Role of correlations in determining the Van Hove strain in 
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Barber, Mark E.; Lechermann, Frank; Streltsov, S. V.; Skornyakov, S. L.; Ghosh, Sayak; Ramshaw, B. J.; Kikugawa, Naoki; Sokolov, Dmitry; Mackenzie, Andrew P.; Hicks, Clifford W.; Mazin, I. I.

doi:10.1103/physrevb.100.245139

Cited by 51 publications

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“…The measured values of T c were used to calibrate the force sensors, following the stress dependence reported in ref. 29 . In addition, the generator incorporates a displacement sensor, and the force-displacement relationship of the sample can be monitored to check for mechanical damage to the sample, or the epoxy that holds the sample, as stress is applied.…”

Section: Methodsmentioning

confidence: 99%

“…Three samples (D-F) were measured under uniaxial stress. The uniaxial stress dependence of T c of Sr 2 RuO 4 is dominated by a stress-induced topological transition on a Fermi surface (a Lifshitz transition), which occurs at the stress σ = −0.70 GPa applied along the Ru-O-Ru bond direction 29,30 (negative values of stress denote compression). T c sharply peaks at this stress level, at 3.5 K, while the upper critical field is enhanced by a factor of 20 (ref.…”

Section: Strontium Ruthenate (Sr 2 Ruo 4 ) Continues To Present An Immentioning

confidence: 99%

“…Possible even-parity candidates are d + id, s + id and d + ig. The data are plotted againststress, which may be converted to strain using the low-temperature Young's modulus of 160 GPa (ref 29. ).…”

mentioning

confidence: 99%

“…). The insets illustrate the stress-induced changes in the Fermi surfaces of Sr 2 RuO 4 : the peak in T c occurs at approximately the stress at which the largest Fermi surface passes through a Lifshitz transition, at the Y point of the Brillouin zone29 . The displayed error bars correspond to the 10% and 90% criteria of the a.c. susceptibility signal change at the superconducting transition.…”

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Split superconducting and time-reversal symmetry-breaking transitions in Sr2RuO4 under stress

et al. 2021

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or most of its history, the superconductivity of strontium ruthenate (Sr 2 RuO 4) (ref. 1) has been understood in terms of an odd-parity two-component order parameter with equal-spin pairing in the RuO 2 planes: p x ± ip y (refs. 2-5). This order parameter is chiral: the Cooper pairs have angular momentum l = ±1. The evidence for chirality comes from the zero-field muon spin relaxation (ZF-μSR) data 6 , observation of a non-zero Kerr rotation below the critical temperature T c (ref. 7) and signs in the junction experiments of domains in the superconducting state 8,9 , while evidence for equal-spin pairing came from the absence of a change in the Knight shift below T c in nuclear magnetic resonance 10 and polarized neutron scattering 11 measurements. The Knight shift is related to the spin susceptibility; in conventional opposite-spin-pairing superconductors, it is suppressed below T c. However, in new measurements, it has been found that the Knight shift is, in fact, suppressed below T c (refs. 12-14), by a magnitude that is unlikely to be reconcilable with equal-spin pairing. This revision has called into question a number of other results on Sr 2 RuO 4. It raises a particular challenge for experiments that indicate chirality, because opposite-spin pairing implies an even-parity momentum-space gap structure. If the order parameter is constrained to be even parity, chiral, and composed of components that are degenerate on the tetragonal lattice of Sr 2 RuO 4 , the only possibility is d xz ± id yz order 15. Under conventional understanding, this is a highly unlikely order parameter because it

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Section: Methodsmentioning

confidence: 99%

Section: Strontium Ruthenate (Sr 2 Ruo 4 ) Continues To Present An Immentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Split superconducting and time-reversal symmetry-breaking transitions in Sr2RuO4 under stress

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“…However, the breaking of the fourfold axis should split the superconducting transition of the chiral state in contradiction with a single anomaly appearing in the specific heat under strain [12]. Furthermore, the strain dependence of the transition temperature close to zero strain is flat [10,13], whereas one expects a linear dependence for the chiral state.…”

Section: Introductionmentioning

confidence: 99%

Neutron scattering studies on spin fluctuations in Sr2RuO4

et al. 2021

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A Practical Method to Detect, Analyze, and Engineer Higher Order Van Hove Singularities in Multi‐band Hamiltonians

Chandrasekaran

Betouras

2023

Advanced Physics Research

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A practical method is presented to detect, diagnose, and engineer higher order Van Hove singularities in multiband systems, with no restrictions on the number of bands or hopping terms. The method allows us to directly compute the Taylor expansion of the dispersion of any band at arbitrary points in momentum space, using a generalized extension of the Feynman-Hellmann theorem, which is stated and proved. Being fairly, in general scope, it also allows to incorporate and analyze the effect of tuning parameters on the low energy dispersions, which can greatly aid the engineering of higher order Van Hove singularities. A certain class of degenerate bands can be handled within this framework. The use of this method is demonstrated, by applying it to the Haldane model.

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Role of correlations in determining the Van Hove strain in Sr2RuO4

Cited by 51 publications

References 31 publications

Split superconducting and time-reversal symmetry-breaking transitions in Sr2RuO4 under stress

Split superconducting and time-reversal symmetry-breaking transitions in Sr2RuO4 under stress

Neutron scattering studies on spin fluctuations in Sr2RuO4

A Practical Method to Detect, Analyze, and Engineer Higher Order Van Hove Singularities in Multi‐band Hamiltonians

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