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

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons126742

Mackenzie,  A. P.
Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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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 Sr2RuO4. Physical Review B, 88(13): 134521, pp. 134521-1-134521-9. doi:10.1103/PhysRevB.88.134521.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-1E34-A
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.