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Linear magnetoresistance in topological insulator thin films: Quantum phase coherence effects at high temperatures

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6 Author(s)
Assaf, B. A. ; Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA ; Cardinal, T. ; Wei, P. ; Katmis, F.
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In addition to the weak antilocalization cusp observed in the magnetoresistance (MR) of topological insulators at low temperatures and low magnetic fields, we find that the high-field MR in Bi2Te2Se is linear in field. At fields up to B = 14 T, the slope of this linear-like MR is nearly independent of temperature over the range T = 7 to 150 K. We find that the linear MR arises from the competition between a logarithmic phase coherence component and a quadratic component. The quantum phase coherence dominates up to high temperatures, where the coherence length remains longer than the mean free path of electrons.

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Applied Physics Letters  (Volume:102 ,  Issue: 1 )