Magnetic susceptibility of the normal-superconducting transition in high-purity single-crystal α-uranium

J. L. O’Brien; A. R. Hamilton; R. G. Clark; C. H. Mielke; J. L. Smith; J. C. Cooley; D. G. Rickel; R. P. Starrett; D. J. Reilly; N. E. Lumpkin; R. J. Hanrahan, Jr.; W. L. Hults

doi:10.1103/PhysRevB.66.064523

Magnetic susceptibility of the normal-superconducting transition in high-purity single-crystal α-uranium

J. L. O’Brien, A. R. Hamilton, R. G. Clark, C. H. Mielke, J. L. Smith, J. C. Cooley, D. G. Rickel, R. P. Starrett, D. J. Reilly, N. E. Lumpkin, R. J. Hanrahan, Jr., W. L. Hults

DOI 10.1103/PhysRevB.66.064523 · Physical Review B

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Abstract

We report complex ac magnetic susceptibility measurements of a superconducting transition in very high-quality single-crystal α-uranium using microfabricated coplanar magnetometers. We identify an onset of superconductivity at T≈0.7 K in both the real and imaginary components of the susceptibility which is confirmed by resistivity data. A superconducting volume fraction argument, based on a comparison with a calibration YBa2Cu3O7−δ sample, indicates that superconductivity in these samples may be filamentary. Our data also demonstrate the sensitivity of the coplanar micro-magnetometers, which are ideally suited to measurements in pulsed magnetic fields exceeding 100 T.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95	Pressure unresolved	onset