Physics – Condensed Matter – Superconductivity
Scientific paper
2011-11-23
Phys. Rev. B 85, 060505(R) (2012)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, Selected for an Editors' Suggestion and a Synopsis in Physics
Scientific paper
10.1103/PhysRevB.85.060505
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).
Aoki Yuya
Ichioka Masanori
Kittaka Shunichiro
Machida Kazushige
Nakatsuji Satoru
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