Abstract
ac Conductivity measurements are carried out across the metal to insulator transition in NiAl0.7Cr0.7Fe0.6O4. The low frequency data is analyzed using Summerfield scaling theory for hopping conductivity. The exponent of the scaling behavior has significantly different values in the conducting and insulating regimes. The hopping frequency and the zero frequency conductivity are found to increase with temperature, slowly in the metallic regime and rapidly in the insulating regime.
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References
J M Daniels and A Rosencwaig, Can. J. Phys. 48, 381 (1970)
U V Chhaya and R G Kulkarni, Mater. Lett. 39, 91 (1999)
S M Yusuf, R Ganguly, K R Chakraborty, P K Mishra, S K Paranjpe, J V Yakhmi and V C Sahni, J. Alloys Comp. 326, 89 (2001) and references therein
Urvi V Chhaya, Bimal S Trivedi and R G Kulkarni, Hyperfine Interactions 116, 197 (1998)
H Jhans, D Kim, R J Rasmussen and J M Honig, Phys. Rev. B54, 11224 (1996)
S Summerfield, Philos. Mag. B52, 9 (1985)
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Rajarajan, A.K., Yusuf, S., Balaya, P. et al. ac Conductivity of mixed spinel NiAl0.7Cr0.7Fe0.6O4 . Pramana - J Phys 58, 787–789 (2002). https://doi.org/10.1007/s12043-002-0172-7
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DOI: https://doi.org/10.1007/s12043-002-0172-7