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25 April 2024

» arxiv » 1111.5388

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Superconducting gap structure of CeIrIn5 determined by field-angle-resolved specific heat measurements
Shunichiro Kittaka ; Yuya Aoki ; Toshiro Sakakibara ; Akito Sakai ; Satoru Nakatsuji ; Yasumasa Tsutsumi ; Masanori Ichioka ; Kazushige Machida ;
Date:	23 Nov 2011
Abstract:	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, and the oscillation amplitude decreases monotonically by tilting the field 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).
Source:	arXiv, 1111.5388
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