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Microwave properties of borocarbide superconductors {ital R}Ni{sub 2}B{sub 2}C ({ital R}=Y,Er,Tm,Ho)

Journal Article · · Physical Review, B: Condensed Matter
; ;  [1]; ; ; ;  [2]; ;  [3]
  1. Physics Department, Northeastern University, Boston, Massachusetts 02115 (United States)
  2. Tata Institute of Fundamental Research, Colaba, Bombay (India)
  3. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa (United States)
+ Show Author Affiliations
We report measurements of the microwave surface impedance of the borocarbide family of superconductors {ital R}Ni{sub 2}B{sub 2}C ({ital R}=Y,Er,Tm,Ho). The experiments enable direct measurements of the superfluid density, and are particularly sensitive to the influence of magnetic pair breaking. In HoNi{sub 2}B{sub 2}C the antiferromagnetic transition is clearly observed at zero field, and leads to a drastic reduction of the superfluid density, which recovers at lower temperatures. In ErNi{sub 2}B{sub 2}C the antiferromagnetic transition is not seen in zero-field data. Magnetic effects are responsible for anomalies in the low-temperature surface impedance below approximately 4 K in HoNi{sub 2}B{sub 2}C and TmNi{sub 2}B{sub 2}C. The temperature dependence of the microwave impedance disagrees with BCS calculations.
Research Organization:
Ames National Laboratory
DOE Contract Number:
W-7405-ENG-82
OSTI ID:
115848
Journal Information:
Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
ANTIFERROMAGNETISM
BCS THEORY
BORON CARBIDES
ERBIUM CARBIDES
HOLMIUM CARBIDES
IMPEDANCE
MAGNETIC FIELDS
MICROWAVE RADIATION
NICKEL CARBIDES
SUPERCONDUCTORS
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THULIUM CARBIDES
YTTRIUM CARBIDES