Pressure-induced electron spin transition in the paramagnetic phase of the GdFe3(BO3)4 Heisenberg magnet

被引：24

作者：

Lyubutin, I. S. ^{[1
]}

Gavriliuk, A. G.

Struzhkin, V. V.

Ovehinnikov, S. G.

Kharlamova, S. A.

Bezmaternykh, L. N.

Hu, M.

Chow, P.

机构：

[1] Russian Acad Sci, Shubnikov Inst Crystallog, Moscow 119333, Russia

[2] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia

[3] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

[4] Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia

[5] Argonne Natl Lab, Argonne, IL 60439 USA

来源：

JETP LETTERS | 2006年 / 84卷 / 09期

基金：

俄罗斯基础研究基金会; 美国国家科学基金会;

关键词：

D O I：

10.1134/S0021364006210119

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The HS -> LS spin crossover effect (high-spin -> low-spin transition) induced by high pressure in the range 45-53 GPa is observed in trivalent Fe3+ ions in the paramagnetic phase of a (GdFe3)-Fe-57(BO3)(4) gadolinium iron borate crystal. This effect is studied in high-pressure diamond-anvil cells by two experimental methods using synchrotron radiation: nuclear resonant forward scattering (NFS) and Fe K-beta high-resolution x-ray emission spectroscopy (YES). The manifestation of the crossover in the paramagnetic phase, which has no order parameter to distinguish between the HS and LS states, correlates with the optical-gap jump and with the insulator-semiconductor transition in the crystal. Based on a theoretical many-electron model, an explanation of this effect at high pressures is proposed.

引用

页码：518 / 523

页数：6

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