Magnetic field melting of the charge-ordered state of La 1/2Ca1/2MnO3: A local structure perspective

T. A. Tyson; M. Deleon; M. Croft; V. G. Harris; C. C. Kao; J. Kirkland; S. W. Cheong

doi:10.1103/PhysRevB.70.024410

Magnetic field melting of the charge-ordered state of La _1/2Ca_1/2MnO₃: A local structure perspective

T. A. Tyson, M. Deleon, M. Croft, V. G. Harris, C. C. Kao, J. Kirkland, S. W. Cheong

Physics

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Abstract

The local structure about the Mn site in the half-doped system La _1/2Ca_1/2MnO₃ was measured in magnetic fields up 10 T to probe the melting of the charge-ordered state. Examination of the Mn-O and Mn-Mn correlations reveals three distinct regions in the structure-field diagram. A broad region with weak field dependence (mainly antiferromagnetic phase below 7.5 T), a narrow-mixed phase region near ∼8.5 T and a high-field ferromagnetic phase region with strong field-structure coupling are found. At high field the Mn-O radial distribution becomes Gaussian and the Mn-Mn correlations are enhanced-consistent with the dominance of a ferromagnetic phase. Comparison of the structural measurements with transport and magnetization measurements suggests that the exponential changes in resistivity in the first region are dominated by the reordering of the moments on the Mn sites from CE type antiferromagnetic to ferromagnetic order with only a weak change in the local distortions of the MnO₆ octahedra.

Original language	English (US)
Article number	024410
Pages (from-to)	024410-1-024410-7
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.70.024410
State	Published - Jul 2004

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Magnetic field melting of the charge-ordered state of La 1/2Ca1/2MnO3: A local structure perspective",

abstract = "The local structure about the Mn site in the half-doped system La 1/2Ca1/2MnO3 was measured in magnetic fields up 10 T to probe the melting of the charge-ordered state. Examination of the Mn-O and Mn-Mn correlations reveals three distinct regions in the structure-field diagram. A broad region with weak field dependence (mainly antiferromagnetic phase below 7.5 T), a narrow-mixed phase region near ∼8.5 T and a high-field ferromagnetic phase region with strong field-structure coupling are found. At high field the Mn-O radial distribution becomes Gaussian and the Mn-Mn correlations are enhanced-consistent with the dominance of a ferromagnetic phase. Comparison of the structural measurements with transport and magnetization measurements suggests that the exponential changes in resistivity in the first region are dominated by the reordering of the moments on the Mn sites from CE type antiferromagnetic to ferromagnetic order with only a weak change in the local distortions of the MnO6 octahedra.",

author = "Tyson, {T. A.} and M. Deleon and M. Croft and Harris, {V. G.} and Kao, {C. C.} and J. Kirkland and Cheong, {S. W.}",

note = "Funding Information: Data acquisition was performed at Brookhaven National Laboratory{\textquoteright}s National Synchrotron Light Source (NSLS) which is funded by the U. S. Department of Energy. The magnet acquistion funded by NSF IMR Grant No. DMR-0083189 and operational costs were funded by Grant No. NSF DMR-0209243. Sample preparation was supported by Maryland/Rutgers MRSEC NSF-DMR-0080008 (S-W.C.). We are indebted to S. Lamarra of NSLS for much technical assistance in the commissioning of the magnet.",

year = "2004",

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doi = "10.1103/PhysRevB.70.024410",

language = "English (US)",

volume = "70",

pages = "024410--1--024410--7",

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

issn = "0163-1829",

publisher = "American Physical Society",

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T1 - Magnetic field melting of the charge-ordered state of La 1/2Ca1/2MnO3

T2 - A local structure perspective

AU - Tyson, T. A.

AU - Deleon, M.

AU - Croft, M.

AU - Harris, V. G.

AU - Kao, C. C.

AU - Kirkland, J.

AU - Cheong, S. W.

N1 - Funding Information: Data acquisition was performed at Brookhaven National Laboratory’s National Synchrotron Light Source (NSLS) which is funded by the U. S. Department of Energy. The magnet acquistion funded by NSF IMR Grant No. DMR-0083189 and operational costs were funded by Grant No. NSF DMR-0209243. Sample preparation was supported by Maryland/Rutgers MRSEC NSF-DMR-0080008 (S-W.C.). We are indebted to S. Lamarra of NSLS for much technical assistance in the commissioning of the magnet.

PY - 2004/7

Y1 - 2004/7

N2 - The local structure about the Mn site in the half-doped system La 1/2Ca1/2MnO3 was measured in magnetic fields up 10 T to probe the melting of the charge-ordered state. Examination of the Mn-O and Mn-Mn correlations reveals three distinct regions in the structure-field diagram. A broad region with weak field dependence (mainly antiferromagnetic phase below 7.5 T), a narrow-mixed phase region near ∼8.5 T and a high-field ferromagnetic phase region with strong field-structure coupling are found. At high field the Mn-O radial distribution becomes Gaussian and the Mn-Mn correlations are enhanced-consistent with the dominance of a ferromagnetic phase. Comparison of the structural measurements with transport and magnetization measurements suggests that the exponential changes in resistivity in the first region are dominated by the reordering of the moments on the Mn sites from CE type antiferromagnetic to ferromagnetic order with only a weak change in the local distortions of the MnO6 octahedra.

AB - The local structure about the Mn site in the half-doped system La 1/2Ca1/2MnO3 was measured in magnetic fields up 10 T to probe the melting of the charge-ordered state. Examination of the Mn-O and Mn-Mn correlations reveals three distinct regions in the structure-field diagram. A broad region with weak field dependence (mainly antiferromagnetic phase below 7.5 T), a narrow-mixed phase region near ∼8.5 T and a high-field ferromagnetic phase region with strong field-structure coupling are found. At high field the Mn-O radial distribution becomes Gaussian and the Mn-Mn correlations are enhanced-consistent with the dominance of a ferromagnetic phase. Comparison of the structural measurements with transport and magnetization measurements suggests that the exponential changes in resistivity in the first region are dominated by the reordering of the moments on the Mn sites from CE type antiferromagnetic to ferromagnetic order with only a weak change in the local distortions of the MnO6 octahedra.

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Magnetic field melting of the charge-ordered state of La _1/2Ca_1/2MnO₃: A local structure perspective

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