Session J11: Focus Session: MgB2-like: Novel Non-Boride Superconductors

11:15 AM–2:03 PM, Tuesday, March 11, 2008
Morial Convention Center - RO9

Sponsoring Unit: DMP
Chair: Vladimir Butko, Brookhaven National Laboratory

Abstract ID: BAPS.2008.MAR.J11.5

Abstract: J11.00005 : Unconventional superconductivity in single crystal Lu$_{2}$Fe$_{3}$Si$_{5}$

12:27 PM–12:39 PM

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Authors:

  R. Gordon
    (Ames Laboratory)

  M.D. Vannette
    (Ames Laboratory)

  C. Martin
    (Ames Laboratory)

  T. Tamegai
    (Department of Applied Physics, The University of Tokyo, Japan)

  Y. Nakajima
    (Department of Applied Physics, The University of Tokyo, Japan)

  R. Prozorov
    (Ames Laboratory)

Dynamic magnetic susceptibility for a single crystal of the ternary superconductor Lu$_{2}$Fe$_{3}$Si$_{5}$ has been measured using a tunnel diode resonator (TDR) technique. The London penetration depth exhibits non-exponential temperature dependence. We analyze the obtained superfluid density by comparing models of two-gap superconductivity, a gap with nodes or a highly anisotropic gap. The upper critical field is highly anisotropic and is unusually large. Furthermore, hysteresis in the susceptibility implies unusually strong temperature dependence of the critical current. The results are discussed in terms of possible unconventional behavior of this low-T$_{c}$ superconductor.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.J11.5