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Microscopic Imaging Homogeneous and Single Phase Superfluid Density in UTe_{2}.

Yusuke Iguchi1,2, Huiyuan Man1,3, S M Thomas4

  • 1Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA.

Physical Review Letters
|May 27, 2023
PubMed
Summary
This summary is machine-generated.

Researchers observed homogeneous superfluid density in the superconductor UTe2, revealing a hidden internal field and enhanced transition temperatures at edges. This challenges previous theories of multiple superconducting phases and chiral superconductivity in UTe2.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity Research
  • Materials Science

Background:

  • The superconductor Uranium Ditelluride (UTe2) exhibits spontaneous time-reversal symmetry breaking and multiple superconducting phases in some samples, suggesting chiral superconductivity.
  • However, these phenomena are not consistently observed across all UTe2 samples, leading to ongoing debate about its superconducting nature.

Purpose of the Study:

  • To microscopically investigate the superconducting properties of UTe2, focusing on superfluid density and transition temperatures.
  • To clarify the existence and nature of chiral superconductivity and multiple superconducting phases in UTe2.
  • To identify the origin of the hidden internal field suggested by previous studies.

Main Methods:

  • Microscopic observation of superfluid density (n_s) on the UTe2 surface.
  • Measurement of superconducting transition temperatures, particularly near sample edges.
  • Detection of vortex-antivortex pairs at zero magnetic field.
  • Analysis of the temperature dependence of n_s, independent of sample geometry.

Main Results:

  • A homogeneous superfluid density (n_s) was observed across the UTe2 surface.
  • Superconducting transition temperatures were found to be enhanced near the edges of UTe2 samples.
  • Vortex-antivortex pairs were detected even in the absence of an external magnetic field, indicating an intrinsic internal field.
  • The temperature dependence of n_s does not support the presence of point nodes along the b axis for a quasi-2D Fermi surface.

Conclusions:

  • The findings suggest a homogeneous superconducting state in UTe2, challenging theories requiring inhomogeneity for certain phenomena.
  • The observed internal field and edge effects provide new insights into the complex physics of UTe2 superconductivity.
  • The data do not support multiple superconducting phase transitions or point nodes along the b axis, necessitating a re-evaluation of existing models for UTe2.