TY - JOUR
T1 - Nonmetal-metal-nonmetal transition and large negative magnetoresistance in (Ga, Mn)As/GaAs
AU - Oiwa, A.
AU - Katsumoto, S.
AU - Endo, A.
AU - Hirasawa, M.
AU - Iye, Y.
AU - Ohno, H.
AU - Matsukura, F.
AU - Shen, A.
AU - Sugawara, Y.
N1 - Funding Information:
Acknowledgements-This work is partly supportedb y a Grant-in-Aid for the Scentific Research from the Ministry of Education, Science, Sports and Culture, Japan. The authors thank Professor H. Takagi at ISSP for his help with the SQUID measurements.
PY - 1997/7
Y1 - 1997/7
N2 - We have studied magnetic and transport properties of a series of Gai1-xMnxAs/GaAs samples with different Mn concentrations (x = 0.015-0.071), For Mn content higher than about 0.02, carrier(hole)-induced ferromagnetism is observed. Samples with x = 0.035 and 0.043 behave as ferromagnetic dirty metals. With further increase of Mn content above x ∼ 0.05, the zero-field resistivity turns a semiconducting temperature dependence. Very large negative magnetoresistance is observed in nonmetallic samples near the metal-nonmetal transitions both in the low and the high Mn content regimes.
AB - We have studied magnetic and transport properties of a series of Gai1-xMnxAs/GaAs samples with different Mn concentrations (x = 0.015-0.071), For Mn content higher than about 0.02, carrier(hole)-induced ferromagnetism is observed. Samples with x = 0.035 and 0.043 behave as ferromagnetic dirty metals. With further increase of Mn content above x ∼ 0.05, the zero-field resistivity turns a semiconducting temperature dependence. Very large negative magnetoresistance is observed in nonmetallic samples near the metal-nonmetal transitions both in the low and the high Mn content regimes.
KW - A. semiconductors
KW - C. impurities in semiconductors
KW - D. electronic transport
KW - Magnetically ordered system
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U2 - 10.1016/S0038-1098(97)00178-6
DO - 10.1016/S0038-1098(97)00178-6
M3 - Article
AN - SCOPUS:0031176806
VL - 103
SP - 209
EP - 213
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 4
ER -