Inhomogeneous magnetic cluster states in the magnetoresistance material Lu2 V2 O7

K. Y. Choi; Z. Wang; P. Lemmens; H. D. Zhou; J. Van Tol; N. S. Dalal; C. R. Wiebe

doi:10.1103/PhysRevB.82.054430

Inhomogeneous magnetic cluster states in the magnetoresistance material Lu₂ V₂ O₇

K. Y. Choi, Z. Wang, P. Lemmens, H. D. Zhou, J. Van Tol, N. S. Dalal, C. R. Wiebe

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8 Scopus citations

Abstract

We report Raman scattering and multifrequency (54-336 GHz) electron-spin-resonance (ESR) measurements on Lu₂ V₂ O₇ single crystals in the temperature range 4-300K with the view of understanding the origin of the large magnetoresistance in this lattice. The 307 cm^-1 phonon mode undergoes a hardening at temperatures below T _m =150K. Concomitantly, the single ESR peak arising from the paramagnetic V⁴⁺ ions becomes distorted. This is ascribed to the development of short-range magnetic correlations leading to a formation of magnetic clusters. Below the Curie temperature T_C=70K the ESR line develops with fine structures, indicative of an inhomogeneous ground state. Between T_m and T_C the magnetic cluster concentration decreases strongly as a function of the applied magnetic field, suggesting that the large magnetoresistance of this material could be due to the magnetic inhomogeneity in this lattice. The origin of what causes the initiation of such clusters is still unclear.

Original language	English
Article number	054430
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	82
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.82.054430
State	Published - 30 Aug 2010
Externally published	Yes

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title = "Inhomogeneous magnetic cluster states in the magnetoresistance material Lu2 V2 O7",

abstract = "We report Raman scattering and multifrequency (54-336 GHz) electron-spin-resonance (ESR) measurements on Lu2 V2 O7 single crystals in the temperature range 4-300K with the view of understanding the origin of the large magnetoresistance in this lattice. The 307 cm-1 phonon mode undergoes a hardening at temperatures below T m =150K. Concomitantly, the single ESR peak arising from the paramagnetic V4+ ions becomes distorted. This is ascribed to the development of short-range magnetic correlations leading to a formation of magnetic clusters. Below the Curie temperature TC=70K the ESR line develops with fine structures, indicative of an inhomogeneous ground state. Between Tm and TC the magnetic cluster concentration decreases strongly as a function of the applied magnetic field, suggesting that the large magnetoresistance of this material could be due to the magnetic inhomogeneity in this lattice. The origin of what causes the initiation of such clusters is still unclear.",

author = "Choi, \{K. Y.\} and Z. Wang and P. Lemmens and Zhou, \{H. D.\} and \{Van Tol\}, J. and Dalal, \{N. S.\} and Wiebe, \{C. R.\}",

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doi = "10.1103/PhysRevB.82.054430",

language = "English",

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T1 - Inhomogeneous magnetic cluster states in the magnetoresistance material Lu2 V2 O7

AU - Choi, K. Y.

AU - Wang, Z.

AU - Lemmens, P.

AU - Zhou, H. D.

AU - Van Tol, J.

AU - Dalal, N. S.

AU - Wiebe, C. R.

PY - 2010/8/30

Y1 - 2010/8/30

N2 - We report Raman scattering and multifrequency (54-336 GHz) electron-spin-resonance (ESR) measurements on Lu2 V2 O7 single crystals in the temperature range 4-300K with the view of understanding the origin of the large magnetoresistance in this lattice. The 307 cm-1 phonon mode undergoes a hardening at temperatures below T m =150K. Concomitantly, the single ESR peak arising from the paramagnetic V4+ ions becomes distorted. This is ascribed to the development of short-range magnetic correlations leading to a formation of magnetic clusters. Below the Curie temperature TC=70K the ESR line develops with fine structures, indicative of an inhomogeneous ground state. Between Tm and TC the magnetic cluster concentration decreases strongly as a function of the applied magnetic field, suggesting that the large magnetoresistance of this material could be due to the magnetic inhomogeneity in this lattice. The origin of what causes the initiation of such clusters is still unclear.

AB - We report Raman scattering and multifrequency (54-336 GHz) electron-spin-resonance (ESR) measurements on Lu2 V2 O7 single crystals in the temperature range 4-300K with the view of understanding the origin of the large magnetoresistance in this lattice. The 307 cm-1 phonon mode undergoes a hardening at temperatures below T m =150K. Concomitantly, the single ESR peak arising from the paramagnetic V4+ ions becomes distorted. This is ascribed to the development of short-range magnetic correlations leading to a formation of magnetic clusters. Below the Curie temperature TC=70K the ESR line develops with fine structures, indicative of an inhomogeneous ground state. Between Tm and TC the magnetic cluster concentration decreases strongly as a function of the applied magnetic field, suggesting that the large magnetoresistance of this material could be due to the magnetic inhomogeneity in this lattice. The origin of what causes the initiation of such clusters is still unclear.

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DO - 10.1103/PhysRevB.82.054430

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 5

M1 - 054430

ER -

Inhomogeneous magnetic cluster states in the magnetoresistance material Lu₂ V₂ O₇

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