A Study of Structure, Electric and Magnetic Properties of the New Layered Cobalt Oxides Sr2Y1-xCaxCo2Q7-z

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

doi:10.1023/a:1022534420416

A Study of Structure, Electric and Magnetic Properties of the New Layered Cobalt Oxides Sr₂Y_1-xCa_xCo₂Q_7-z

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

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Abstract

The crystal structure of Sr₂Y_0.8Ca_0.2Co₂O₆ 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). A magnetically glassy state below about 35 K and variable range hopping conduction below about 64 K for Sr₂Y_1-xCa_xCo^3.4+₂O _7-z (0.2 ≤ x ≤ 0.5, 0.21 ≤ z ≤ 0.38) were found by magnetic susceptibility and electrical resistivity measurements.

Original language	English (US)
Pages (from-to)	849-853
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	117
Issue number	3-4
DOIs	https://doi.org/10.1023/a:1022534420416
State	Published - 1999

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics
General Materials Science
Condensed Matter Physics

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@article{4f664a6785c947e79f19c92dfb121655,

title = "A Study of Structure, Electric and Magnetic Properties of the New Layered Cobalt Oxides Sr2Y1-xCaxCo2Q7-z",

abstract = "The crystal structure of Sr2Y0.8Ca0.2Co2O6 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). A magnetically glassy state below about 35 K and variable range hopping conduction below about 64 K for Sr2Y1-xCaxCo3.4+2O 7-z (0.2 ≤ x ≤ 0.5, 0.21 ≤ z ≤ 0.38) were found by magnetic susceptibility and electrical resistivity measurements.",

author = "K. Yamaura and Q. Huang and Erwin, {R. W.} and Lynn, {J. W.} and Cava, {R. J.}",

year = "1999",

doi = "10.1023/a:1022534420416",

language = "English (US)",

volume = "117",

pages = "849--853",

journal = "Journal of Low Temperature Physics",

issn = "0022-2291",

publisher = "Springer New York",

number = "3-4",

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TY - JOUR

T1 - A Study of Structure, Electric and Magnetic Properties of the New Layered Cobalt Oxides Sr2Y1-xCaxCo2Q7-z

AU - Yamaura, K.

AU - Huang, Q.

AU - Erwin, R. W.

AU - Lynn, J. W.

AU - Cava, R. J.

PY - 1999

Y1 - 1999

N2 - The crystal structure of Sr2Y0.8Ca0.2Co2O6 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). A magnetically glassy state below about 35 K and variable range hopping conduction below about 64 K for Sr2Y1-xCaxCo3.4+2O 7-z (0.2 ≤ x ≤ 0.5, 0.21 ≤ z ≤ 0.38) were found by magnetic susceptibility and electrical resistivity measurements.

AB - The crystal structure of Sr2Y0.8Ca0.2Co2O6 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). A magnetically glassy state below about 35 K and variable range hopping conduction below about 64 K for Sr2Y1-xCaxCo3.4+2O 7-z (0.2 ≤ x ≤ 0.5, 0.21 ≤ z ≤ 0.38) were found by magnetic susceptibility and electrical resistivity measurements.

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SN - 0022-2291

VL - 117

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EP - 853

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 3-4

ER -

A Study of Structure, Electric and Magnetic Properties of the New Layered Cobalt Oxides Sr₂Y_1-xCa_xCo₂Q_7-z

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