Anomalous Change in the Field Dependence of the Electronic Specific Heat of an Electron-Doped Cuprate Superconductor
Hamza Balci, R. L. Greene
DOI 10.1103/PhysRevLett.93.067001 · Physical Review Letters
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Abstract
We present specific heat measurements on Pr2−xCexCuO4−δ single crystals which show an unexpected change in the field dependence of the electronic specific heat (Cel) from linear at T=2 K to nonlinear at T≥3 K. We consider several possible explanations for this change and propose, as a possible interpretation, a phase transition in the symmetry of the order parameter from nodal (e.g., d wave) at T≥3 K to gapped (e.g., s wave) at T=2 K. Such a phase transition could be an explanation for the previous conflicting experimental results on the pairing symmetry in the electron-doped cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr2-xCexCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | unknown |
| Pr2-xCexCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
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