Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn5

Yuya Aoki, Shunichiro Kittaka, Toshiro Sakakibara, Akito Sakai, Satoru Nakatsuji, Yasumasa Tsutsumi, Masanori Ichioka, Kazushige Machida

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1 Citation (Scopus)

Abstract

We investigated temperature, field, and field-orientation dependences of the specific heat of CeIrIn5. The upper critical field Hc2 was determined down to 80 mK from the specific heat measurements and exhibits a slight suppression at low temperatures. We revealed that the specific heat at 80 mK increases proportional to the square root of H up to nearly Hc2 for both H ∥ ab and H ∥ c, implying the presence of line nodes and a weak contribution of the Pauli paramagnetic pair-breaking effect. Furthermore, we revealed that the specific heat shows a fourfold oscillation under a rotating magnetic field in the ab plane. This result indicates that CeIrIn 5has fourfold symmetry around the c axis in its gap amplitude.

Original languageEnglish
Article numberSB014
Journaljournal of the physical society of japan
Volume81
Issue numberSUPPL.B
DOIs
Publication statusPublished - Sep 2012

Keywords

  • Heavy fermion
  • Specific heat
  • Superconducting gap
  • Superconductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Aoki, Y., Kittaka, S., Sakakibara, T., Sakai, A., Nakatsuji, S., Tsutsumi, Y., Ichioka, M., & Machida, K. (2012). Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn5. journal of the physical society of japan, 81(SUPPL.B), [SB014]. https://doi.org/10.1143/JPSJS.81SB.SB014