Anisotropic magnetic, magnetoresistance, and electrotransport properties of GdBaCo2O5.5 single crystals -: art. no. 214421

被引:73
作者
Khalyavin, DD
Barilo, SN
Shiryaev, SV
Bychkov, GL
Troyanchuk, IO
Furrer, A
Allenspach, P
Szymczak, H
Szymczak, R
机构
[1] Natl Acad Sci, Inst Solid State & Semicond Phys, Minsk 220072, BELARUS
[2] ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
[3] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[4] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
关键词
D O I
10.1103/PhysRevB.67.214421
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Single crystals of GdBaCo2O5.5 layered perovskites have been grown from a flux melt of Gd2O3-BaO-CoO oxides. Magnetic data showed that the GdBaCo2O5.5 single crystals exhibit a magnetic phase transition from an antiferromagnetic state to a ferromagnetic one with spontaneous magnetization around 0.41 mu(B) per Co ion at T(i)similar to160 K. Direction of spontaneous magnetic moment coincides with either the a or b axis. It is assumed that Co3+ ions adopt low- and intermediate-spin states in the ratio of 1:1. The giant magnetoresistance effect connected closely with a spontaneous magnetization appearance shows a strong anisotropic that is behavior consistent with the anisotropy of magnetic properties. On the basis of electrical resistivity data the quasi-two-dimensional character of conductivity, above the metal-insulator transition temperature T(MI)similar to370 K, was assumed.
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