Magnetic-Field Induced Superconductor-Insulator Transition in the La 2 − x Sr x …
1996; American Physical Society; Volume: 77; Issue: 14 Linguagem: Inglês
10.1103/physrevlett.77.3033
ISSN1092-0145
AutoresK. Karpińska, A. Malinowski, Marta Z. Cieplak, Saikat Guha, Sophia Gershman, Gabriel Kotliar, T. Skośkiewicz, W. Plesiewicz, M. Berkowski, P. Lindenfeld,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoThe magnetoresistance of underdoped ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{CuO}$ films with $x\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.048$ and $0.051$ is studied in magnetic fields up to 8.5 T and at temperatures down to 30 mK. The results indicate that the magnetic-field induced superconductor-insulator (SI) transition is qualitatively different from the reentrant transition described for indium oxide and interpreted as leading to a ``bosonic insulator'' phase. The ground state in the absence of superconductivity appears to be insulating. The transitions become narrower below 1 K and show that the resistive critical field diverges approaching zero temperature, as has also been observed in other high- ${T}_{c}$ systems.
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