Anomalous crystal-structure distortion at the antiferromagnetic transition in the layered cobalt oxide Sr2Y0.8Ca0.2Co2O6

K. Yamaura; Q. Huang; R. W. Erwin; J. W. Lynn; R. J. Cava

doi:10.1103/PhysRevB.60.9623

Anomalous crystal-structure distortion at the antiferromagnetic transition in the layered cobalt oxide Sr₂Y_0.8Ca_0.2Co₂O₆

K. Yamaura, Q. Huang, R. W. Erwin, J. W. Lynn, R. J. Cava

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Abstract

The temperature-dependent crystal structure and magnetic structure of the layered Ruddlesden-Popper phase Sr₂Y_0.8Ca_0.2Co₂O₆are reported. The crystal structure is orthorhombic below 270 K [Immm; a=3.84029(7)Å, b=3.80691(6)Å, and c=19.4980(3)Å at 20 K], transformed from tetragonal [I4/mmm; a=3.82765(6)Å, and c=19.5795(3)Å at 295 K]. The crystal structure distortion is accompanied by an anomalous temperature dependence of the degree of buckling of the CoO₂plane and is correlated with the development of anisotropic antiferromagnetic ordering of magnetic moments [2.93(2)μ_Bper Co at 20 K].

Original language	English (US)
Pages (from-to)	9623-9629
Number of pages	7
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	60
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.60.9623
State	Published - 1999

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.60.9623

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title = "Anomalous crystal-structure distortion at the antiferromagnetic transition in the layered cobalt oxide Sr2Y0.8Ca0.2Co2O6",

abstract = "The temperature-dependent crystal structure and magnetic structure of the layered Ruddlesden-Popper phase Sr2Y0.8Ca0.2Co2O6are reported. The crystal structure is orthorhombic below 270 K [Immm; a=3.84029(7){\AA}, b=3.80691(6){\AA}, and c=19.4980(3){\AA} at 20 K], transformed from tetragonal [I4/mmm; a=3.82765(6){\AA}, and c=19.5795(3){\AA} at 295 K]. The crystal structure distortion is accompanied by an anomalous temperature dependence of the degree of buckling of the CoO2plane and is correlated with the development of anisotropic antiferromagnetic ordering of magnetic moments [2.93(2)μBper Co at 20 K].",

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T1 - Anomalous crystal-structure distortion at the antiferromagnetic transition in the layered cobalt oxide Sr2Y0.8Ca0.2Co2O6

AU - Yamaura, K.

AU - Huang, Q.

AU - Erwin, R. W.

AU - Lynn, J. W.

AU - Cava, R. J.

PY - 1999

Y1 - 1999

N2 - The temperature-dependent crystal structure and magnetic structure of the layered Ruddlesden-Popper phase Sr2Y0.8Ca0.2Co2O6are reported. The crystal structure is orthorhombic below 270 K [Immm; a=3.84029(7)Å, b=3.80691(6)Å, and c=19.4980(3)Å at 20 K], transformed from tetragonal [I4/mmm; a=3.82765(6)Å, and c=19.5795(3)Å at 295 K]. The crystal structure distortion is accompanied by an anomalous temperature dependence of the degree of buckling of the CoO2plane and is correlated with the development of anisotropic antiferromagnetic ordering of magnetic moments [2.93(2)μBper Co at 20 K].

AB - The temperature-dependent crystal structure and magnetic structure of the layered Ruddlesden-Popper phase Sr2Y0.8Ca0.2Co2O6are reported. The crystal structure is orthorhombic below 270 K [Immm; a=3.84029(7)Å, b=3.80691(6)Å, and c=19.4980(3)Å at 20 K], transformed from tetragonal [I4/mmm; a=3.82765(6)Å, and c=19.5795(3)Å at 295 K]. The crystal structure distortion is accompanied by an anomalous temperature dependence of the degree of buckling of the CoO2plane and is correlated with the development of anisotropic antiferromagnetic ordering of magnetic moments [2.93(2)μBper Co at 20 K].

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Anomalous crystal-structure distortion at the antiferromagnetic transition in the layered cobalt oxide Sr₂Y_0.8Ca_0.2Co₂O₆

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