Superconducting volume fraction in overdoped regime of La2-xSrxCuO4:: Implication for phase separation from magnetic-susceptibility measurement

被引：60

作者：

Tanabe, Y ^{[1
]}

Adachi, T ^{[1
]}

Noji, T ^{[1
]}

Koike, Y ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2005年 / 74卷 / 11期

关键词：

phase separation; La2-xSrxCuO4; magnetic susceptibility; Sr-concentration-gradient single crystal; superconducting volume fraction;

D O I：

10.1143/JPSJ.74.2893

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have grown a single crystal of Lag(2-x)Sr(x)CuO(4) in which the Sr concentration, x, continuously changes from 0.24 to 0.29 in the overdoped regime and obtained many pieces of single crystals with different x values by slicing the single crystal. From detailed measurements of the magnetic susceptibility, chi, of each piece, it has been found that the absolute value of chi at the measured lowest temperature 2K, vertical bar chi(2K)vertical bar, on field cooling rapidly decreases with increasing x as well as the superconducting (SC) transition temperature. As the value of vertical bar chi(2K)vertical bar is regarded as corresponding to the SC volume fraction in a sample, it has been concluded that a phase separation into SC and normal-state regions occurs in a sample of La2-xSrxCuO4 in the overdoped regime.

引用

页码：2893 / 2896

页数：4

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