Direct observation of the superconducting gap ofSr2RuO4 | Zendy

M. D. Upward | Zendy; Leo P. Kouwenhoven | Zendy; Alberto F. Morpurgo | Zendy; Naoki Kikugawa | Zendy; Zhiqiang Mao | Zendy; Y. Maeno | Zendy

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Direct observation of the superconducting gap ofSr2RuO4

Author(s) -

M. D. Upward,

Leo P. Kouwenhoven,

Alberto F. Morpurgo,

Naoki Kikugawa,

Zhiqiang Mao,

Y. Maeno

Publication year - 2002

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.65.220512

Subject(s) - superconductivity , condensed matter physics , quantum tunnelling , anisotropy , physics , crystal (programming language) , field (mathematics) , scanning tunneling microscope , spectroscopy , materials science , quantum mechanics , computer science , mathematics , pure mathematics , programming language

We report the direct observation of the superconducting gap of Sr 2 RuO 4 , by means of tunnelling spectroscopy. The tunneling conductance parallel to the c axis was measured using a scanning tunneling microscope operating in a dilution refrigerator. Our results show a suppression in the density of states of Sr 2 RuO 4 , which disappears at temperatures higher than T c or in the presence of a magnetic field larger than the critical field. This demonstrates that superconductivity persists up to the crystal surface and allows us to infer a lower limit of 8.0 for 2Δ m a x /kT c in the bulk. We attribute this large value to a strong in-plane anisotropy of the gap.

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