The single-layered ruthenate Sr 2 RuO 4 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 Sr 2 RuO 4 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.
Kreisel, A., et al. "Quasi-particle interference of the van Hove singularity in Sr2RuO4." npj Quantum Materials, vol. 6, no. 1, Dec. 2021. https://doi.org/10.1038/s41535-021-00401-x
Kreisel, A., Marques, C. A., Rhodes, L. C., Kong, X., Berlijn, T., Fittipaldi, R., Granata, V., Vecchione, A., Wahl, P., & Hirschfeld, P. J. (2021). Quasi-particle interference of the van Hove singularity in Sr2RuO4. npj Quantum Materials, 6(1). https://doi.org/10.1038/s41535-021-00401-x
Kreisel, A., Marques, C. A., Rhodes, L. C., et al., "Quasi-particle interference of the van Hove singularity in Sr2RuO4," npj Quantum Materials 6, no. 1 (2021), https://doi.org/10.1038/s41535-021-00401-x
@article{osti_1834955,
author = {Kreisel, A. and Marques, C. A. and Rhodes, L. C. and Kong, X. and Berlijn, T. and Fittipaldi, R. and Granata, V. and Vecchione, A. and Wahl, P. and Hirschfeld, P. J.},
title = {Quasi-particle interference of the van Hove singularity in Sr2RuO4},
annote = {Abstract The single-layered ruthenate Sr 2 RuO 4 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 Sr 2 RuO 4 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. },
doi = {10.1038/s41535-021-00401-x},
url = {https://www.osti.gov/biblio/1834955},
journal = {npj Quantum Materials},
issn = {ISSN 2397-4648},
number = {1},
volume = {6},
place = {United Kingdom},
publisher = {Nature Publishing Group},
year = {2021},
month = {12}}
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Florida, Gainesville, FL (United States); University of Florida, Gainesville, FL (United States)
Sponsoring Organization:
Engineering and Physical Sciences Research Council (EPSRC); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; FG02-05ER46236
OSTI ID:
1834955
Alternate ID(s):
OSTI ID: 1864460 OSTI ID: 2497244 OSTI ID: 1992515