POLARIZED NEUTRON-DIFFRACTION STUDY OF A CUCR2SE4 SINGLE-CRYSTAL

被引：49

作者：

YAMASHITA, O ^{[1
]}

YAMAGUCHI, Y ^{[1
]}

NAKATANI, I ^{[1
]}

WATANABE, H ^{[1
]}

MASUMOTO, K ^{[1
]}

机构：

[1] NATL RES INST MET,MEGURO KU,TOKYO 153,JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1979年 / 46卷 / 04期

关键词：

D O I：

10.1143/JPSJ.46.1145

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electronic state of CuCr2Se4 is investigated by means of the polarized neutron diffraction technique. From the measured form factors of copper and chromium atoms, the magnetic moments are determined to be -0.07±0.02 (µB/Cu) and 2.64±0.04 (µB/Cr), respectively. Further, the uniform polarization existent throughout the crystal is estimated to be -0.20±0.11µB per formula unit, using the total moment 5.01±0.01 (µB/CuCr2Se4) obtained from the magnetization measurement. This result which differs from those reported by other authors with neutron diffraction, shows that neither of the ionic configuration models of Cu+[Cr3+Cr4+]Se4 and Cu2+[Cr3+2]Se4 gives a satisfactory explanation of CuCr2Se4, although the former is closer to the experimental data. The form factor of the chromium atom agrees well with the calculated free ion form factor for Cr+, but not for Cr3+, and this fact indicates that the unpaired electron density on the chromium atom is more spread than that for free Cr3+. It is found that 84±16% of the unpaired 3 d electrons occupy t2g orbitals. © 1979, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

引用

页码：1145 / 1152

页数：8

共 21 条

[1]

Alperin H A, 1962, J PHYS SOC JAPAN SB3, V17, P12

[2]

[Anonymous], J PHYS SOC JAPAN SB

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