Substitution effects on ferromagnetic Mott insulator Lu2V2O7

Shin Ichi Shamoto; Takehito Nakano; Yasuo Nozue; Tsuyoshi Kajitani

doi:10.1016/S0022-3697(02)00071-9

Substitution effects on ferromagnetic Mott insulator Lu₂V₂O₇

Shin Ichi Shamoto
, Takehito Nakano
, Yasuo Nozue
, Tsuyoshi Kajitani

Department of Physics

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

A model is proposed for the ferromagnetism of a Mott insulator Lu₂V₂O₇. In relation to this model, substitution effects of Ti and Nb atoms for V atoms in Lu₂V₂O₇ have been studied, where all ions are found to have valence of +4, i.e. S = 1/2 for V⁴⁺, S = 0 for Ti⁴⁺ and S = 1/2 for Nb⁴⁺ as a localized spin by studying their lattice parameters and Curie constants. Saturated magnetic moments in Lu₂V_2-xNb_xO₇ system are smaller than paramagnetic moments in Curie-Weiss law, indicating spin canting or anisotropy. Its effect on Curie temperature T_c corresponds to the decrease of mean magnetic moments along the magnetic field, while the effect of Ti substitution on T_c is explained by the decrease of number of the nearest neighbor spins. These substitution effects on T_c do not contradict the present model.

Original language	English
Pages (from-to)	1047-1050
Number of pages	4
Journal	Journal of Physics and Chemistry of Solids
Volume	63
Issue number	6-8
DOIs	https://doi.org/10.1016/S0022-3697(02)00071-9
Publication status	Published - 2002

All Science Journal Classification (ASJC) codes

General Chemistry
General Materials Science
Condensed Matter Physics

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@article{c9a52b090c0d45ee8b7f1e9a8f97ee81,

title = "Substitution effects on ferromagnetic Mott insulator Lu2V2O7",

abstract = "A model is proposed for the ferromagnetism of a Mott insulator Lu2V2O7. In relation to this model, substitution effects of Ti and Nb atoms for V atoms in Lu2V2O7 have been studied, where all ions are found to have valence of +4, i.e. S = 1/2 for V4+, S = 0 for Ti4+ and S = 1/2 for Nb4+ as a localized spin by studying their lattice parameters and Curie constants. Saturated magnetic moments in Lu2V2-xNbxO7 system are smaller than paramagnetic moments in Curie-Weiss law, indicating spin canting or anisotropy. Its effect on Curie temperature Tc corresponds to the decrease of mean magnetic moments along the magnetic field, while the effect of Ti substitution on Tc is explained by the decrease of number of the nearest neighbor spins. These substitution effects on Tc do not contradict the present model.",

author = "Shamoto, \{Shin Ichi\} and Takehito Nakano and Yasuo Nozue and Tsuyoshi Kajitani",

note = "Funding Information: We would like to thank Profs K. Ueda, K. Sasaki, S. Inagaki, J. Kanamori, and Dr M. Nishi for fruitful discussions, Dr Y. Ono, Messrs H. Tazawa, S. Takeda, and S. Kawano for their help. This work was supported by a Grant-in-Aid (12046211) {\textquoteleft}Novel Quantum Phenomena in Transition Metal Oxides{\textquoteright} for Scientific Research on Priority Area from the Ministry of Education, Science, Sports, and Culture of Japan.",

year = "2002",

doi = "10.1016/S0022-3697(02)00071-9",

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T1 - Substitution effects on ferromagnetic Mott insulator Lu2V2O7

AU - Shamoto, Shin Ichi

AU - Nakano, Takehito

AU - Nozue, Yasuo

AU - Kajitani, Tsuyoshi

N1 - Funding Information: We would like to thank Profs K. Ueda, K. Sasaki, S. Inagaki, J. Kanamori, and Dr M. Nishi for fruitful discussions, Dr Y. Ono, Messrs H. Tazawa, S. Takeda, and S. Kawano for their help. This work was supported by a Grant-in-Aid (12046211) ‘Novel Quantum Phenomena in Transition Metal Oxides’ for Scientific Research on Priority Area from the Ministry of Education, Science, Sports, and Culture of Japan.

PY - 2002

Y1 - 2002

N2 - A model is proposed for the ferromagnetism of a Mott insulator Lu2V2O7. In relation to this model, substitution effects of Ti and Nb atoms for V atoms in Lu2V2O7 have been studied, where all ions are found to have valence of +4, i.e. S = 1/2 for V4+, S = 0 for Ti4+ and S = 1/2 for Nb4+ as a localized spin by studying their lattice parameters and Curie constants. Saturated magnetic moments in Lu2V2-xNbxO7 system are smaller than paramagnetic moments in Curie-Weiss law, indicating spin canting or anisotropy. Its effect on Curie temperature Tc corresponds to the decrease of mean magnetic moments along the magnetic field, while the effect of Ti substitution on Tc is explained by the decrease of number of the nearest neighbor spins. These substitution effects on Tc do not contradict the present model.

AB - A model is proposed for the ferromagnetism of a Mott insulator Lu2V2O7. In relation to this model, substitution effects of Ti and Nb atoms for V atoms in Lu2V2O7 have been studied, where all ions are found to have valence of +4, i.e. S = 1/2 for V4+, S = 0 for Ti4+ and S = 1/2 for Nb4+ as a localized spin by studying their lattice parameters and Curie constants. Saturated magnetic moments in Lu2V2-xNbxO7 system are smaller than paramagnetic moments in Curie-Weiss law, indicating spin canting or anisotropy. Its effect on Curie temperature Tc corresponds to the decrease of mean magnetic moments along the magnetic field, while the effect of Ti substitution on Tc is explained by the decrease of number of the nearest neighbor spins. These substitution effects on Tc do not contradict the present model.

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JO - Journal of Physics and Chemistry of Solids

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IS - 6-8

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Substitution effects on ferromagnetic Mott insulator Lu₂V₂O₇

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