Magnetic-Field Induced Localization in the Normal State of Superconducting La_2-xSr_xCuo_4

Details Magnetic-Field Induced Localization in the Normal State of Superconducting La_2-xSr_xCuo_4 Magnetic-Field Induced Localization in the Normal State of Superconducting La_2-xSr_xCuo_4

1997-05-14

arxiv.org/abs/cond-mat/9705138v1

Physics

Condensed Matter

Superconductivity

8 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.79.495

Magnetoresistance measurements of highly underdoped superconducting La_{2-x}Sr_xCuO_4 films with $x = 0.051$ and $x = 0.048$, performed in dc magnetic fields up to 20 T and at temperatures down to 40 mK, reveal a magnetic-field induced transition from weak to strong localization in the normal state. The normal-state conductances per CuO_2--plane, measured at different fields in a single specimen, are found to collapse to one curve with the use of a single scaling parameter that is inversely proportional to the localization length. The scaling parameter extrapolates to zero near zero field and possibly at a finite field, suggesting that in the zero-field limit the electronic states may be extended.

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