Physics – Condensed Matter – Superconductivity
Scientific paper
2012-02-22
Physics
Condensed Matter
Superconductivity
12 pages, 4 figures
Scientific paper
High resolution longitudinal sound velocity measurements in a magnetic field performed in the temperature tending to zero limit reveal two distinct signatures attributable to multiple superconducting phases in URu2Si2. A step change in the sound velocity, for propagation in the basal plane, is observed at the critical field, Bc2. This step broadens considerably as T tends to Tc with a concomitant decrease in magnitude. A second step is observed at a field ~0.5 Bc2 and it's magnitude remains constant at all temperatures. Inductive measurements of the transitions in a magnetic field, however, exhibit a single signature which coincides with the lower step with no discernible in-phase signature at the upper transition. Measurements performed with B oriented at various angles between the a and c-axes reveal a weaker angular dependence of the lower step and confirm the rapid fall off of Bc2 close to B||c-axis. An off axis superconducting phase diagram is proposed.
Hinks D. G.
Shivaram B. S.
Ulrich V. W.
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