G Biskupski et al 1988 J. Phys. C: Solid State Phys. 21 333 doi:10.1088/0022-3719/21/2/017
G Biskupski, H Dubois and A Briggs
Show affiliationsThe DC magnetoresistivity measurements of a compensated and barely insulating indium phosphide sample yield results showing variable-range hopping (VRH) in the temperature range 0.09 K<T<4.2 K for magnetic fields up to 11 T. Analysis of the conductivity data in terms of the relation sigma = sigma 0 exp(-(T0/T)3) indicates that s=0.25 for B<6 T, i.e. near the metal-insulator transition, while for larger magnetic fields (B>6T) s=0.5. This suggests that, in the vicinity of the metal-insulator transition, the VRH is in agreement with Mott's predictions (1968) assuming a constant density of states N(EF) at the Fermi level whereas, far from the metal-insulator transition, a Coulomb gap is opening, in agreement with the predictions of Shklovskii and Efros (1984).
72.20.My Galvanomagnetic and other magnetotransport effects
72.80.Ey III-V and II-VI semiconductors
71.30.+h Metal-insulator transitions and other electronic transitions
Issue 2 (20 January 1988)
G Biskupski et al 1988 J. Phys. C: Solid State Phys. 21 333
A Emir Gümrükçüoğlu et al JCAP11(2007)005
J Hendriks et al 2006 J. Phys. D: Appl. Phys. 39 274
J C Legras et al 1999 Metrologia 36 663
J B Griffiths and J Podolský 2007 Class. Quantum Grav. 24 1687
Jérôme Martin et al JHEP03(2005)060
Huang She-Song et al 2008 Chinese Phys. B 17 323
Vl.V. Bobkov et al 2006 Nucl. Fusion 46 S469
Cheng Rong Li and Tsin Chi Yang 1991 J. Phys. D: Appl. Phys. 24 48
J A Blanco and J Pisonero 1999 Eur. J. Phys. 20 289