Superconducting Energy Gap Observed in the Magnetic Excitation Spectra of a Heavy Fermion Superconductor UPd2Al3
Naoto Metoki, Yoshinori Haga, Yoshihiro Koike, Yoshichika O¯nuki
DOI 10.1103/PhysRevLett.80.5417 · Physical Review Letters
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Abstract
High resolution neutron scattering experiments have been carried out in order to study the interplay between magnetism and superconductivity in the heavy fermion superconductor UPd2Al3. We found direct evidence for a magnetic excitation gap associated with superconductivity. We observed 1% suppression of the antiferromagnetic Bragg intensities below the superconducting transition temperature Tc=1.9K. We also observed the increases of the spin wave excitation energy and its linewidth in the superconducting state. These results indicate a strong coupling between magnetism and superconductivity in this compound.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UPd2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.9 | Pressure not reported | onset |
| UPd2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.95 | Pressure not reported | zero_resistance |
| UPd2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.85 | Pressure not reported | midpoint |
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