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 language | English |
|---|---|
| Pages (from-to) | 247-251 |
| Number of pages | 5 |
| Journal | Solid State Communications |
| Volume | 132 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - 2004 Oct |
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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 journal › Article
}
TY - JOUR
T1 - Magnetoresistance in spinel-type MgxCu1-xCr 2S4
AU - Kamihara, Yoichi
AU - Matoba, Masanori
AU - Kyomen, T.
AU - Itoh, M.
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
UR - http://www.scopus.com/inward/record.url?scp=4444244728&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4444244728&partnerID=8YFLogxK
U2 - 10.1016/j.ssc.2004.07.034
DO - 10.1016/j.ssc.2004.07.034
M3 - Article
AN - SCOPUS:4444244728
VL - 132
SP - 247
EP - 251
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 3-4
ER -