF)₂Cu(NCS)₂ are performed in the magnetic field perpendicular to the conducting layers. We find an anomalous second peak on magnetization curves which is almost independent of the temperature, similar to the case of high-T_c superconductor Bi₂Sr₂CaCu₂O_8+y. The peak field H_p ≃ 150 Oe well coincides with the dimensional crossover field B_cr = φ₀/(γs)². The temperature dependence of the irreversibility field in the quasi two dimensional (2D) region above B_cr is different from those in the three dimensional (3D) region below B_cr. At the 3D region, the irreversibility field is described by H_irr ∝ (1 - t)ⁿ with n = 1.9, however H_irr increases exponentially with 1/T at the 2D region. The dimensionality of the vortex state and the vortex pinning property are discussed.

Original language	English
Pages (from-to)	1497-1498
Number of pages	2
Journal	Synthetic Metals
Volume	85
Issue number	1-3
DOIs	https://doi.org/10.1016/s0379-6779(97)80322-0
Publication status	Published - 1997 Mar 15

Keywords

Magnetic measurements
Organic Superconductors

ASJC Scopus subject areas

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

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title = "Dimensional crossover of vortex state and peak effect in magnetization in organic superconductors",

abstract = "Magnetization measurements on the single crystals of the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 are performed in the magnetic field perpendicular to the conducting layers. We find an anomalous second peak on magnetization curves which is almost independent of the temperature, similar to the case of high-Tc superconductor Bi2Sr2CaCu2O8+y. The peak field Hp ≃ 150 Oe well coincides with the dimensional crossover field Bcr = φ0/(γs)2. The temperature dependence of the irreversibility field in the quasi two dimensional (2D) region above Bcr is different from those in the three dimensional (3D) region below Bcr. At the 3D region, the irreversibility field is described by Hirr ∝ (1 - t)n with n = 1.9, however Hirr increases exponentially with 1/T at the 2D region. The dimensionality of the vortex state and the vortex pinning property are discussed.",

keywords = "Magnetic measurements, Organic Superconductors",

author = "Terukazu Nishizaki and Takahiko Sasaki and Tetsuo Fukase and Norio Kobayashi",

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TY - JOUR

T1 - Dimensional crossover of vortex state and peak effect in magnetization in organic superconductors

AU - Nishizaki, Terukazu

AU - Sasaki, Takahiko

AU - Fukase, Tetsuo

AU - Kobayashi, Norio

PY - 1997/3/15

Y1 - 1997/3/15

N2 - Magnetization measurements on the single crystals of the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 are performed in the magnetic field perpendicular to the conducting layers. We find an anomalous second peak on magnetization curves which is almost independent of the temperature, similar to the case of high-Tc superconductor Bi2Sr2CaCu2O8+y. The peak field Hp ≃ 150 Oe well coincides with the dimensional crossover field Bcr = φ0/(γs)2. The temperature dependence of the irreversibility field in the quasi two dimensional (2D) region above Bcr is different from those in the three dimensional (3D) region below Bcr. At the 3D region, the irreversibility field is described by Hirr ∝ (1 - t)n with n = 1.9, however Hirr increases exponentially with 1/T at the 2D region. The dimensionality of the vortex state and the vortex pinning property are discussed.

AB - Magnetization measurements on the single crystals of the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 are performed in the magnetic field perpendicular to the conducting layers. We find an anomalous second peak on magnetization curves which is almost independent of the temperature, similar to the case of high-Tc superconductor Bi2Sr2CaCu2O8+y. The peak field Hp ≃ 150 Oe well coincides with the dimensional crossover field Bcr = φ0/(γs)2. The temperature dependence of the irreversibility field in the quasi two dimensional (2D) region above Bcr is different from those in the three dimensional (3D) region below Bcr. At the 3D region, the irreversibility field is described by Hirr ∝ (1 - t)n with n = 1.9, however Hirr increases exponentially with 1/T at the 2D region. The dimensionality of the vortex state and the vortex pinning property are discussed.

KW - Magnetic measurements

KW - Organic Superconductors

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JO - Synthetic Metals

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