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Evidence from tunneling spectroscopy for a quasi-one-dimensional origin of superconductivity in Sr2RuO4

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firmo2013physrevb134521.pdf (897.8Kb)
Date
28/10/2013
Author
Firmo, I. A.
Lederer, S.
Lupien, C.
Mackenzie, A. P.
Davis, J. C.
Kivelson, S. A.
Keywords
Spin-triplet superconductivity
Particle interference
Magnetic-fields
Fermi-surface
Gap structure
Conductivity
Fluctuation
Dependence
Scattering
Symmetry
QC Physics
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Abstract
To establish the mechanism of unconventional superconductivity in Sr2RuO4, a prerequisite is direct information concerning the momentum-space structure of the energy gaps Delta(i) (k), and in particular whether the pairing strength is stronger ("dominant") on the quasi-one-dimensional (alpha and beta) or on the quasi-two-dimensional (gamma) Fermi surfaces. We present scanning tunneling microscopy measurements of the density of states spectra in the superconducting state of Sr2RuO4 for 0.1T(c) < T < T-c and analyze them along with published thermodynamic data using a simple phenomenological model. We show that our observation of a single superconducting gap scale with maximum value 2 Delta approximate to 5T(c) along with a spectral shape indicative of line nodes is consistent, within a weak-coupling model, with magnetically mediated odd-parity superconductivity generated by dominant, near-nodal, Cooper pairing on the alpha and beta bands.
Citation
Firmo , I A , Lederer , S , Lupien , C , Mackenzie , A P , Davis , J C & Kivelson , S A 2013 , ' Evidence from tunneling spectroscopy for a quasi-one-dimensional origin of superconductivity in Sr 2 RuO 4 ' , Physical Review. B, Condensed matter and materials physics , vol. 88 , no. 13 , 134521 . https://doi.org/10.1103/PhysRevB.88.134521
Publication
Physical Review. B, Condensed matter and materials physics
Status
Peer reviewed
DOI
https://doi.org/10.1103/PhysRevB.88.134521
ISSN
1098-0121
Type
Journal article
Description
Funding: UK EPSRC and Royal Society-Wolfson Research Merit Award.
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/4840

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