Abstract
We investigated temperature, field, and field-orientation dependences of the specific heat of CeIrIn5. The upper critical field Hc2 was determined down to 80 mK from the specific heat measurements and exhibits a slight suppression at low temperatures. We revealed that the specific heat at 80 mK increases proportional to the square root of H up to nearly Hc2 for both H ∥ ab and H ∥ c, implying the presence of line nodes and a weak contribution of the Pauli paramagnetic pair-breaking effect. Furthermore, we revealed that the specific heat shows a fourfold oscillation under a rotating magnetic field in the ab plane. This result indicates that CeIrIn 5has fourfold symmetry around the c axis in its gap amplitude.
Original language | English |
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Article number | SB014 |
Journal | journal of the physical society of japan |
Volume | 81 |
Issue number | SUPPL.B |
DOIs | |
Publication status | Published - Sep 2012 |
Keywords
- Heavy fermion
- Specific heat
- Superconducting gap
- Superconductor
ASJC Scopus subject areas
- Physics and Astronomy(all)