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

Research output: Contribution to journalArticle

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
Publication statusPublished - Sep 2012

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heavy fermion superconductors
specific heat
temperature distribution
heat measurement
retarding
oscillations
symmetry
magnetic fields

Keywords

  • CeIrIn
  • Heavy fermion
  • Specific heat
  • Superconducting gap
  • Superconductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Aoki, Y., Kittaka, S., Sakakibara, T., Sakai, A., Nakatsuji, S., Tsutsumi, Y., ... 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].

Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn5. / Aoki, Yuya; Kittaka, Shunichiro; Sakakibara, Toshiro; Sakai, Akito; Nakatsuji, Satoru; Tsutsumi, Yasumasa; Ichioka, Masanori; Machida, Kazushige.

In: Journal of the Physical Society of Japan, Vol. 81, No. SUPPL.B, SB014, 09.2012.

Research output: Contribution to journalArticle

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, vol. 81, no. SUPPL.B, SB014.
Aoki Y, Kittaka S, Sakakibara T, Sakai A, Nakatsuji S, Tsutsumi Y et al. Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn5. Journal of the Physical Society of Japan. 2012 Sep;81(SUPPL.B). SB014.
Aoki, Yuya ; Kittaka, Shunichiro ; Sakakibara, Toshiro ; Sakai, Akito ; Nakatsuji, Satoru ; Tsutsumi, Yasumasa ; Ichioka, Masanori ; Machida, Kazushige. / Field dependence of the specific heat in a heavy-fermion superconductor CeIrIn5. In: Journal of the Physical Society of Japan. 2012 ; Vol. 81, No. SUPPL.B.
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