Magnetic-susceptibility and specific-heat studies on the inhomogeneity of superconductivity in the underdoped La2-x SrxCuO 4

Tadashi Adachi; Keisuke Omori; Yoichi Tanabe; Yoji Koike

doi:10.1143/JPSJ.78.114707

Magnetic-susceptibility and specific-heat studies on the inhomogeneity of superconductivity in the underdoped La_2-x Sr_xCuO ₄

Tadashi Adachi, Keisuke Omori, Yoichi Tanabe, Yoji Koike

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

9 Citations (Scopus)

Abstract

The possible inhomogeneity of superconductivity has been investigated by means of bulk-sensitive probes, using La_2-xSr_xCuO ₄ (LSCO) single crystals from the underdoped to optimally doped regime. Measurements of the magnetic susceptibility, x, on field cooling and specific heat have revealed that both the absolute value of x at 2 K, regarded as corresponding to the superconducting (SC) volume fraction in a sample, and the Sommerfeld constant, reflecting the density of states of quasiparticles at the Fermi level, exhibit significant dependence on x, namely, on the hole concentration. This is the first experimental work strongly suggesting that a phase separation into SC and normal-state regions takes place in the underodped regime of LSCO as well as in the overdoped regime.

Original language	English
Article number	114707
Journal	journal of the physical society of japan
Volume	78
Issue number	11
DOIs	https://doi.org/10.1143/JPSJ.78.114707
Publication status	Published - 2009 Nov
Externally published	Yes

Keywords

LaSrCUo
Magnetic susceptibility
Phase separation
Sommerfeld constant
Specific heat
Superconducting volume fraction

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.78.114707

Cite this

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title = "Magnetic-susceptibility and specific-heat studies on the inhomogeneity of superconductivity in the underdoped La2-x SrxCuO 4",

abstract = "The possible inhomogeneity of superconductivity has been investigated by means of bulk-sensitive probes, using La2-xSrxCuO 4 (LSCO) single crystals from the underdoped to optimally doped regime. Measurements of the magnetic susceptibility, x, on field cooling and specific heat have revealed that both the absolute value of x at 2 K, regarded as corresponding to the superconducting (SC) volume fraction in a sample, and the Sommerfeld constant, reflecting the density of states of quasiparticles at the Fermi level, exhibit significant dependence on x, namely, on the hole concentration. This is the first experimental work strongly suggesting that a phase separation into SC and normal-state regions takes place in the underodped regime of LSCO as well as in the overdoped regime.",

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AU - Koike, Yoji

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AB - The possible inhomogeneity of superconductivity has been investigated by means of bulk-sensitive probes, using La2-xSrxCuO 4 (LSCO) single crystals from the underdoped to optimally doped regime. Measurements of the magnetic susceptibility, x, on field cooling and specific heat have revealed that both the absolute value of x at 2 K, regarded as corresponding to the superconducting (SC) volume fraction in a sample, and the Sommerfeld constant, reflecting the density of states of quasiparticles at the Fermi level, exhibit significant dependence on x, namely, on the hole concentration. This is the first experimental work strongly suggesting that a phase separation into SC and normal-state regions takes place in the underodped regime of LSCO as well as in the overdoped regime.

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