Magnetic behavior of a La0.9Ca0.1MnO3 crystal

Vladimir Chechersky; Amar Nath; Samuel E. Lofland; S. Newlander; L. Cerquoni; Y. Mukovskii; A. A. Arsenov; G. Karabshev; D. A. Shulyatev; Richard L. Greene

doi:10.1103/PhysRevB.63.214401

Magnetic behavior of a La_0.9Ca_0.1MnO₃ crystal

Vladimir Chechersky, Amar Nath, Samuel E. Lofland, S. Newlander, L. Cerquoni, Y. Mukovskii, A. A. Arsenov, G. Karabshev, D. A. Shulyatev, Richard L. Greene

Physics

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Abstract

We have studied the magnetic behavior of a single crystal of the underdoped manganite La_0.9Ca_0.1MnO₃, by ac susceptibility measurements and emission Mössbauer spectroscopic studies. We do not find any evidence of the presence of antiferromagnetic species as reported by some groups. The breakdown of the long-range ferromagnetic order occurs only above 0.93T_c. This behavior is in sharp contrast to that observed for polycrystalline La_0.8Ca_0.2MnO₃ and La_0.7Ca_0.3MnO₃ where the breakdown starts occurring at as low a temperature as 0.7T_c. It seems that the local distortions introduced by aliovalent substitutions lead to enhanced anharmonicity of Mn-O-Mn vibrations and torsional oscillations between Mn-O octahedra, which in turn induce anomalous breakdown of long-range order even below T_c. However, we observe strong short range order in magnetic polarons above T_c.

Original language	English (US)
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	63
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.63.214401
State	Published - Apr 26 2001

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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@article{20446e783ba04ec484b1ada025aed254,

title = "Magnetic behavior of a La0.9Ca0.1MnO3 crystal",

abstract = "We have studied the magnetic behavior of a single crystal of the underdoped manganite La0.9Ca0.1MnO3, by ac susceptibility measurements and emission M{\"o}ssbauer spectroscopic studies. We do not find any evidence of the presence of antiferromagnetic species as reported by some groups. The breakdown of the long-range ferromagnetic order occurs only above 0.93Tc. This behavior is in sharp contrast to that observed for polycrystalline La0.8Ca0.2MnO3 and La0.7Ca0.3MnO3 where the breakdown starts occurring at as low a temperature as 0.7Tc. It seems that the local distortions introduced by aliovalent substitutions lead to enhanced anharmonicity of Mn-O-Mn vibrations and torsional oscillations between Mn-O octahedra, which in turn induce anomalous breakdown of long-range order even below Tc. However, we observe strong short range order in magnetic polarons above Tc.",

author = "Vladimir Chechersky and Amar Nath and Lofland, {Samuel E.} and S. Newlander and L. Cerquoni and Y. Mukovskii and Arsenov, {A. A.} and G. Karabshev and Shulyatev, {D. A.} and Greene, {Richard L.}",

year = "2001",

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doi = "10.1103/PhysRevB.63.214401",

language = "English (US)",

volume = "63",

journal = "Physical Review B - Condensed Matter and Materials Physics",

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T1 - Magnetic behavior of a La0.9Ca0.1MnO3 crystal

AU - Chechersky, Vladimir

AU - Nath, Amar

AU - Lofland, Samuel E.

AU - Newlander, S.

AU - Cerquoni, L.

AU - Mukovskii, Y.

AU - Arsenov, A. A.

AU - Karabshev, G.

AU - Shulyatev, D. A.

AU - Greene, Richard L.

PY - 2001/4/26

Y1 - 2001/4/26

N2 - We have studied the magnetic behavior of a single crystal of the underdoped manganite La0.9Ca0.1MnO3, by ac susceptibility measurements and emission Mössbauer spectroscopic studies. We do not find any evidence of the presence of antiferromagnetic species as reported by some groups. The breakdown of the long-range ferromagnetic order occurs only above 0.93Tc. This behavior is in sharp contrast to that observed for polycrystalline La0.8Ca0.2MnO3 and La0.7Ca0.3MnO3 where the breakdown starts occurring at as low a temperature as 0.7Tc. It seems that the local distortions introduced by aliovalent substitutions lead to enhanced anharmonicity of Mn-O-Mn vibrations and torsional oscillations between Mn-O octahedra, which in turn induce anomalous breakdown of long-range order even below Tc. However, we observe strong short range order in magnetic polarons above Tc.

AB - We have studied the magnetic behavior of a single crystal of the underdoped manganite La0.9Ca0.1MnO3, by ac susceptibility measurements and emission Mössbauer spectroscopic studies. We do not find any evidence of the presence of antiferromagnetic species as reported by some groups. The breakdown of the long-range ferromagnetic order occurs only above 0.93Tc. This behavior is in sharp contrast to that observed for polycrystalline La0.8Ca0.2MnO3 and La0.7Ca0.3MnO3 where the breakdown starts occurring at as low a temperature as 0.7Tc. It seems that the local distortions introduced by aliovalent substitutions lead to enhanced anharmonicity of Mn-O-Mn vibrations and torsional oscillations between Mn-O octahedra, which in turn induce anomalous breakdown of long-range order even below Tc. However, we observe strong short range order in magnetic polarons above Tc.

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DO - 10.1103/PhysRevB.63.214401

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VL - 63

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 21

ER -

Magnetic behavior of a La_0.9Ca_0.1MnO₃ crystal

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