Tetracritical Points and the Superconducting Phases of UPt3: Uniaxial Pressure Effects
M. Boukhny, G. L. Bullock, B. S. Shivaram, David G. Hinks
DOI 10.1103/PhysRevLett.73.1707 · Physical Review Letters
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Abstract
Using signatures in the longitudinal sound velocity we have mapped for the first time experimentally the pressure dependence of the phase boundaries in superconducting UPt3 for magnetic field H parallel to the a axis. With increasing pressure Pc parallel to the c axis, the tetracritical point in the H−T plane is observed to shift to lower H and higher temperature T. At a critical stress, Pc∼2.6 kbar the tetracritical point reaches the H=0, Pc−T plane, and our measurements prove coexistence of at least four phases in this plane as well.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.5 | Pressure unresolved | midpoint |
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