Magnetic and transport properties of III{endash}V diluted magnetic semiconductor Ga{sub 1{minus}x}Cr{sub x}As
Magnetic and transport properties of Cr-based III{endash}V diluted magnetic semiconductor Ga{sub 1{minus}x}Cr{sub x}As Cr concentrations up to x=0.10 have been investigated. For all the films, no long-range magnetic order was observed down to 2 K. A sign of paramagnetic Curie temperature is positive, indicating that the dominant magnetic interaction between Cr atoms is ferromagnetic. The effective number of Bohr magneton is estimated to be 5.1{+-}0.4, which is close to that of Cr{sup 2+} ion. The magnetization curve shows superparamagnetic behavior at low temperatures. The radius of the local spin order in x=0.034 is estimated to be 1.5{endash}2.0 nm at T=5K and it decreases with increasing temperature. From Hall effect measurements at room temperature, the magnitude of mobility is estimated to be less than 0.5 cm2/Vs. This low mobility strongly suggests that the hopping conductivity is dominant in Ga{sub 1{minus}x}Cr{sub x}As films. {copyright} 2001 American Institute of Physics.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40204067
- Journal Information:
- Journal of Applied Physics, Vol. 89, Issue 11; Other Information: DOI: 10.1063/1.1359475; Othernumber: JAPIAU000089000011007392000001; 419111MMM; PBD: 1 Jun 2001; ISSN 0021-8979
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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