Effect of field-induced magnetic ordering on the electrical resistance of the frustrated magnet Au80Co20

被引:2
|
作者
Coïsson, M
Selvaggini, V
Bosco, E
机构
[1] Ist Elettrotecnico Nazl Galileo Ferraris, I-10135 Turin, Italy
[2] INFM, UdR TO Poli, I-10135 Turin, Italy
[3] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy
[4] INFM, UdR TO Poli, I-10129 Turin, Italy
[5] Univ Turin, Dipartimento Chim, IFM, I-10125 Turin, Italy
[6] Univ Turin, INFM, UdR, I-10125 Turin, Italy
关键词
magnetoresistance; magnetic frustration; disordered magnetic systems;
D O I
10.1016/S0304-8853(03)00022-2
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Au80Co20 platelets were produced by solid-state quenching followed by furnace annealing and characterized by X-ray diffraction. Magnetization and magnetoresistance (MR) were measured from 2 to 265 K. Minima of the zero-field electrical resistance R-0(T) were observed at low temperatures (T(m)approximate to20 K) in both as-quenched and annealed samples. These minima disappear upon applying a magnetic field. At low T, a negative MR is associated to strong frustration and a very short magnetic coherence length; at higher temperatures, a positive MR is also observed. (C) 2003 Published by Elsevier Science B.V.
引用
收藏
页码:73 / 77
页数:5
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