Possible quantum critical point in La2/3Ca1/3Mn1-xGaxO3 -: art. no. 207205

被引：38
作者：
De Teresa, JM [1 ]
Algarabel, PA
Ritter, C
Blasco, J
Ibarra, MR
Morellon, L
Espeso, JI
Gómez-Sal, JC
机构：
[1] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, Zaragoza, Spain
[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[3] Univ Zaragoza, Inst Nanociencia Aragon, Zaragoza, Spain
[4] Univ Cantabria, Dept CITIMAC, E-39005 Santander, Spain
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 20期
关键词：
D O I：
10.1103/PhysRevLett.94.207205
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the magnetic ground state in La2/3Ca1/3Mn1-xGaxO3 manganites, where a quantum critical point (QCP) has been theoretically predicted. The metallic ferromagnetic ground state for low Ga doping breaks down for x >= 0.11, an insulating state being established at low temperatures. Long-range ferromagnetism coexists with short-range magnetic correlations in the concentration range 0.11 <= x <= 0.145 while only the short-range correlations survive for x >= 0.16. We discuss the implications of such a QCP to the physics of manganites and compare to other QCP systems.
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