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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