Unconventional superconductivity in the itinerant ferromagnet UGe2: 73Ge-NQR study under pressure

A. Harada, Shinji Kawasaki, H. Mukuda, Y. Kitaoka, Y. Haga, E. Yamamoto, Y. Onuki, K. M. Itoh, E. E. Haller, H. Harima

Research output: Contribution to journalArticle

Abstract

The superconducting characteristics on the itinerant ferromagnetic superconductor UGe2 have been investigated via the 73Ge-NQR measurements under pressure (P) near the critical pressure Px where the first-order transition takes place from the low-temperature (T) and low-P ferromagnetic phase (FM2) to high-T and high-P one (FM1). The measurements of nuclear spin-lattice relaxation rate 1 / T1 have revealed a power-law like behavior as Tn without the coherence peak, whereas at low temperatures, it deviates from the Tn dependence to a T-linear like behavior. These results that depend on the pressure are well understood in terms of non-unitary spin-triplet pairing state where the ferromagnetic up-spin band is gapped, but the down-spin band remains gapless at the Fermi level. We will argue an intimate relationship of the onset of SC with FM1 and FM2.

Original languageEnglish
Pages (from-to)963-964
Number of pages2
JournalPhysica B: Condensed Matter
Volume378-380
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - May 1 2006
Externally publishedYes

Fingerprint

Superconductivity
superconductivity
Spin-lattice relaxation
critical pressure
Fermi level
spin-lattice relaxation
nuclear spin
atomic energy levels
Superconducting materials
Temperature

Keywords

  • First-order phase transition
  • Itinerant ferromagnetism
  • Nonunitary state
  • NQR under pressure
  • UGe
  • Unconventional superconductivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Unconventional superconductivity in the itinerant ferromagnet UGe2 : 73Ge-NQR study under pressure. / Harada, A.; Kawasaki, Shinji; Mukuda, H.; Kitaoka, Y.; Haga, Y.; Yamamoto, E.; Onuki, Y.; Itoh, K. M.; Haller, E. E.; Harima, H.

In: Physica B: Condensed Matter, Vol. 378-380, No. SPEC. ISS., 01.05.2006, p. 963-964.

Research output: Contribution to journalArticle

Harada, A, Kawasaki, S, Mukuda, H, Kitaoka, Y, Haga, Y, Yamamoto, E, Onuki, Y, Itoh, KM, Haller, EE & Harima, H 2006, 'Unconventional superconductivity in the itinerant ferromagnet UGe2: 73Ge-NQR study under pressure', Physica B: Condensed Matter, vol. 378-380, no. SPEC. ISS., pp. 963-964. https://doi.org/10.1016/j.physb.2006.01.368
Harada, A. ; Kawasaki, Shinji ; Mukuda, H. ; Kitaoka, Y. ; Haga, Y. ; Yamamoto, E. ; Onuki, Y. ; Itoh, K. M. ; Haller, E. E. ; Harima, H. / Unconventional superconductivity in the itinerant ferromagnet UGe2 : 73Ge-NQR study under pressure. In: Physica B: Condensed Matter. 2006 ; Vol. 378-380, No. SPEC. ISS. pp. 963-964.
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AU - Haga, Y.

AU - Yamamoto, E.

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