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 journalArticle

11 Citations (Scopus)

Abstract

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
Volume85
Issue number6
DOIs
Publication statusPublished - Feb 23 2012

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Angle measurement
Specific heat
specific heat
Superconducting materials
Magnetic fields
oscillations
magnetic fields
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Superconducting gap structure of CeIrIn 5 from field-angle-resolved measurements of its specific heat. / Kittaka, Shunichiro; Aoki, Yuya; Sakakibara, Toshiro; Sakai, Akito; Nakatsuji, Satoru; Tsutsumi, Yasumasa; Ichioka, Masanori; Machida, Kazushige.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 6, 060505, 23.02.2012.

Research output: Contribution to journalArticle

Kittaka, Shunichiro ; Aoki, Yuya ; Sakakibara, Toshiro ; Sakai, Akito ; Nakatsuji, Satoru ; Tsutsumi, Yasumasa ; Ichioka, Masanori ; Machida, Kazushige. / Superconducting gap structure of CeIrIn 5 from field-angle-resolved measurements of its specific heat. In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 85, No. 6.
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