Effect of Cu doping at the Mn site on the transport aaand magnetic behaviors of La 2/3 Ca 1/3 MnO3
Yuan, S.L. ; Li, Z.Y. ; Zeng, X.Y. ; Zhang, G.Q. ; Tu, F. ; Peng, G. ; Liu, J. ; Yang, Y.P. ; Tang, C.Q.
Springer
Published 2001
Springer
Published 2001
ISSN: |
1434-6036
|
---|---|
Keywords: |
PACS. 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.)
|
Source: |
Springer Online Journal Archives 1860-2000
|
Topics: |
Physics
|
Notes: |
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.
|
Type of Medium: |
Electronic Resource
|
URL: |