Spectroscopic Evidence for Unconventional Superconductivity in UBe13

Ch. Wälti, H. R. Ott, Z. Fisk, and J. L. Smith
Phys. Rev. Lett. 84, 5616 – Published 12 June 2000
PDFExport Citation

Abstract

We report on measurements of the differential conductivity G of UBe13Au contacts, which reveal the existence of low-energy Andreev surface bound states. These bound states are identified via huge conductance peaks at zero bias that may form only in superconductors with nontrivial energy-gap functions. From the voltage dependence of G at T<Tc we also establish a lower limit of the normalized energy gap, such that 2Δ(0)kBTc>6.7, much in excess of the weak coupling BCS value of 3.5, and directly indicating strong coupling effects in superconducting UBe13.

  • Received 30 November 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.5616

©2000 American Physical Society

Authors & Affiliations

Ch. Wälti and H. R. Ott

  • Laboratorium für Festkörperphysik, ETH-Hönggerberg, 8093 Zürich, Switzerland

Z. Fisk

  • National High Magnetic Field Laboratory, Tallahassee, Florida 32306-4005

J. L. Smith

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545

References (Subscription Required)

Click to Expand
Issue

Vol. 84, Iss. 24 — 12 June 2000

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×