Magnetic-field-induced enhancement of the vortex pinning in the overdoped regime of La 2-xSr xCuO 4: Relation to the microscopic phase separation

Yoichi Tanabe; Tadashi Adachi; Keisuke Omori; Hidetaka Sato; Takashi Noji; Yoji Koike

doi:10.1143/JPSJ.76.113706

Magnetic-field-induced enhancement of the vortex pinning in the overdoped regime of La _2-xSr _xCuO ₄: Relation to the microscopic phase separation

Yoichi Tanabe, Tadashi Adachi, Keisuke Omori, Hidetaka Sato, Takashi Noji, Yoji Koike

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

24 Citations (Scopus)

Abstract

In order to investigate the inhomogeneity of the superconducting (SC) state in the overdoped high-T _c-cuprates, we have measured the magnetic susceptibility, χ, of La _2-x,Sr _xCuO ₄ (LSCO) single crystals in the overdoped regime in magnetic fields parallel to the c-axis up to 7 T on warming after zero-field cooling. It has been found for x = 0.198 and 0.219 that the temperature dependence of χ in 1 T shows a plateau, that is, χ is almost independent of temperature in a moderate temperature-range in the SC state. Moreover, a so-called second peak in the magnetization curve has markedly appeared in these crystals. These results indicate an anomalous enhancement of the vortex pinning and strongly suggest the occurrence of a microscopic phase separation into SC and normal-state regions in the overdoped high-T _c cuprates.

Original language	English
Article number	113706
Journal	journal of the physical society of japan
Volume	76
Issue number	11
DOIs	https://doi.org/10.1143/JPSJ.76.113706
Publication status	Published - 2007 Nov 1

Keywords

La Sr CuO
Magnetic susceptibility
Phase separation
Second-peak effect

ASJC Scopus subject areas

Physics and Astronomy(all)

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Magnetic-field-induced enhancement of the vortex pinning in the overdoped regime of La _2-xSr _xCuO ₄ : Relation to the microscopic phase separation. / Tanabe, Yoichi; Adachi, Tadashi; Omori, Keisuke; Sato, Hidetaka; Noji, Takashi; Koike, Yoji.

In: journal of the physical society of japan, Vol. 76, No. 11, 113706, 01.11.2007.

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

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title = "Magnetic-field-induced enhancement of the vortex pinning in the overdoped regime of La 2-xSr xCuO 4: Relation to the microscopic phase separation",

abstract = "In order to investigate the inhomogeneity of the superconducting (SC) state in the overdoped high-T c-cuprates, we have measured the magnetic susceptibility, χ, of La 2-x,Sr xCuO 4 (LSCO) single crystals in the overdoped regime in magnetic fields parallel to the c-axis up to 7 T on warming after zero-field cooling. It has been found for x = 0.198 and 0.219 that the temperature dependence of χ in 1 T shows a plateau, that is, χ is almost independent of temperature in a moderate temperature-range in the SC state. Moreover, a so-called second peak in the magnetization curve has markedly appeared in these crystals. These results indicate an anomalous enhancement of the vortex pinning and strongly suggest the occurrence of a microscopic phase separation into SC and normal-state regions in the overdoped high-T c cuprates.",

keywords = "La Sr CuO, Magnetic susceptibility, Phase separation, Second-peak effect",

author = "Yoichi Tanabe and Tadashi Adachi and Keisuke Omori and Hidetaka Sato and Takashi Noji and Yoji Koike",

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T2 - Relation to the microscopic phase separation

AU - Tanabe, Yoichi

AU - Adachi, Tadashi

AU - Omori, Keisuke

AU - Sato, Hidetaka

AU - Noji, Takashi

AU - Koike, Yoji

PY - 2007/11/1

Y1 - 2007/11/1

N2 - In order to investigate the inhomogeneity of the superconducting (SC) state in the overdoped high-T c-cuprates, we have measured the magnetic susceptibility, χ, of La 2-x,Sr xCuO 4 (LSCO) single crystals in the overdoped regime in magnetic fields parallel to the c-axis up to 7 T on warming after zero-field cooling. It has been found for x = 0.198 and 0.219 that the temperature dependence of χ in 1 T shows a plateau, that is, χ is almost independent of temperature in a moderate temperature-range in the SC state. Moreover, a so-called second peak in the magnetization curve has markedly appeared in these crystals. These results indicate an anomalous enhancement of the vortex pinning and strongly suggest the occurrence of a microscopic phase separation into SC and normal-state regions in the overdoped high-T c cuprates.

AB - In order to investigate the inhomogeneity of the superconducting (SC) state in the overdoped high-T c-cuprates, we have measured the magnetic susceptibility, χ, of La 2-x,Sr xCuO 4 (LSCO) single crystals in the overdoped regime in magnetic fields parallel to the c-axis up to 7 T on warming after zero-field cooling. It has been found for x = 0.198 and 0.219 that the temperature dependence of χ in 1 T shows a plateau, that is, χ is almost independent of temperature in a moderate temperature-range in the SC state. Moreover, a so-called second peak in the magnetization curve has markedly appeared in these crystals. These results indicate an anomalous enhancement of the vortex pinning and strongly suggest the occurrence of a microscopic phase separation into SC and normal-state regions in the overdoped high-T c cuprates.

KW - La Sr CuO

KW - Magnetic susceptibility

KW - Phase separation

KW - Second-peak effect

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