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Quantum hall ferromagnetic-paramagnetic transition in p-Si/SiGe/Si quantum wells in a tilted magnetic field
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Drichko, I. L., Smirnov, I. Yu., Suslov, A. V., Mironov, O. A. and Leadley, D. R. (David R.) (2012) Quantum hall ferromagnetic-paramagnetic transition in p-Si/SiGe/Si quantum wells in a tilted magnetic field. Journal of Physics: Conference Series, Volume 400 (Number 4). Article number 042005. doi:10.1088/1742-6596/400/4/042005 ISSN 1742-6596.
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Official URL: http://dx.doi.org/10.1088/1742-6596/400/4/042005
Abstract
Magnetoresistance components ρxx and ρxy were measured in two p-Si/SiGe/Si quantum well samples with an anisotropic g-factor in a tilted magnetic field of up to 18T as a function of temperature (20 mK-2 K) and tilt angle. We analyzed dependences of the conductivity, the activation energy ΔE, and the filling factor ν on the tilt angle circleddash. In the sample with density p = 2 × 1011 cm−2 in the vicinity of ν = 2 ΔE(circleddash) undergoes a minima at circleddash asymp 60o, while ν(circleddash) shows a sharp jump. These facts allowed us to conclude that at circleddash asymp 60o and ν asymp 2 a crossing of the Landau levels 0↑ and 1↓ occurs. It leads to the first order ferromagnetic-paramagnetic (F-P) phase transition. A coexistence of two phases at the transition point also supports the idea. However, in another sample, with p = 7.2 × 1010 cm−2, no transition was observed. For both samples we have obtained the dependences of the effective g-factor on the tilt angle, which led us to the conclusion that the F-P transition in the p-Si/SiGe/Si structure in a tilted magnetic field is a result of a violation of the glowast-factor axial symmetry due to disorder.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Journal of Physics: Conference Series | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 1742-6596 | ||||
Official Date: | 2012 | ||||
Dates: |
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Volume: | Volume 400 | ||||
Number: | Number 4 | ||||
Page Range: | Article number 042005 | ||||
DOI: | 10.1088/1742-6596/400/4/042005 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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