Low-temperature behavior of YBaCo2O5.5:: Coexistence of two spin-state ordered phases

被引：15

作者：

Khalyavin, D. D. ^{[1
]}

Argyriou, D. N. ^{[2
]}

Amann, U. ^{[2
]}

Yaremchenko, A. A. ^{[3
]}

Kharton, V. V. ^{[3
]}

机构：

[1] Natl Acad Sci, Inst Solid State & Semicond Phys, Minsk 220072, BELARUS

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

[3] Univ Aveiro, CICECO, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.77.064419

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The low temperature antiferromagnetic-antiferromagnetic phase transition in polycrystalline YBaCo2O5.5 cobaltite was studied by neutron powder diffraction. On the basis of symmetry arguments in combination with Rietveld refinement, the coexistence of two phases with different type of spin-state ordering between the diamagnetic (t(2g)(6)e(g)(0), S=0) and paramagnetic (t(2g)(4)e(g)(2), S=2) sixfold coordinated Co3+ cations was revealed below the transformation temperature, T-L similar to 195 K. One of the phases having Pmma (2a(p)x2a(p)x2a(p)) symmetry is characteristic of the high-temperature (T>T-L) homogeneous state, whilst another with Bmmm (2a(p)x2a(p)x4a(p)) symmetry involves another type of spin-state ordered superstructure. The conjugated magnetic structures possess k=c(*)/2 and k=0 wave vectors, respectively. The structural changes are driven by competition between the elastic and exchange energies.

引用

页数：6

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