Metal-to-Insulator Crossover in the Low-Temperature Normal State of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>Sr</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>La</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><mml:mi>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Shimpei OnoCentral Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, JapanYoichi AndoCentral Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, JapanTakashi MurayamaCentral Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, JapanFedor BalakirevNHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545Jon BettsNHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545G. S. BoebingerNHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
2000lv
ABI
Abstract
We measure the normal-state in-plane resistivity of Bi(2)Sr(2-x)La(x)CuO(6+delta) single crystals at low temperatures by suppressing superconductivity with 60 T pulsed magnetic fields. With decreasing hole doping, we observe a crossover from a metallic to an insulating behavior in the low-temperature normal state. This crossover is estimated to occur near 1/8 doping, well inside the underdoped regime, and not at optimum doping as reported for other cuprates. The insulating regime is marked by a logarithmic temperature dependence of the resistivity over two decades of temperature, suggesting that a peculiar charge localization is common to the cuprates.
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Cited by 20 references