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.
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页数：5
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