MAGNETIC-SUSCEPTIBILITY OF NORMAL STATE AND SUPERCONDUCTIVITY OF LA2-XSRXCUO4

被引：51

作者：

YOSHIZAKI, R ^{[1
]}

ISHIKAWA, N ^{[1
]}

SAWADA, H ^{[1
]}

KITA, E ^{[1
]}

TASAKI, A ^{[1
]}

机构：

[1] UNIV TSUKUBA,CTR CRYOGEN,SAKURA,IBARAKI 305,JAPAN

来源：

PHYSICA C | 1990年 / 166卷 / 5-6期

关键词：

D O I：

10.1016/0921-4534(90)90038-G

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The two-dimensional spin-correlation energy, J, was studied in La2-xSrxCuO4 by means of magnetic susceptibility measurements .We found that J, deduced from the susceptibility peak temperature, Tmax, changed drastically with the character of the doped holes, localized or itinerant. In the low carrier density region (0≦x≦0.08), J was higher than 1000 K, representing the nearest neighbor interaction due to the localization of holes. A sudden drop of J and the appearance of bulk superconductivity were observed at x=0.09, which was ascribed to the itinerant holes. The Zn substitution effect for Cu was investigated near the superconductor-to-normal-metal transition. We found that only 1% Zn substitution resulted in 30% decrease of both Tc and Tmax, and Tmax disappeared as Tc became zero. Those results give us direct evidence that the spin correlation relates to the appearance of the superconductivity. © 1990.

引用

页码：417 / 422

页数：6

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