Pressure-enhanced f-electron orbital weighting in UTe2 mapped by quantum interferometry
arxiv(2024)
摘要
The phase landscape of UTe_2 features a remarkable diversity of
superconducting phases under applied pressure and magnetic field. Recent
quantum oscillation studies at ambient pressure have revealed the quasi-2D
Fermi surface of this material. However, the pressure-dependence of the Fermi
surface remains an open question. Here we track the evolution of the UTe_2
Fermi surface as a function of pressure up to 19.5 kbar by measuring quantum
interference oscillations. We find that in sufficient magnetic field to
suppress both superconductivity at low pressures and incommensurate
antiferromagnetism at higher pressures, the quasi-2D Fermi surface found at
ambient pressure smoothly connects to that at 19.5 kbar, with no signs of a
reconstruction over this pressure interval. The warping of the cylindrical
Fermi sheets continuously increases with pressure, which is consistent with
increased f-orbital contribution at the Fermi level, up to and beyond the
critical pressure at which superconductivity is truncated. These findings
highlight the value of high pressure quantum interference measurements as a new
probe of the electronic structure in heavy fermion materials.
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