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Physical Review BVolume 10, Issue 24, 23 December 2019, Article number 245139

Role of correlations in determining the Van Hove strain in Sr2 RuO4(Article)(Open Access)

  • Barber, M.E.,
  • Lechermann, F.,
  • Streltsov, S.V.,
  • Skornyakov, S.L.,
  • Ghosh, S.,
  • Ramshaw, B.J.,
  • Kikugawa, N.,
  • Sokolov, D.A.,
  • MacKenzie, A.P.,
  • Hicks, C.W.,
  • Mazin, I.I.
  Save all to author list
  • aMax Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, Dresden, 01187, Germany
  • bI. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, Hamburg, 20355, Germany
  • cInstitute of Metal Physics, S. Kovalevskaya Street 18, Ekaterinburg, 620990, Russian Federation
  • dDepartment of Theoretical Physics and Applied Mathematics, Ural Federal University, Mira Street 19, Ekaterinburg, 620002, Russian Federation
  • eLaboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853, United States
  • fNational Institute for Materials Science, Tsukuba, Ibaraki, 305-0003, Japan
  • gScottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. Andrews, KY16 9SS, United Kingdom
  • hCenter for Computational Materials Science, U.S. Naval Research Laboratory, Washington, D.C., 20375, United States

Abstract

Uniaxial pressure applied along a Ru-O-Ru bond direction induces an elliptical distortion of the largest Fermi surface of Sr2RuO4, eventually causing a Fermi surface topological transition, also known as a Lifshitz transition, into an open Fermi surface. There are various anomalies in low-temperature properties associated with this transition, including maxima in the superconducting critical temperature and in resistivity. In the present paper, we report refined measurements of the strain at which this transition occurs, employing apparatus in which the stress on the sample is measured, and resonant ultrasound measurement of the low-temperature elastic moduli. The Lifshitz transition is found to occur at a longitudinal strain Exx of (-0.44±0.06)×10-2, which corresponds to a B1g strain Exx-Eyy of (-0.66±0.09)×10-2. This is considerably smaller than the strain corresponding to a Lifshitz transition in density functional theory calculations, even if the spin-orbit coupling is taken into account. Using dynamical mean-field theory, we show that electronic correlations reduce the critical strain. It turns out that the orbital anisotropy of the local Coulomb interaction on the Ru site is, furthermore, important to bring this critical strain close to the experimental number and thus well into the experimentally accessible range of strains. © 2019 American Physical Society.

Indexed keywords

Engineering controlled terms:Density functional theoryFermi surfaceMean field theoryTemperature
Engineering uncontrolled termsDynamical mean-field theoryElectronic correlationLifshitz transitionLongitudinal strainSpin-orbit couplingsSuperconducting critical temperaturesTopological transitionsUltrasound measurement
Engineering main heading:Strain

Funding details

Funding sponsor Funding number Acronym
National Science Foundation
See opportunities by NSF		NSF
Office of Naval Research
See opportunities by ONR		ONR
Directorate for Mathematical and Physical Sciences
See opportunities by MPS		1752784MPS
U.S. Naval Research LaboratoryNRL
Deutsche Forschungsgemeinschaft
See opportunities by DFG		DFG
Japan Society for the Promotion of Science
See opportunities by KAKEN		JP18K04715KAKEN
Max-Planck-GesellschaftMPG
Ministry of Science and Higher Education of the Russian Federation02.,AAAA-A18-118020190095-4

  • 1

    We acknowledge the support of the Max Planck Society. F.L. was supported by the DFG under Project No. LE-2446/4-1. S.V.S. and S. L. S.'s work was supported by the Russian Ministry of Science and High Education through program AAAA-A18-118020190095-4 (“Quantum”) and Contract No. 02.A03.21.0006, as well as UD RAS via Project No. 18-10-2-37. B.J.R. and S.G. were supported by the National Science Foundation under Grant No. DMR-1752784. N.K. acknowledges the support from JSPS KAKENHI (Grant No. JP18K04715) and the JST-Mirai Program (Grant No. JPMJMI18A3) in Japan. I.I.M. was supported by ONR through the NRL basic research program. The authors are thankful to H. Rosner for many useful discussions and for providing the crystal structures fully optimized as a function of strain in Ref.  [2] .

  • ISSN: 24699950
  • Source Type: Journal
  • Original language: English
  • DOI: 10.1103/PhysRevB.100.245139
  • Document Type: Article
  • Publisher: American Physical Society


© Copyright 2020 Elsevier B.V., All rights reserved.

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