Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-06-19
Physics
Condensed Matter
Strongly Correlated Electrons
8 RevTeX pages, 12 figures, uses epsf.sty. Submitted to Phys.Rev.B
Scientific paper
We have studied the magnetic-field-tuned superconductivity destroying quantum transition in amorphous In-O films with the onset of superconductivity in zero field at about 2 K. At temperatures down to 30 mK the critical resistance R_c=R(T,B_c) has been found to change approximately linearly with temperature, which is in contradiction to a standard description where zero slope dR_c/dT = 0 is assumed near T=0. To make the data R(T,B) collapse in the vicinity of transition against scaling variable (B-B_c)/T^{1/y}, one has either to allow for the intrinsic temperature dependence of R_c or to postulate the critical field B_c to be temperature-dependent B_c(T)-B_c(0)~T^{1+1/y}. We find that the state on the high-field side of the transition can be both insulating and metallic and we determine the critical index y=1.2.
Dolgopolov V. T.
Gantmakher V. F.
Golubkov M. V.
Shashkin Alexey
Tsydynzhapov G. E.
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