Penetration depth measurements in HoNi2B2C: Competition between superconducting and magnetic order

Elbert E.M. Chia, I. Bonalde, Brian D. Yanoff, D. J. Van Harlingen, M. B. Salamon, Sung Ik Lee, Heon Jung Kim

Research output: Contribution to journalArticle

Abstract

We report measurements of the magnetic penetration depth in single crystals of HoNi2B2C down to 100mK using a tunnel-diode-based, self-inductive technique at 28 MHz. We observe a sharp decrease in the RF penetration depth λ(T) at the superconducting transition near 9 K. A pronounced shoulder appears at approximately 8 K, followed by dramatic increases in λ(T) at 5.7 and 5.2 K. These increases correspond approximately to the onsets of previously reported, magnetic structures. Just below the 5.2 K peak, λ(T) drops abruptly, suggesting a reentrant superconducting state. Below 3 K, λ(T) increases gradually to a broad maximum near 1K, then decreases again. In addition, three previously unreported, smaller transitions are observed between 1.7 and 2.5 K. It appears that the c-axis helical phase inhibits the increase in the density of Cooper pairs, but does not destroy superconductivity. Magnetization data of HoNi2B2C are also presented for comparison.

Original languageEnglish (US)
Pages (from-to)301-303
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume226-230
Issue numberPART I
DOIs
StatePublished - Jan 1 2001

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Keywords

  • Magnetic ordering
  • Magnetic penetration depth
  • Superconductivity-magnetic

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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