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Phys. Rev. Lett. 77, 5417 - 5420 (1996)

Insulator-to-Metal Crossover in the Normal State of La2-xSrxCuO4 Near Optimum Doping

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G. S. Boebinger, Yoichi Ando, and A. Passner
Bell Laboratories, Lucent Technologies, 700 Mountain Avenue, Murray Hill, New Jersey 07974

T. Kimura, M. Okuya, J. Shimoyama, and K. Kishio
Department of Applied Chemistry, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan

K. Tamasaku, N. Ichikawa, and S. Uchida
Superconductivity Research Course, University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113, Japan

Received 29 July 1996

A 61-T pulsed magnetic field suppresses superconductivity in La2-xSrxCuO4 single crystals and reveals an insulator-to-metal (IM) crossover for both in-plane resistivity ρab and c-axis resistivity ρc at a Sr concentration near optimum doping ( x≃0.16). The IM transition is unusual in that all underdoped samples ( x<0.16) show low-temperature insulating behavior, even in samples with linear- T ρab above Tc and apparently large kFl.


©1996 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.77.5417
DOI: 10.1103/PhysRevLett.77.5417
PACS: 74.25.Dw, 74.25.Fy, 74.72.Dn

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