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  Role of correlations in determining the Van Hove strain in Sr2RuO4

Barber, M. E., Lechermann, F., Streltsov, S. V., Skornyakov, S. L., Ghosh, S., Ramshaw, B. J., et al. (2019). Role of correlations in determining the Van Hove strain in Sr2RuO4. Physical Review B, 100(24): 245139, pp. 1-7. doi:10.1103/PhysRevB.100.245139.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-7261-D Version Permalink: http://hdl.handle.net/21.11116/0000-0005-7265-9
Genre: Journal Article

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 Creators:
Barber, Mark E.1, Author              
Lechermann, Frank2, Author
Streltsov , Sergey V.2, Author
Skornyakov, Sergey L.2, Author
Ghosh, Sayak2, Author
Ramshaw, B. J.2, Author
Kikugawa, Naoki2, Author
Sokolov, Dmitry A.1, Author              
Mackenzie, Andrew P.3, Author              
Hicks, Clifford W.4, Author              
Mazin, I. I.2, Author
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              
3Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              
4Clifford Hicks, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863466              

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 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 epsilon(xx) of (-0.44 +/- 0.06) x 10(-2), which corresponds to a B-1g strain epsilon(xx) - epsilon(yy) of (-0.66 +/- 0.09) x 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.

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Language(s): eng - English
 Dates: 2019-12-232019-12-23
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 100 (24) Sequence Number: 245139 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008