Sensitivity of the magnetic properties of the ZnCr2O4 and MgCr2O4 spinels to nonstoichiometry

S. E. Dutton; Q. Huang; O. Tchernyshyov; C. L. Broholm; R. J. Cava

doi:10.1103/PhysRevB.83.064407

Sensitivity of the magnetic properties of the ZnCr₂O₄ and MgCr₂O₄ spinels to nonstoichiometry

S. E. Dutton, Q. Huang, O. Tchernyshyov, C. L. Broholm, R. J. Cava

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Abstract

We report that small amounts of metal atom nonstoichiometry are possible in the ZnCr₂O₄ and MgCr₂O₄ spinels. The nonstoichiometry, though less than 2%, significantly impacts T_N and the nature of the magnetic correlations above T_N. The Zn _1+xCr_2-xO₄ spinel is particularly sensitive. While stoichiometric ZnCr₂O₄ displays antiferromagnetic short-range correlations in the susceptibility above T_N, ferromagnetic correlations are observed in nonstoichiometric, hole-doped Zn _1+xCr_2-xO₄. The Mg_1+xCr _2-xO₄ spinels are less profoundly affected by non-stoichiometry, though significant changes are also observed. We contrast the magnetic properties of Zn_1+xCr_2-xO₄ and Mg_1+xCr_2-xO₄ (x = 0, 0.02, 0.04) with those of materials with the equivalent amounts of isovalent nonmagnetic Ga3⁺ substituted on the Cr3⁺ site to separate the effects of static site disorder and hole doping.

Original language	English (US)
Article number	064407
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.83.064407
State	Published - Feb 11 2011

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Sensitivity of the magnetic properties of the ZnCr2O4 and MgCr2O4 spinels to nonstoichiometry",

abstract = "We report that small amounts of metal atom nonstoichiometry are possible in the ZnCr2O4 and MgCr2O4 spinels. The nonstoichiometry, though less than 2%, significantly impacts TN and the nature of the magnetic correlations above TN. The Zn 1+xCr2-xO4 spinel is particularly sensitive. While stoichiometric ZnCr2O4 displays antiferromagnetic short-range correlations in the susceptibility above TN, ferromagnetic correlations are observed in nonstoichiometric, hole-doped Zn 1+xCr2-xO4. The Mg1+xCr 2-xO4 spinels are less profoundly affected by non-stoichiometry, though significant changes are also observed. We contrast the magnetic properties of Zn1+xCr2-xO4 and Mg1+xCr2-xO4 (x = 0, 0.02, 0.04) with those of materials with the equivalent amounts of isovalent nonmagnetic Ga3+ substituted on the Cr3+ site to separate the effects of static site disorder and hole doping.",

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doi = "10.1103/PhysRevB.83.064407",

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AU - Dutton, S. E.

AU - Huang, Q.

AU - Tchernyshyov, O.

AU - Broholm, C. L.

AU - Cava, R. J.

PY - 2011/2/11

Y1 - 2011/2/11

N2 - We report that small amounts of metal atom nonstoichiometry are possible in the ZnCr2O4 and MgCr2O4 spinels. The nonstoichiometry, though less than 2%, significantly impacts TN and the nature of the magnetic correlations above TN. The Zn 1+xCr2-xO4 spinel is particularly sensitive. While stoichiometric ZnCr2O4 displays antiferromagnetic short-range correlations in the susceptibility above TN, ferromagnetic correlations are observed in nonstoichiometric, hole-doped Zn 1+xCr2-xO4. The Mg1+xCr 2-xO4 spinels are less profoundly affected by non-stoichiometry, though significant changes are also observed. We contrast the magnetic properties of Zn1+xCr2-xO4 and Mg1+xCr2-xO4 (x = 0, 0.02, 0.04) with those of materials with the equivalent amounts of isovalent nonmagnetic Ga3+ substituted on the Cr3+ site to separate the effects of static site disorder and hole doping.

AB - We report that small amounts of metal atom nonstoichiometry are possible in the ZnCr2O4 and MgCr2O4 spinels. The nonstoichiometry, though less than 2%, significantly impacts TN and the nature of the magnetic correlations above TN. The Zn 1+xCr2-xO4 spinel is particularly sensitive. While stoichiometric ZnCr2O4 displays antiferromagnetic short-range correlations in the susceptibility above TN, ferromagnetic correlations are observed in nonstoichiometric, hole-doped Zn 1+xCr2-xO4. The Mg1+xCr 2-xO4 spinels are less profoundly affected by non-stoichiometry, though significant changes are also observed. We contrast the magnetic properties of Zn1+xCr2-xO4 and Mg1+xCr2-xO4 (x = 0, 0.02, 0.04) with those of materials with the equivalent amounts of isovalent nonmagnetic Ga3+ substituted on the Cr3+ site to separate the effects of static site disorder and hole doping.

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Sensitivity of the magnetic properties of the ZnCr₂O₄ and MgCr₂O₄ spinels to nonstoichiometry

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