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Magnetic susceptibility of the normal-superconducting transition in high-purity single-crystal alpha-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
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Abstract

We report complex ac magnetic susceptibility measurements of a superconducting transition in very high-quality single-crystal alpha-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 YBCO sample, indicates that the 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.

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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. 2002-08-26. Magnetic susceptibility of the normal-superconducting transition in high-purity single-crystal alpha-uranium. https://doi.org/10.1103/physrevb.66.064523

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