Scaling behavior of the longitudinal and Hall resistivities in indium films
- Research Center for Very Low Temperature System, Tokyo Institute of Technology, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152 (Japan)
We have made simultaneous measurements of the longitudinal {rho}{sub xx} and Hall {rho}{sub xy} resistivities for granular films of indium with different thicknesses ({bar t}=12, 20, and 60 nm) and the normal-state resistivities ({rho}{sub xxn}=2{endash}5{times}10{sup {minus}5}{Omega}m) at temperatures T down to 0.5 K and in fields B up to 7 T. A striking scaling behavior expressed as {rho}{sub xy}(T)=A{rho}{sub xx}(T){sup {beta}} has been observed for all the films studied irrespective of {bar t} and {rho}{sub xxn} at fixed fields which are not close to a critical field B{sub C}. In the mixed state (B{lt}B{sub C} and T{lt}T{sub C}, where T{sub C} is the transition temperature), the coefficient A and exponent {beta} (=2{endash}3) are nearly independent of the field strength B and the film thickness {bar t}. In the vicinity of the field-driven superconductor-insulator transition, we have found the {ital unusual} insulating region B{sub xxC}{lt}B{lt}B{sub xyC}, where B{sub xxC} and B{sub xyC} represent critical fields determined by {rho}{sub xx} and {rho}{sub xy}, respectively, which tends to grow with increasing {rho}{sub xxn} and/or decreasing {bar t}. This region is similar to one found previously by Paalanen, Hebard, and Ruel in amorphous InO{sub x} thin films, and the present result is consistent with their notion that the insulating region corresponds to the Bose-glass insulator. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 531813
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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