Pressure-induced antiferromagnet-ferromagnet transition and a change in the spin state of Co in La0.5Ba0.5CoO2.8

被引：5

作者：

Kozlenko, D. P. ^{[1
]}

Rutkauskas, A. V. ^{[1
]}

Dang, N. T. ^{[2
]}

Golosova, N. O. ^{[1
]}

Kichanov, S. E. ^{[1
]}

Dubrovinsky, L. S. ^{[3
]}

Liermann, H. -P. ^{[4
]}

Morgenroth, W. ^{[5
]}

Savenko, B. N. ^{[1
]}

机构：

[1] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia

[2] Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam

[3] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany

[4] DESY, D-22607 Hamburg, Germany

[5] Goethe Univ Frankfurt, Inst Geosci, D-60438 Frankfurt, Germany

来源：

JETP LETTERS | 2014年 / 100卷 / 06期

基金：

俄罗斯基础研究基金会;

关键词：

Magnetic State; High Spin; Spin State; JETP Letter; Ferromagnetic State;

D O I：

10.1134/S0021364014180052

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The crystal and magnetic structures of anion-deficit cobaltite La0.5Ba0.5CoO2.8 have been studied by the X-ray and neutron diffraction methods at high pressures up to 30 and 6 GPa, respectively. A structure transition from the cubic phase with symmetry to the tetragonal phase with symmetry P4/mmm has been observed in this compound at P a parts per thousand 3 GPa. It is accompanied by the change of the ground antiferromagnetic state of the G type to the ferromagnetic state because of a change in the electronic configuration of Co3+ ions. Possible mechanisms of the observed magnetic phase transition, as well as the role of the superexchange interactions between Co3+ ions in various spin states in the formation of magnetic properties, have been discussed. Pressure-induced change in the magnetic state of La0.5Ba0.5CoO2.8 significantly differs from related stoichiometric compounds La(0.5)A(0.5)CoO(3.0) (A = Sr, Ca), where the ground ferromagnetic state is formed and the sign of the pressure dependence of the Curie temperature depends on the element A.

引用

页码：380 / 384

页数：5

共 22 条

[21] Enhancement of superconductivity near the pressure-induced semiconductor-metal transition in the BiS2-based superconductors LnO0.5F0.5BiS2 (Ln = La, Ce, Pr, Nd)
Wolowiec, C. T.
White, B. D.
Jeon, I.
Yazici, D.
Huang, K.
Maple, M. B.
JOURNAL OF PHYSICS-CONDENSED MATTER, 2013, 25 (42)
[22] Universal metastability of the low-spin state in Co2+ systems: Non-Mott type pressure-induced spin-state transition in CoCl2
Kim, Bongjae
Kim, Kyoo
Min, B. I.
PHYSICAL REVIEW B, 2014, 89 (11):

← 1 2 3 →