Magnetoresistance in spinel-type MgxCu1-xCr 2S4

Y. Kamihara; M. Matoba; T. Kyomen; M. Itoh

doi:10.1016/j.ssc.2004.07.034

Magnetoresistance in spinel-type Mg_xCu_1-xCr ₂S₄

Y. Kamihara, M. Matoba, T. Kyomen, M. Itoh

Department of Applied Physics and Physico-Informatics

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

9 Citations (Scopus)

Abstract

CuCr₂S₄ shows a p-type metallic conductivity and ferromagnetism with Curie temperatures T_c of 375 K, and exhibit magnetic anomaly at 84 K (= T_m). CuCr₂S₄ exhibits the coexistence of both the ferromagnetism and spin-glass with the irreversible magnetic effect below T_m. The partial 20% Mg-substitution for Cu in CuCr₂S₄ slightly reduces the T_c and T_m. Magnetorsistance of Mg_xCu _1-xCr₂S₄ can be expressed as Δp=aH ²-bHⁿ below T^m. a, b, and n are temperature-dependent adjustable parameters. These unique MR behavior would be attributed to the coexistence of the ferromagnetism and spin-glass-like order below T_m, Mg-substitution decreased the conducting carrier, which forms the conduction band whose orbital motion gave the positive MR contribution. Therefore, Mg-substitution gave smaller positive MR contribution and consequently gave larger negative MR (maximum 7% at 10 K) in Mg _0.2Cu_0.8Cr₂S₄. These results suggest that Cr 3d band filling control can be expected to give functional magnetoelectric transport properties in CuCr₂S4.

Original language	English
Pages (from-to)	247-251
Number of pages	5
Journal	Solid State Communications
Volume	132
Issue number	3-4
DOIs	https://doi.org/10.1016/j.ssc.2004.07.034
Publication status	Published - 2004 Oct

Keywords

A. Chalcogen
A. Thiospinel
D. Double exchange interaction
D. Magnetoresistance
D. Room temperature ferromagnetism

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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@article{ae1ab7fcf5744e79bc4f053e7304a4e3,

title = "Magnetoresistance in spinel-type MgxCu1-xCr 2S4",

abstract = "CuCr2S4 shows a p-type metallic conductivity and ferromagnetism with Curie temperatures Tc of 375 K, and exhibit magnetic anomaly at 84 K (= Tm). CuCr2S4 exhibits the coexistence of both the ferromagnetism and spin-glass with the irreversible magnetic effect below Tm. The partial 20% Mg-substitution for Cu in CuCr2S4 slightly reduces the Tc and Tm. Magnetorsistance of MgxCu 1-xCr2S4 can be expressed as Δp=aH 2-bHn below Tm. a, b, and n are temperature-dependent adjustable parameters. These unique MR behavior would be attributed to the coexistence of the ferromagnetism and spin-glass-like order below Tm, Mg-substitution decreased the conducting carrier, which forms the conduction band whose orbital motion gave the positive MR contribution. Therefore, Mg-substitution gave smaller positive MR contribution and consequently gave larger negative MR (maximum 7% at 10 K) in Mg 0.2Cu0.8Cr2S4. These results suggest that Cr 3d band filling control can be expected to give functional magnetoelectric transport properties in CuCr2S4.",

keywords = "A. Chalcogen, A. Thiospinel, D. Double exchange interaction, D. Magnetoresistance, D. Room temperature ferromagnetism",

author = "Y. Kamihara and M. Matoba and T. Kyomen and M. Itoh",

note = "Funding Information: One (M.M.) of us is indebted to Prof. G.A. Sawatzky (University of Groningen) for his helpful advises during the stay in his laboratory. One (Y.K.) of us was financialy supported by a Grant-in-Aid for the 21st century COE program {\textquoteleft}Keio Optical and Electronic Device Technology for Access Network{\textquoteright} from the Ministry of Education, Culture, Sports, Science, and Technology, Japan. This work was partially supported by the Research Grants of Keio University and performed under Collaborative Research Project of Materials and Structures Laboratory, Tokyo Institute of Technology.",

year = "2004",

month = oct,

doi = "10.1016/j.ssc.2004.07.034",

language = "English",

volume = "132",

pages = "247--251",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Limited",

number = "3-4",

}

TY - JOUR

T1 - Magnetoresistance in spinel-type MgxCu1-xCr 2S4

AU - Kamihara, Y.

AU - Matoba, M.

AU - Kyomen, T.

AU - Itoh, M.

N1 - Funding Information: One (M.M.) of us is indebted to Prof. G.A. Sawatzky (University of Groningen) for his helpful advises during the stay in his laboratory. One (Y.K.) of us was financialy supported by a Grant-in-Aid for the 21st century COE program ‘Keio Optical and Electronic Device Technology for Access Network’ from the Ministry of Education, Culture, Sports, Science, and Technology, Japan. This work was partially supported by the Research Grants of Keio University and performed under Collaborative Research Project of Materials and Structures Laboratory, Tokyo Institute of Technology.

PY - 2004/10

Y1 - 2004/10

N2 - CuCr2S4 shows a p-type metallic conductivity and ferromagnetism with Curie temperatures Tc of 375 K, and exhibit magnetic anomaly at 84 K (= Tm). CuCr2S4 exhibits the coexistence of both the ferromagnetism and spin-glass with the irreversible magnetic effect below Tm. The partial 20% Mg-substitution for Cu in CuCr2S4 slightly reduces the Tc and Tm. Magnetorsistance of MgxCu 1-xCr2S4 can be expressed as Δp=aH 2-bHn below Tm. a, b, and n are temperature-dependent adjustable parameters. These unique MR behavior would be attributed to the coexistence of the ferromagnetism and spin-glass-like order below Tm, Mg-substitution decreased the conducting carrier, which forms the conduction band whose orbital motion gave the positive MR contribution. Therefore, Mg-substitution gave smaller positive MR contribution and consequently gave larger negative MR (maximum 7% at 10 K) in Mg 0.2Cu0.8Cr2S4. These results suggest that Cr 3d band filling control can be expected to give functional magnetoelectric transport properties in CuCr2S4.

AB - CuCr2S4 shows a p-type metallic conductivity and ferromagnetism with Curie temperatures Tc of 375 K, and exhibit magnetic anomaly at 84 K (= Tm). CuCr2S4 exhibits the coexistence of both the ferromagnetism and spin-glass with the irreversible magnetic effect below Tm. The partial 20% Mg-substitution for Cu in CuCr2S4 slightly reduces the Tc and Tm. Magnetorsistance of MgxCu 1-xCr2S4 can be expressed as Δp=aH 2-bHn below Tm. a, b, and n are temperature-dependent adjustable parameters. These unique MR behavior would be attributed to the coexistence of the ferromagnetism and spin-glass-like order below Tm, Mg-substitution decreased the conducting carrier, which forms the conduction band whose orbital motion gave the positive MR contribution. Therefore, Mg-substitution gave smaller positive MR contribution and consequently gave larger negative MR (maximum 7% at 10 K) in Mg 0.2Cu0.8Cr2S4. These results suggest that Cr 3d band filling control can be expected to give functional magnetoelectric transport properties in CuCr2S4.

KW - A. Chalcogen

KW - A. Thiospinel

KW - D. Double exchange interaction

KW - D. Magnetoresistance

KW - D. Room temperature ferromagnetism

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U2 - 10.1016/j.ssc.2004.07.034

DO - 10.1016/j.ssc.2004.07.034

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EP - 251

JO - Solid State Communications

JF - Solid State Communications

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