Variable-range hopping and positive magnetoresistance in insulating Y[sub 1[minus][ital x]]Pr[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7] crystals

Journal Article · Sat Jan 01 00:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.690· OSTI ID:5425942

Jiang, W; Peng, J L; Hamilton, J J; Greene, R L ^[1]

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1. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)

We have measured in-plane resistivity and magnetoresistance of insulating Y[sub 1[minus][ital x]]Pr[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7] ([ital x][similar to]0.63) crystals in magnetic fields up to 8 T. Mott variable-range-hopping transport [rho]=[rho][sub 0] exp[l brace]([ital T][sub 0]/[ital T])[sup [alpha]][r brace] has been observed with [alpha]=1/4 at low temperatures suggesting the metal-insulator transition caused by Pr doping is due to carrier localization. The magnetoresistance in the Mott variable-range-hopping regime is found to be positive and anisotropic, which may be caused by a decrease of the localiztion length induced by the magnetic field.

• OSTI ID: 5425942
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 49:1; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
MAGNETORESISTANCE
BARIUM OXIDES
COPPER OXIDES
CUPRATES
ELECTRIC CONDUCTIVITY
PRASEODYMIUM OXIDES
TEMPERATURE DEPENDENCE
YTTRIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
665411* - Basic Superconductivity Studies- (1992-)