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Paper detail

Superconducting gap structure of CeIrIn5 from field-angle-resolved measurements of its specific heat

In order to identify the gap structure of CeIrIn5, we measured field-angle-resolved specific heat C(phi) by conically rotating the magnetic field H around the c axis at low temperatures down to 80 mK. We revealed that C(phi) 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 dx2-y2-wave gap. These results strongly indicate that CeIrIn5 is a dx2-y2-wave superconductor and suggest the universal pairing mechanism in CeMIn5 (M = Co, Rh, and Ir).

preprint2012arXivOpen access
Shunichiro KittakaYuya AokiToshiro SakakibaraAkito SakaiSatoru NakatsujiYasumasa TsutsumiMasanori IchiokaKazushige Machida
cond-mat.supr-concond-mat.str-el
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Shunichiro KittakaYuya AokiToshiro SakakibaraAkito SakaiSatoru NakatsujiYasumasa TsutsumiMasanori IchiokaKazushige Machida

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