Superconducting gap structure of CeIrIn 5 from field-angle-resolved measurements of its specific heat

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

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


In order to identify the gap structure of CeIrIn 5, we measured field-angle-resolved specific heat C(φ) by conically rotating the magnetic field H around the c axis at low temperatures down to 80 mK. We revealed that C(φ) exhibits a fourfold angular oscillation, whose amplitude decreases monotonically by tilting H out of the ab plane. Detailed microscopic calculations based on the quasiclassical Eilenberger equation confirm that the observed features are uniquely explained by assuming the d x2-y2-wave gap. These results strongly indicate that CeIrIn 5 is a d x2-y2-wave superconductor and suggest the universal pairing mechanism in CeMIn 5 (M=Co, Rh, and Ir).

Original languageEnglish
Article number060505
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number6
Publication statusPublished - Feb 23 2012

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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