Enhanced magnetoresistance in YBa{sub 2}Cu{sub 3}O{sub 7}/Nd{sub 0.7}Sr{sub 0.3}MnO{sub 3} heterostructures using magnetic flux focusing

Journal Article · Fri Nov 01 00:00:00 EST 1996 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.117283· OSTI ID:397398

Dong, Z W; Boettcher, T; Chen, C; Takeuchi, I; Rajeswari, M; Sharma, R P; Venkatesan, T ^[1]

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

Enhanced low field magnetoresistance (MR) in Nd{sub 0.7}Sr{sub 0.3}MnO{sub 3} (NSMO) has been achieved by using high-{ital T}{sub {ital c}} superconducting flux focusing devices made of YBa{sub 2}Cu{sub 3}O{sub 7}(YBCO)/NSMO heterostructures. Two kinds of flux focusing schemes, gap, and washer devices, have been used where an applied magnetic field is expelled from patterned YBCO pads and focused onto a bridge of NSMO film. Using such a magnetic lens, at temperatures below 77 K {approximately}800{percent} enhancement in MR={minus}({ital R}{sub {ital H}}{minus}{ital R}{sub 0})/{ital R}{sub 0} was observed for different samples. This corresponds to more than 10{percent} change in the MR of NSMO in the presence of 200 G. For the maximum MR response in NSMO, the YBCO/NSMO heterostructures were deposited on (100) LaAlO{sub 3} substrate by pulsed laser deposition {ital in} {ital situ} so that the peak resistance temperature ({ital T}{sub {ital p}}) of NSMO was below the superconducting transition temperature ({ital T}{sub {ital c}}) of YBCO. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 397398
• Journal Information: Applied Physics Letters, Vol. 69, Issue 22; Other Information: PBD: Nov 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
YTTRIUM OXIDES
HETEROJUNCTIONS
BARIUM OXIDES
COPPER OXIDES
NEODYMIUM OXIDES
STRONTIUM OXIDES
MANGANESE OXIDES
HIGH-TC SUPERCONDUCTORS
MAGNETORESISTANCE
MAGNETIC FLUX
TEMPERATURE DEPENDENCE
HETEROSTRUCTURES