A study of structure, electric and magnetic properties of the new layered cobalt oxides Sr2Y1-xCaxCo2O7-z

被引：1
作者：
Yamaura, K [1 ]
Huang, Q
Erwin, RW
Lynn, JW
Cava, RJ
机构：
[1] Princeton Univ, Dept Chem, Princeton, NJ 08540 USA
[2] Princeton Univ, Princeton Mat Inst, Princeton, NJ 08540 USA
[3] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
[4] Univ Maryland, Dept Mat & Nucl Engn, College Pk, MD 20742 USA
来源：
JOURNAL OF LOW TEMPERATURE PHYSICS | 1999年 / 117卷 / 3-4期
关键词：
Oxide; Crystal Structure; Cobalt; Magnetic Property; Magnetic Susceptibility;
D O I：
10.1023/A:1022534420416
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The crystal structure of Sr2Y0.8Ca0.2Co2O6 is orthorhombic below 270 K (Immm, a = 3.84029(7) Angstrom, b = 3.80691(6) Angstrom and c = 19.4980(3) Angstrom at 20 K), transformed from tetragonal (I4/mmm, a = 3.82765(6) Angstrom and c = 19.5795(3) Angstrom) at 295 K. The crystal structure distortion is accompanied by an anomalous temperature dependence of the degree of buckling of the CoO2 plane and is correlated with the development of anisotropic antiferromagnetic ordering of magnetic moments (2.93(2) mu(B) per Co at 20 K). A magnetically glassy state below about 35 K and variable range hopping conduction below about 64 K for Sr2Y1-xCaxCo23.4+O7-z (0.2 less than or equal to x less than or equal to 0.5, 0.21 less than or equal to z less than or equal to 0.38) were found by magnetic susceptibility and electrical resistivity measurements.
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页码：849 / 853
页数：5
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