Phonon Echoes in Superconducting Amorphous Pd30Zr70
G. Weiss, B. Golding
DOI 10.1103/PhysRevLett.60.2547 · Physical Review Letters
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Abstract
Phonon echoes, the acoustic analog of spin or photon echoes, are observed in the superconducting (Tc=2.6 K) metallic glass Pd30Zr70 below 50 mK. The echo generation is attributed to the coherent tunneling of two-level systems of the amorphous structure. Compared to a normal conducting amorphous metal we observe a very small decay rate T1−1, which directly confirms the disappearance of an electronic relaxation channel for tunneling systems in the presence of a superconducting gap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pd30Zr70 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.6 | Pressure not reported | unknown |
| Cu65Zr35 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.1 | Pressure not reported | unknown |
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