Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Tiefe Temperaturen
TT 16: Postersitzung II: Amorphe und Tunnelsysteme, Mesoskopische Systeme, Schwere Fermionen, Kernmagnetismus
TT 16.43: Poster
Dienstag, 27. März 2001, 14:30–17:00, Rang S\ 3
Unconventional heavy-fermion superconductivity probed by uniaxial stress — •C. F. Miclea, M. Grosche, B. Wand, G. R. Stewart, G. Sparn, and F. Steglich — MPI-CPfS, Nöthnitzer Str. 40, 01187 Dresden
In order to examine the nature of the superconducting order parameter in correlated electron systems, we reduce the lattice symmetry by applying uniaxial stress along one of the crystalline axes and investigate the superconducting transition with an ac specific heat method. A compound of particular interest is UBe13, in which superconductivity develops before the onset of a coherent Fermi liquid state. UBe13 belongs to a small class of heavy electron materials that are distinguished by an enormous electronic specific heat coefficient γ ∼ 1 J/molK2 and is one of the few compounds within this class that exhibits superconductivity. A splitting of the superconducting transition temperature Tc of the order of Δ Tc ∼ 50 mK/kbar was predicted by theory in the case of some multicomponent order parameter scenarios. In our preliminary studies, within experimental error (Δ T ∼ 5mK ), no splitting was observed for pressure applied along the (110) and (001) direction. We discuss the implication of this result for our understanding of superconductivity in UBe13 and present an outlook on future studies.