Spectroscopic Evidence for Unconventional Superconductivity in UBe{sub 13}

Journal Article · Mon Jun 12 00:00:00 EDT 2000 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.84.5616· OSTI ID:20216810

Waelti, Ch; Ott, H R; Fisk, Z; Smith, J L

We report on measurements of the differential conductivity G of UBe{sub 13}- Au 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<T{sub c} we also establish a lower limit of the normalized energy gap, such that (2{delta}(0)/k{sub B}T{sub c})>6.7 , much in excess of the weak coupling BCS value of 3.5, and directly indicating strong coupling effects in superconducting UBe{sub 13} . (c) 2000 The American Physical Society.

• OSTI ID: 20216810
• Journal Information: Physical Review Letters, Vol. 84, Issue 24; Other Information: PBD: 12 Jun 2000; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
URANIUM ALLOYS
BERYLLIUM ALLOYS
BOUND STATE
SUPERCONDUCTING JUNCTIONS
GOLD
SUPERCONDUCTING FILMS
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA