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Multiband Superconductivity with Unexpected Deficiency of Nodal Quasiparticles in CeCu2Si2.
- Source :
-
Physical Review Letters . 2/14/2014, Vol. 112 Issue 6, p067002-1-067002-5. 5p. - Publication Year :
- 2014
-
Abstract
- Superconductivity in the heavy-fermion compound CeCu2Si2 is a prototypical example of Cooper pairs formed by strongly correlated electrons. For more than 30 years, it has been believed to arise from nodal d-wave pairing mediated by a magnetic glue. Here, we report a detailed study of the specific heat and magnetization at low temperatures for a high-quality single crystal. Unexpectedly, the specific-heat measurements exhibit exponential decay with a two-gap feature in its temperature dependence, along with a linear dependence as a function of magnetic field and the absence of oscillations in the field angle, reminiscent of multiband full-gap superconductivity. In addition, we find anomalous behavior at high fields, attributed to a strong Pauli paramagnetic effect. A low quasiparticle density of states at low energies with a multiband Fermi-surface topology would open a new door into electron pairing in CeCu2Si2. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SUPERCONDUCTIVITY
*QUASIPARTICLES
*CERIUM compounds
*CALORIMETRY
*PARAMAGNETISM
Subjects
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 112
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 94790889
- Full Text :
- https://doi.org/10.1103/PhysRevLett.112.067002