High pressure induced spin state crossover in Sr2CaYCo4O10.5

被引：4

作者：

Sikolenko, V. ^{[1
]}

Troyanchuk, I. ^{[2
]}

Bushinsky, M. ^{[2
]}

Efimov, V. ^{[3
]}

Keller, L. ^{[4
]}

White, J. S. ^{[4
,5
]}

Schilling, F. R. ^{[6
]}

Schorr, S. ^{[1
]}

机构：

[1] Helmholtz Zentrum Berlin, D-14109 Berlin, Germany

[2] NAS Belarus, Scientifical Pract Mat Sci Ctr, Minsk 220072, BELARUS

[3] Joint Inst Nucl Res, Dubna 141980, Russia

[4] Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland

[5] Ecole Polytech Fed Lausanne, Lab Quantum Magnetism, CH-1015 Lausanne, Switzerland

[6] Karlsruhe Inst Technol, Inst Appl Geosci, D-76131 Karlsruhe, Germany

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2015年 / 27卷 / 04期

基金：

俄罗斯基础研究基金会;

关键词：

neutron diffraction; high pressure; spin state; TRANSITION;

D O I：

10.1088/0953-8984/27/4/046005

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The layered cobaltite Sr2CaYCo4O10.5 with formal average cobalt oxidation state close to 3+ has been studied as functions of both temperature and pressure up to 4GPa by neutron powder diffraction (NPD). The crystal structure is shown to have tetragonal symmetry (space group I4/mmm; 2a(p) x 2a(p) x 4a(p) superstructure), and the magnetic structure at ambient pressure is found to be G-type antiferromagnetic with T-N close to 310 K. The magnetic moments within the CoO6 octahedral layers and anion-deficient CoO4.5 layers are 1.2 mu(B) and 2.8 mu(B), respectively. At 25K, and applied pressure of 3.5 GPa is sufficient to completely suppress a long-range magnetic order. This result is interpreted in terms of a pressure-induced high-to-low spin state crossover of the Co3+ ions.

引用

页数：5

共 24 条

[1] Origin of the Room-Temperature Ferromagnetism in Sr3YCo4O10+δ (0.5 < δ < 1.0): Formation of Ferromagnetic Spin Bags in the Oxygen-Rich Perovskite Layers [J].