Spontaneous and field-induced magnetic transitions in YBaCo2O5.5

被引：8

作者：

Bobrovskii, V. ^{[1
]}

Kazantsev, V. ^{[1
]}

Mirmelstein, A. ^{[1
]}

Mushnikov, N. ^{[1
]}

Proskurnina, N. ^{[1
]}

Voronin, V. ^{[1
]}

Pomjakushina, E. ^{[2
]}

Conder, K. ^{[2
]}

Podlesnyak, A. ^{[3
,4
]}

机构：

[1] Inst Met Phys UB RAS, Ekaterinburg 620041, Russia

[2] PSI, Lab Dev & Methods, CH-5232 Villigen, Switzerland

[3] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany

[4] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2009年 / 321卷 / 05期

基金：

瑞士国家科学基金会;

关键词：

Cobaltite; Metamagnetic transition; Pressure effect; VISCOSITY; STATE; GD;

D O I：

10.1016/j.jmmm.2008.09.030

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A detailed study of magnetic properties of cobaltite YBaCo2O5.5 has been performed in high ( up to 35 T) magnetic fields and under hydrostatic pressure up to 0.8 GPa. The temperatures of paramagnet-ferromagnet (PM-FM) and ferromagnet-antiferromagnet (FM-AF) phase transitions and their pressure derivatives have been determined. It has been revealed that in the compound with yttrium, in contrast to those with magnetic rare earth atoms, the AF-FM field-induced magnetic phase transition is accompanied by a considerable field hysteresis below 240 K, and the magnetic field of 35 T is not sufficient to complete this transition at low temperatures. The hysteresis value depends on the magnetic field sweep rate, which considered as an evidence of magnetic viscosity that is especially strong in the region of coexistence of the FM and AF phases. High values of susceptibility for the field-induced FM phase show that Co spin state in these compounds changes in strong magnetic field. (c) 2008 Elsevier B. V. All rights reserved.

引用

页码：429 / 437

页数：9

共 34 条

[1] Oxygen nonstoichiometry, structures, and physical properties of YBaCo2O5+x (0.00 ≤ x ≤ 0.52) [J].