Anisotropic thermal expansion and effect of pressure on magnetic transition temperatures in chromium chalcogenides Cr3X4 with X = Se and Te
Anisotropic thermal expansion and effect of pressure on magnetic transition temperatures in chromium chalcogenides Cr3X4 with X = Se and Te
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DOI：
10.1016/s0304-8853(96)00315-0
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发表时间：
1996-10
影响因子：
2.7
通讯作者：
S. Ohta;T. Kaneko;H. Yoshida
中科院分区：
文献类型：
--
作者：
S. Ohta;T. Kaneko;H. Yoshida
测量了具有类NiAs晶体结构（空间群为I2/m）的Cr_3X_4（X = Se和Te）的晶格参数a（T），B（T），c（T）和β（T）随温度（T）的变化以及磁转变温度Ttr随压力的变化。对于Cr 3X 4（X → Se和Te），在Ttr以下观察到晶格参数的各向异性热膨胀行为。特别是Cr 3Se 4的α（T）和β（T）在100 K左右加热时表现出突然收缩。Cr_3X_4（X → Se和Te）的Ttr压力导数的符号与体积膨胀行为一致。从谱带图象的观点对所得结果作了定性的讨论。
The lattice parameters a(T), b(T), c(T), and β(T) as a function of temperature (T) and the pressure dependence of the magnetic transition temperature Ttrfor Cr3X4(X Se and Te) with the NiAs-like crystal structure (space group I2/m) have been measured. For Cr3X4(X Se and Te), anisotropic thermal expansion behavior of the lattice parameters is observed below Ttr. In particular, a(T) and β(T) for Cr3Se4exhibit an abrupt contraction on heating at about 100 K. The sign of the pressure derivative of Ttrfor Cr3X4(X Se and Te) is consistent with volumetric expansion behavior. The obtained results are discussed qualitatively from the viewpoint of the band picture.