Quasi-particle interference of the van Hove singularity in Sr2RuO4

A. Kreisel; C. A. Marques; L. C. Rhodes; X. Kong; T. Berlijn; R. Fittipaldi; V. Granata; A. Vecchione; P. Wahl; P. J. Hirschfeld

doi:10.1038/s41535-021-00401-x

Quasi-particle interference of the van Hove singularity in Sr₂RuO₄

A. Kreisel^*
, C. A. Marques
, L. C. Rhodes
, X. Kong
, T. Berlijn
, R. Fittipaldi
, V. Granata
, A. Vecchione
, P. Wahl^*
, P. J. Hirschfeld

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The single-layered ruthenate Sr₂RuO₄ is one of the most enigmatic unconventional superconductors. While for many years it was thought to be the best candidate for a chiral p-wave superconducting ground state, desirable for topological quantum computations, recent experiments suggest a singlet state, ruling out the original p-wave scenario. The superconductivity as well as the properties of the multi-layered compounds of the ruthenate perovskites are strongly influenced by a van Hove singularity in proximity of the Fermi energy. Tiny structural distortions move the van Hove singularity across the Fermi energy with dramatic consequences for the physical properties. Here, we determine the electronic structure of the van Hove singularity in the surface layer of Sr₂RuO₄ by quasi-particle interference imaging. We trace its dispersion and demonstrate from a model calculation accounting for the full vacuum overlap of the wave functions that its detection is facilitated through the octahedral rotations in the surface layer.

Original language	English
Article number	100
Number of pages	9
Journal	npj Quantum Materials
Volume	6
DOIs	https://doi.org/10.1038/s41535-021-00401-x
Publication status	Published - 9 Dec 2021

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Controlling Emergent Orders in Quantum: Controlling Emergent Orders in Quantum Materials
Wahl, P. (PI), Hooley, C. (CoI) & Lee, S. (CoI)
EPSRC
1/06/18 → 30/06/23
Project: Standard

Imaging emergent correlated phases in the strontium ruthenates (thesis data)
de Almeida Marques, C. (Creator) & Wahl, P. (Supervisor), University of St Andrews, 10 Jan 2024
DOI: 10.17630/99e7a681-d169-42c1-a0ae-c50c9366176a
Dataset: Thesis dataset

File
Quasiparticle Interference of the van-Hove singularity in Sr2RuO4 (dataset)
Kreisel, A. (Creator), De Almeida Marques, C. (Creator), Rhodes, L. C. (Creator), Kong, X. (Creator), Berlijn, T. (Creator), Fittipaldi, R. (Creator), Granata, V. (Creator), Vecchione, A. (Creator), Wahl, P. (Creator) & Hirschfeld, P. (Creator), University of St Andrews, 2021
DOI: 10.17630/58e255a1-4696-488d-b154-693d1f0518b4
Dataset

File

Cite this

@article{2c7759efe522418aa5b22abac271ad42,

title = "Quasi-particle interference of the van Hove singularity in Sr2RuO4",

abstract = "The single-layered ruthenate Sr2RuO4 is one of the most enigmatic unconventional superconductors. While for many years it was thought to be the best candidate for a chiral p-wave superconducting ground state, desirable for topological quantum computations, recent experiments suggest a singlet state, ruling out the original p-wave scenario. The superconductivity as well as the properties of the multi-layered compounds of the ruthenate perovskites are strongly influenced by a van Hove singularity in proximity of the Fermi energy. Tiny structural distortions move the van Hove singularity across the Fermi energy with dramatic consequences for the physical properties. Here, we determine the electronic structure of the van Hove singularity in the surface layer of Sr2RuO4 by quasi-particle interference imaging. We trace its dispersion and demonstrate from a model calculation accounting for the full vacuum overlap of the wave functions that its detection is facilitated through the octahedral rotations in the surface layer.",

author = "A. Kreisel and Marques, \{C. A.\} and Rhodes, \{L. C.\} and X. Kong and T. Berlijn and R. Fittipaldi and V. Granata and A. Vecchione and P. Wahl and Hirschfeld, \{P. J.\}",

note = "Funding: J.H. was supported by the US Department of Energy under Grant no. DE-FG02-05ER46236. C.A.M. and P.W. acknowledge funding from EPSRC through EP/L015110/1 and EP/R031924/1, respectively, and L.C.R. from the Royal Commission for the Exhibition of 1851.",

year = "2021",

month = dec,

day = "9",

doi = "10.1038/s41535-021-00401-x",

language = "English",

volume = "6",

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issn = "2397-4648",

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TY - JOUR

T1 - Quasi-particle interference of the van Hove singularity in Sr2RuO4

AU - Kreisel, A.

AU - Marques, C. A.

AU - Rhodes, L. C.

AU - Kong, X.

AU - Berlijn, T.

AU - Fittipaldi, R.

AU - Granata, V.

AU - Vecchione, A.

AU - Wahl, P.

AU - Hirschfeld, P. J.

N1 - Funding: J.H. was supported by the US Department of Energy under Grant no. DE-FG02-05ER46236. C.A.M. and P.W. acknowledge funding from EPSRC through EP/L015110/1 and EP/R031924/1, respectively, and L.C.R. from the Royal Commission for the Exhibition of 1851.

PY - 2021/12/9

Y1 - 2021/12/9

N2 - The single-layered ruthenate Sr2RuO4 is one of the most enigmatic unconventional superconductors. While for many years it was thought to be the best candidate for a chiral p-wave superconducting ground state, desirable for topological quantum computations, recent experiments suggest a singlet state, ruling out the original p-wave scenario. The superconductivity as well as the properties of the multi-layered compounds of the ruthenate perovskites are strongly influenced by a van Hove singularity in proximity of the Fermi energy. Tiny structural distortions move the van Hove singularity across the Fermi energy with dramatic consequences for the physical properties. Here, we determine the electronic structure of the van Hove singularity in the surface layer of Sr2RuO4 by quasi-particle interference imaging. We trace its dispersion and demonstrate from a model calculation accounting for the full vacuum overlap of the wave functions that its detection is facilitated through the octahedral rotations in the surface layer.

AB - The single-layered ruthenate Sr2RuO4 is one of the most enigmatic unconventional superconductors. While for many years it was thought to be the best candidate for a chiral p-wave superconducting ground state, desirable for topological quantum computations, recent experiments suggest a singlet state, ruling out the original p-wave scenario. The superconductivity as well as the properties of the multi-layered compounds of the ruthenate perovskites are strongly influenced by a van Hove singularity in proximity of the Fermi energy. Tiny structural distortions move the van Hove singularity across the Fermi energy with dramatic consequences for the physical properties. Here, we determine the electronic structure of the van Hove singularity in the surface layer of Sr2RuO4 by quasi-particle interference imaging. We trace its dispersion and demonstrate from a model calculation accounting for the full vacuum overlap of the wave functions that its detection is facilitated through the octahedral rotations in the surface layer.

U2 - 10.1038/s41535-021-00401-x

DO - 10.1038/s41535-021-00401-x

M3 - Article

SN - 2397-4648

VL - 6

JO - npj Quantum Materials

JF - npj Quantum Materials

M1 - 100

ER -

Quasi-particle interference of the van Hove singularity in Sr2RuO4

Abstract

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Projects

Controlling Emergent Orders in Quantum: Controlling Emergent Orders in Quantum Materials

Datasets

Imaging emergent correlated phases in the strontium ruthenates (thesis data)

Quasiparticle Interference of the van-Hove singularity in Sr2RuO4 (dataset)

Cite this

Quasi-particle interference of the van Hove singularity in Sr₂RuO₄