Pressure-induced change of the pairing symmetry in superconducting CeCu2Si2
E. Lengyel, M. Nicklas, H. S. Jeevan, G. Sparn, C. Geibel, F. Steglich, Y. Yoshioka, K. Miyake
DOI 10.1103/PhysRevB.80.140513 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Low-temperature (T) heat-capacity measurements under hydrostatic pressure of up to p≈2.1 GPa have been performed on single-crystalline CeCu2Si2. A broad superconducting (SC) region exists in the T−p phase diagram. In the low-pressure region antiferromagnetic spin fluctuations and in the high-pressure region valence fluctuations had previously been proposed to mediate Cooper pairing. We could identify these two distinct SC regions. We found different thermodynamic properties of the SC phase in both regions, supporting the proposal that different mechanisms might be implied in the formation of superconductivity. We suggest that different SC order parameters are characterizing the two distinct SC regions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.46 | Pressure unresolved | onset |
| CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.63 | 0.4 GPa | unknown |
| CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.59 | 1.5 GPa | unknown |
| LaCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CePd2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 2.8 GPa | unknown |
Similar papers
Pairing symmetry in two distinct superconducting states of CeCu2Si2
similarity 0.97M. Ishikawa et al.
Source status unknown — claims are unverified
Thermodynamic study of gap structure and pair-breaking effect by magnetic field in the heavy-fermion superconductor CeCu2Si2
similarity 0.96Shunichiro Kittaka et al.
Source status unknown — claims are unverified
Pressure Tuning of the Interplay of Magnetism and Superconductivity in CeCu2Si2
similarity 0.96E. Lengyel et al.
Source status unknown — claims are unverified
Competition between magnetism and superconductivity in CeCu2Si2
similarity 0.95R. Feyerherm et al.
Source status unknown — claims are unverified
Critical fluctuation effects near the normal-metal–superconductor phase transition at low temperatures
similarity 0.94V. P. Mineev & M. Sigrist
Source status unknown — claims are unverified
Spin-density waves and the superconductivity dome in heavy electron systems with nested Fermi surfaces
similarity 0.93P. Schlottmann
Source status unknown — claims are unverified