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Magnetoresistance measurements of highly underdoped superconductingLa_{2-x}Sr_xCuO_4 films with $x = 0.051$ and $x = 0.048$, performed in dcmagnetic fields up to 20 T and at temperatures down to 40 mK, reveal amagnetic-field induced transition from weak to strong localization in thenormal state. The normal-state conductances per CuO_2--plane, measured atdifferent fields in a single specimen, are found to collapse to one curve withthe use of a single scaling parameter that is inversely proportional to thelocalization length. The scaling parameter extrapolates to zero near zero fieldand possibly at a finite field, suggesting that in the zero-field limit theelectronic states may be extended.Comment: 8 pages, 5 figure

physical review letters

Magnetic-Field–Induced Localization in the Normal State of Superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><…

Magnetic-Field–Induced Localization in the Normal State of SuperconductingLa2−xSrx<…