Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session Y51: Topological Superconductivity: Pnictides and Heavy Fermion Materials
11:30 AM–1:54 PM,
Friday, March 19, 2021
Sponsoring
Unit:
DMP
Chair: Ady Stern, Weizmann Institute of Science
Abstract: Y51.00002 : UTe2: a nearly insulating half-filled j=5/2, 5f3 heavy fermion metal.*
11:42 AM–11:54 AM
Live
Presenter:
Alexander Shick
(Condensed Matter Theory, Institute of Physics, Czech Academy of Sciences)
Authors:
Alexander Shick
(Condensed Matter Theory, Institute of Physics, Czech Academy of Sciences)
Shin-ichi Fujimori
(Materials Sciences Research Center, Japan Atomic Energy Agency)
Warren Pickett
(Department of Physics, University of California Davis)
density functional theory with exact diagonalization of the Anderson
impurity model [DFT+U(ED)] is applied to UTe2.
The small gap for U=0, is converted for U=3 eV to a flat band
semimetal with small heavy-carrier Fermi surfaces that will make properties sensitive to
pressure, magnetic field, and off-stoichiometry, as observed experimentally.
The Green's function identification gives a mass enhancement
of the order of 12 for already heavy (flat) bands,
consistent with the common heavy fermion characterization of UTe2. The
predicted Kondo temperature around 100 K matches the experimental values.
The calculated uranium moment <M2>1/2 of
3.5 μB is consistent with the experimental Curie-Weiss values.
The U=3 eV electronic structure is compared
with angle-integrated and angle-resolved photoemission spectra, with
agreement that there is strong
5f character at, and for several hundred meV below, the Fermi energy.
UTe2 displays similarities to UPt3 with its 5f dominated Fermi
surfaces rather than a strongly localized Kondo lattice system.
*
Support from SOLID21-CZ.02.1.01/0.0/0.0/16_019/0000760,
GACR 18-06240S, JSPS KAKENHI JP15H05882, JP15H05884,
JP15H05745, JP15K21732, JP16H01084, JP16H04006,
JP18K03553, JP19H00646, NSF DMR 1607139 grants is acknowledged.
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