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Heat-Capacity Measurements of Energy-Gap Nodes of the Heavy-Fermion Superconductor CeIrIn5 Deep inside the Pressure-Dependent Dome Structure of Its Superconducting Phase Diagram.

Authors :
Xin Lu
Hanoh Lee
Park, T.
Ronning, F.
Bauer, E. D.
Thompson, J. D.
Source :
Physical Review Letters. 1/13/2012, Vol. 108 Issue 2, p027001-1-027001-5. 5p.
Publication Year :
2012

Abstract

We use heat-capacity measurements as a function of field rotation to identify the nodal gap structure of CeIrIn5 at pressures to 2.05 GPa, deep inside its superconducting dome. A fourfold oscillation in the heat capacity at 0.3 K is observed for all pressures, but with its sign reversed between 1.50 and 0.90 GPa. On the basis of recent theoretical models for the field-angle-dependent specific heat, all data, including the sign reversal, imply a Due to image rights restrictions, multiple line equation(s) cannot be graphically displayed. order parameter with nodes along [110], which constrains theoretical models of the pairing mechanism in CeIrIn5. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00319007
Volume :
108
Issue :
2
Database :
Academic Search Index
Journal :
Physical Review Letters
Publication Type :
Academic Journal
Accession number :
71856040
Full Text :
https://doi.org/10.1103/PhysRevLett.108.027001