Published June 2001 | Version v1
Journal article Metadata-only

Electronic anisotropy, magnetic field-temperature phase diagram and their dependence on resistivity in c-axis oriented MgB2 thin films

Creators

  • 1. Applied Superconductivity Center, University of Wisconsin-Madison, Madison, WI (United States)
  • 2. Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI (United States)
  • 3. Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA (United States)

Description

An important predicted, but so far uncharacterised, property of the new superconductor MgB2 is electronic anisotropy arising from its layered crystal structure. Here we report on three c-axis oriented thin films, showing that the upper critical field anisotropy ratio Hc2|| / Hc2perpendicular is 1.8 to 2.0, the ratio increasing with higher resistivity. Measurements of the magnetic field-temperature phase diagram show that flux pinning disappears at H*∼0.8Hc2perpendicular (T) in untextured samples. Hc2|| (0) is strongly enhanced by alloying to 39 T for the highest resistivity film, more than twice that seen in bulk samples. (author)

Availability note (English)

Available online at the Web site for the journal Superconductor Science and Technology (ISSN 1361-6668) http://www.iop.org/

Additional details

Identifiers

URL
http://www.iop.org/;

Publishing Information

Journal Title
Superconductor Science and Technology
Journal Volume
14
Journal Issue
6
Journal Page Range
p. 315-319
ISSN
0953-2048

INIS

Country of Publication
United Kingdom
Country of Input or Organization
Moldova, Republic of
INIS RN
43033531
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S36: MATERIALS SCIENCE;
Descriptors DEI
ANISOTROPY; CRYSTAL STRUCTURE; LAYERS; MAGNESIUM BORIDES; MAGNETIC FIELDS; PHASE DIAGRAMS; SUPERCONDUCTORS; TEMPERATURE DEPENDENCE
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; BORIDES; BORON COMPOUNDS; DIAGRAMS; INFORMATION; MAGNESIUM COMPOUNDS

Optional Information

Notes
30 refs; This record replaces 32029332