Magnetoresistance in spinel-type MgxCu1-xCr 2S4

Yoichi Kamihara, Masanori Matoba, T. Kyomen, M. Itoh

Research output: Contribution to journalArticle

9 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)247-251
Number of pages5
JournalSolid State Communications
Volume132
Issue number3-4
DOIs
Publication statusPublished - 2004 Oct

Fingerprint

Ferromagnetism
Magnetoresistance
ferromagnetism
spinel
Substitution reactions
Spin glass
substitutes
spin glass
magnetic effects
magnetic anomalies
Curie temperature
Conduction bands
Transport properties
conduction bands
transport properties
orbits
conduction
conductivity
spinell
Temperature

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Magnetoresistance in spinel-type MgxCu1-xCr 2S4 . / Kamihara, Yoichi; Matoba, Masanori; Kyomen, T.; Itoh, M.

In: Solid State Communications, Vol. 132, No. 3-4, 10.2004, p. 247-251.

Research output: Contribution to journalArticle

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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.

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