Effect of Cu doping at the Mn site on the transport aaand magnetic behaviors of La 2/3 Ca 1/3 MnO3

S.L. Yuan (), Z.Y. Li, X.Y. Zeng, G.Q. Zhang, F. Tu, G. Peng, John Liu (), Y. Jiang, Y.P. Yang and C.Q. Tang
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S.L. Yuan: Huazhong University of Science and Technology
Z.Y. Li: Huazhong University of Science and Technology
X.Y. Zeng: Huazhong University of Science and Technology
G.Q. Zhang: Huazhong University of Science and Technology
F. Tu: Huazhong University of Science and Technology
G. Peng: Huazhong University of Science and Technology
Y. Jiang: Huazhong University of Science and Technology
Y.P. Yang: Huazhong University of Science and Technology
C.Q. Tang: Huazhong University of Science and Technology

The European Physical Journal B: Condensed Matter and Complex Systems, 2001, vol. 20, issue 2, 177-181

Abstract: Abstract: We show that the replacement of Mn with Cu, without any structure change, strongly affects the transport and magnetic behaviors in La 2/3 Ca 1/3 Mn1-xCuxO 3 - δ (x ?0.3). Doping largely shifts the insulator-metal transition towards the low-temperature regime and causes substantial enhancements in both resistance and magnetoresistance near the transition for doping range of x ? 15%, and further doping to x ≥ 20% shows insulating behavior. For 15% doping, the sample shows large magnetoresistances (∼104%) over the whole low temperature range. Magnetization measurement at helium temperature reveals that samples for x ? 10% and ≥ 20% basically show ferromagnetic (FM) and antiferromagnetic (AF) behaviors, respectively, while the 15% Cu doped sample undergoes a metamagnetic transition from AF state to FM state on increasing field. We argue that doping introduces the AF insulating phase into the system, causing unusual transport and magnetic behaviors.

Keywords: 75.30.Vn Colossal magnetoresistance; 75.30.Kz Magnetic phase boundaries (including magnetic transitions; metamagnetism; etc.); 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies; synchrotron-source X-ray scattering; etc.) (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/BF01315688

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