Abstract
A 61-T pulsed magnetic field suppresses superconductivity in single crystals and reveals an insulator-to-metal (IM) crossover for both in-plane resistivity and -axis resistivity at a Sr concentration near optimum doping ( ). The IM transition is unusual in that all underdoped samples ( ) show low-temperature insulating behavior, even in samples with linear- above and apparently large .
- Received 29 July 1996
DOI:https://doi.org/10.1103/PhysRevLett.77.5417
©1996 American Physical Society