Bulk Magnetization in the Superconducting State of UPt$_3$

ORAL

Abstract

The unconventional superconductor UPt$_3$ has long been thought to have an odd parity orbital, and triplet spin state. An important signature of such a state is the temperature independence of the spin susceptibility across the superconducting transition temperature. Here, we report bulk measurements of the susceptibility of UPt$_3$ for magnetic fields along the crystal a-axis performed with polarized neutron diffraction. Temperature independence at all magnetic fields is observed, suggesting a spin triplet superconducting state for the entirety of the phase diagram, with equal spin pairs in the crystal basal plane. These results will be discussed in the context of existing theories for the superconducting state of this paradigm heavy fermion material [Graf et. al., PRB 62, 14393; Tsutsumi et. al., JPSJ 81, 074717 (2012)].

*Support from US Department of Energy, Basic Energy Science, Division of Materials Science and Engineering awards DE-FG02-05ER46248, DE-FG02-10ER46783, and DE-FG02-05ER46202

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Authors

  • William Gannon

    • Northwestern University, Department of Physics and Astronomy, USA

  • William Halperin

    • Northwestern University, Department of Physics and Astronomy, USA

  • Catherine Rastovski

    • University of Notre Dame, Department of Physics, USA

  • Morten Eskildsen

    • University of Notre Dame, Department of Physics, USA

  • Pengcheng Dai

    • University of Tennessee, Department of Physics and Astronomy, USA

  • Anne Stunault

    • Institut Max von Laue-Paul Langevin, France