Stress-Induced Electronic Transition (2.5 Order) in Al

Overcash, D. R.; Davis, Tracy; Cook, J. W.; Skove, M. J.

doi:10.1103/physrevlett.46.287

Cited by 28 publications

(10 citation statements)

References 12 publications

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“…where α is a constant parameter adjusting the scale of the effect of the strain. For numerical calculations, we use the hopping matrix elements t 0 /t = 0.8, t 0 /t = 0.3, the bare chemical potential µ 0 /t = 1.1, α = 10 and ν xy = −0.39, where t = 0.14 eV is the nearest-neighbor-hopping strength of the α-band of Sr 2 RuO 4 grown on SrTiO 3 17 . For the Hall resistivity, we use a magnetic field in the dimensionless units B z = (2π) 3 ea 2 B z , with the value B z = 0.1.…”

Section: Appendix A: Model For the γ Band Of Sr 2 Ruomentioning

confidence: 99%

Deviation from Fermi-liquid transport behavior in the vicinity of a Van Hove singularity

et al. 2019

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Recent experiments revealed non-Fermi-liquid resistivity in the unconventional superconductor Sr 2 RuO 4 when strain pushes one of the Fermi surfaces close to a van Hove singularity. The origin of this behavior and whether it can be understood from a picture of well defined quasiparticles is unclear. We employ a Boltzmann transport analysis beyond the single relaxation-time approximation based on a single band which undergoes a Lifshitz transition, where the Fermi surface crosses a van Hove singularity, either due to uni-axial or epitaxial strain. First analytically investigating impurity scattering, we clarify the role of the diverging density of states together with the locally flat band at the point of the Lifshitz transition. Additionally including electron-electron scattering numerically, we find good qualitative agreement with resistivity measurements on uni-axially strained Sr 2 RuO 4 , including the temperature scaling and the temperature dependence of the resistivity peak. Our results imply that even close to the Lifshitz transition, a description starting from well-defined quasiparticles holds. To test the validity of Boltzmann transport theory near a van Hove singularity, we provide further experimentally accessible parameters, such as thermal transport, the Seebeck coefficient, and Hall resistivity and compare different strain scenarios.

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Section: Appendix A: Model For the γ Band Of Sr 2 Ruomentioning

confidence: 99%

Deviation from Fermi-liquid transport behavior in the vicinity of a Van Hove singularity

et al. 2019

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“…Uniaxial pressure is therefore particularly well suited to tuning to the class of Lifshitz transition involving a topological change from a closed to an open Fermi surface by traversing the VHS associated with saddle points along one direction of k space. It was used a long time ago in experiments tensioning single crystal whiskers of the three-dimensional superconductors aluminium [20] and cadmium [21] but traversing the transition had only a weak effect; T c , for example, changed by only ∼20 mK. Recently, we have developed novel methods of applying high levels of uniaxial pressure to single crystals that are not restricted to whiskers and are well suited to studying the more interesting case of materials with quasi-2D electronic structure [22,23].…”

mentioning

confidence: 99%

Resistivity in the Vicinity of a van Hove Singularity: Sr2RuO4 under Uniaxial Pressure

Barber¹,

Gibbs²,

Maeno³

et al. 2018

Phys. Rev. Lett.

105

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We report the results of a combined study of the normal-state resistivity and superconducting transition temperature T_{c} of the unconventional superconductor Sr_{2}RuO_{4} under uniaxial pressure. There is strong evidence that, as well as driving T_{c} through a maximum at ∼3.5 K, compressive strains ϵ of nearly 1% along the crystallographic [100] axis drive the γ Fermi surface sheet through a van Hove singularity, changing the temperature dependence of the resistivity from T^{2} above, and below the transition region to T^{1.5} within it. This occurs in extremely pure single-crystals in which the impurity contribution to the resistivity is <100 nΩ cm, so our study also highlights the potential of uniaxial pressure as a more general probe of this class of physics in clean systems.

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“…They are generally correlated with a van Hove singularity crossing the Fermi level, though this may not be straightforward to ascertain in non-elemental systems with complicated densities of states. Nevertheless, LTs have been deduced, for example, from pressure study of elastic constants in YCo 5 [5], Shubnikov-dHvA effect in Cd [6], and through the superconducting transition temperature (T c ) and magnetothermopower in Al [7]. This can be understood by considering in 3D a change in thermodynamic potential, δΩ ∝ | F − c | 5/2 ≡ |z| 5/2 , where z is the distance from the quantum critical point, c , and Ω the thermodynamic potential.…”

Section: Lifshitz Transitionmentioning

confidence: 99%

Pressure‐Driven Enthalpic and Lifshitz Transition in 122‐Pnictides

Quader

Widom

2015

Contrib. Plasma Phys.

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Iron-arsenic pnictides are a class of compounds in which strong Coulomb interactions manifest in novel properties. We discuss basic ideas behind a Lifshitz transition and review salient properties of 122-pnictides (AFe 2As2; A = Ca, Sr, Ba, Ra). Using T = 0 first principles total energy calculations, as a function of hydrostatic pressure, we show that several pressure-driven anomalies, and the tetragonal (T) to collapsed tetragonal (cT) phase transition in the 122-pnictides family, can be understood as consequences of Lifshitz transitions arising from nontrivial changes in Fermi surface topology. We also show that several features found in our calculations, namely, enthalpic, magnetic and T-cT transitions, are universal to the 122-pnictides.

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Stress-Induced Electronic Transition (2.5 Order) in Al

Cited by 28 publications

References 12 publications

Deviation from Fermi-liquid transport behavior in the vicinity of a Van Hove singularity

Deviation from Fermi-liquid transport behavior in the vicinity of a Van Hove singularity

Resistivity in the Vicinity of a van Hove Singularity: Sr2RuO4 under Uniaxial Pressure

Pressure‐Driven Enthalpic and Lifshitz Transition in 122‐Pnictides

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