https://doi.org/10.1007/BF01315688
Effect of Cu doping at the Mn site on the transport and magnetic behaviors of La2/3Ca1/3MnO3
Department of Physics, Huazhong University of Science and
Technology, Wuhan 430074, PR China
Corresponding author: a yuansl@hust.edu.cn
Received:
9
August
2000
Revised:
14
November
2000
Published online: 15 March 2001
We show that the replacement of Mn with Cu, without any structure change,
strongly affects the transport and magnetic behaviors in La2/3Ca1/3
Mn
CuxO
(
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 
, and further doping to
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 
and 
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.
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.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
