skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Rotational tuning of H{sub c2} anomalies in ErNi{sub 2}B{sub 2}C: Angular-dependent superzone gap formation and its effect on the superconducting ground state

Abstract

ErNi{sub 2}B{sub 2}C is a member of the RNi{sub 2}B{sub 2}C family of magnetic superconductors, with T{sub c}{approx_equal}11 K and T{sub N}{approx_equal}6 K. For magnetic fields applied along the magnetically hard c axis, the upper critical field H{sub c2} manifests a clear, sharp local maximum at T{sub N}. For magnetic fields applied within the basal plane, features in H{sub c2} are less distinct and there are field induced changes in the local magnetic ordering. In order to address the relationship between H{sub c2} and local moment order, anisotropic magnetic and transport measurements on single crystals of ErNi{sub 2}B{sub 2}C will be presented. In particular, detailed H-T phase diagrams for different orientations of the applied field, as well as possible evidence of a superzone gap formation at the antiferromagnetic phase transition and its effect on anisotropic upper critical field, will be discussed. The anomaly in H{sub c2} as well as sharp features in the normal-state resistivity can be tuned by changing the orientation of the applied field. This is consistent with tuning in and out of the 0.55a* magnetically ordered, superzone gapped phase. (c) 2000 The American Physical Society.

Authors:
 [1];  [1]
  1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
Publication Date:
OSTI Identifier:
20216782
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 22; Other Information: PBD: 1 Jun 2000; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRITICAL FIELD; SUPERCONDUCTIVITY; ERBIUM CARBIDES; ERBIUM BORIDES; NICKEL BORIDES; NICKEL CARBIDES; ENERGY GAP; MAGNETIC MOMENTS; ANTIFERROMAGNETIC MATERIALS; GROUND STATES; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Bud'ko, Sergey L., and Canfield, Paul C. Rotational tuning of H{sub c2} anomalies in ErNi{sub 2}B{sub 2}C: Angular-dependent superzone gap formation and its effect on the superconducting ground state. United States: N. p., 2000. Web. doi:10.1103/PhysRevB.61.R14932.
Bud'ko, Sergey L., & Canfield, Paul C. Rotational tuning of H{sub c2} anomalies in ErNi{sub 2}B{sub 2}C: Angular-dependent superzone gap formation and its effect on the superconducting ground state. United States. doi:10.1103/PhysRevB.61.R14932.
Bud'ko, Sergey L., and Canfield, Paul C. Thu . "Rotational tuning of H{sub c2} anomalies in ErNi{sub 2}B{sub 2}C: Angular-dependent superzone gap formation and its effect on the superconducting ground state". United States. doi:10.1103/PhysRevB.61.R14932.
@article{osti_20216782,
title = {Rotational tuning of H{sub c2} anomalies in ErNi{sub 2}B{sub 2}C: Angular-dependent superzone gap formation and its effect on the superconducting ground state},
author = {Bud'ko, Sergey L. and Canfield, Paul C.},
abstractNote = {ErNi{sub 2}B{sub 2}C is a member of the RNi{sub 2}B{sub 2}C family of magnetic superconductors, with T{sub c}{approx_equal}11 K and T{sub N}{approx_equal}6 K. For magnetic fields applied along the magnetically hard c axis, the upper critical field H{sub c2} manifests a clear, sharp local maximum at T{sub N}. For magnetic fields applied within the basal plane, features in H{sub c2} are less distinct and there are field induced changes in the local magnetic ordering. In order to address the relationship between H{sub c2} and local moment order, anisotropic magnetic and transport measurements on single crystals of ErNi{sub 2}B{sub 2}C will be presented. In particular, detailed H-T phase diagrams for different orientations of the applied field, as well as possible evidence of a superzone gap formation at the antiferromagnetic phase transition and its effect on anisotropic upper critical field, will be discussed. The anomaly in H{sub c2} as well as sharp features in the normal-state resistivity can be tuned by changing the orientation of the applied field. This is consistent with tuning in and out of the 0.55a* magnetically ordered, superzone gapped phase. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevB.61.R14932},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 22,
volume = 61,
place = {United States},
year = {2000},
month = {6}
}