Optical-Spectroscopic Detection of Spin-Exchange Interaction Pyrochlore Molybdates

M. W. Kim; Y. S. Lee; T. W. Noh; Jaejun Yu; Y. Moritomo

Optical-Spectroscopic Detection of Spin-Exchange Interaction Pyrochlore Molybdates

M. W. Kim
, Y. S. Lee
, T. W. Noh^*
, Jaejun Yu
, Y. Moritomo

^*Corresponding author for this work

Department of Physics

Seoul National University
Nagoya University

Research output: Contribution to journal › Journal article › peer-review

21 Scopus citations

Abstract

The nearest-neighbor spin correlations in pyrochlore moybdates R ₂Mo₂O₇ (R = Y, Sm and Nd) were determined using optical spectroscopy. It was shown that the molybdates exhibited ferromagnetic metal to spin-glass insulator transition, as the R ion size decreases. The effective on-site Coulomb energy U_eff and the Hund rule exchange coupling J_H were estimated using an analysis based on the orbitally degenerate Hubbard model (ODHM). It was demonstrated that the effective superexchange interaction between the Mo ions depends on J _H/U_eff, which determined the phase boundary of the magnetic ground states.

Original language	English
Article number	027202
Pages (from-to)	272021-272024
Number of pages	4
Journal	Physical Review Letters
Volume	92
Issue number	2
State	Published - 2004.01.16

Cite this

@article{e63ecea58f88451ba9f5d46ce7b0227f,

title = "Optical-Spectroscopic Detection of Spin-Exchange Interaction Pyrochlore Molybdates",

abstract = "The nearest-neighbor spin correlations in pyrochlore moybdates R 2Mo2O7 (R = Y, Sm and Nd) were determined using optical spectroscopy. It was shown that the molybdates exhibited ferromagnetic metal to spin-glass insulator transition, as the R ion size decreases. The effective on-site Coulomb energy Ueff and the Hund rule exchange coupling JH were estimated using an analysis based on the orbitally degenerate Hubbard model (ODHM). It was demonstrated that the effective superexchange interaction between the Mo ions depends on J H/Ueff, which determined the phase boundary of the magnetic ground states.",

author = "Kim, \{M. W.\} and Lee, \{Y. S.\} and Noh, \{T. W.\} and Jaejun Yu and Y. Moritomo",

year = "2004",

month = jan,

day = "16",

language = "English",

volume = "92",

pages = "272021--272024",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "2",

}

TY - JOUR

T1 - Optical-Spectroscopic Detection of Spin-Exchange Interaction Pyrochlore Molybdates

AU - Kim, M. W.

AU - Lee, Y. S.

AU - Noh, T. W.

AU - Yu, Jaejun

AU - Moritomo, Y.

PY - 2004/1/16

Y1 - 2004/1/16

N2 - The nearest-neighbor spin correlations in pyrochlore moybdates R 2Mo2O7 (R = Y, Sm and Nd) were determined using optical spectroscopy. It was shown that the molybdates exhibited ferromagnetic metal to spin-glass insulator transition, as the R ion size decreases. The effective on-site Coulomb energy Ueff and the Hund rule exchange coupling JH were estimated using an analysis based on the orbitally degenerate Hubbard model (ODHM). It was demonstrated that the effective superexchange interaction between the Mo ions depends on J H/Ueff, which determined the phase boundary of the magnetic ground states.

AB - The nearest-neighbor spin correlations in pyrochlore moybdates R 2Mo2O7 (R = Y, Sm and Nd) were determined using optical spectroscopy. It was shown that the molybdates exhibited ferromagnetic metal to spin-glass insulator transition, as the R ion size decreases. The effective on-site Coulomb energy Ueff and the Hund rule exchange coupling JH were estimated using an analysis based on the orbitally degenerate Hubbard model (ODHM). It was demonstrated that the effective superexchange interaction between the Mo ions depends on J H/Ueff, which determined the phase boundary of the magnetic ground states.

UR - https://www.scopus.com/pages/publications/9444247494

M3 - Journal article

AN - SCOPUS:9444247494

SN - 0031-9007

VL - 92

SP - 272021

EP - 272024

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 027202

ER -

Optical-Spectroscopic Detection of Spin-Exchange Interaction Pyrochlore Molybdates

Abstract

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