Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 39: Correlated Electrons: Heavy Fermions 1
TT 39.12: Vortrag
Donnerstag, 26. März 2009, 12:45–13:00, HSZ 304
The magnetisation dynamics in the superconducting state of UBe13 investigated by inelastic neutron scattering — •Arno Hiess1, Oliver Stockert2, and Zachary Fisk3 — 1Institut Laue - Langevin, Grenoble, France — 2MPI-CPfS, Dresden, Germany — 3Univ. California, Irvine, USA
Inelastic neutron scattering experiments continue to shed light on the interplay of magnetism and superconductivity. Previously such experiments established that the magnetisation dynamics of several high-temperature superconductors differs in the superconducting and in the normal state. Such an effect has also been reported in three intermetallic superconductors, e.g., UPd2Al3, CeCoIn5 and CeCu2Si2. We here report high-resolution inelastic neutron scattering experiments on a large UBe13 single crystal using the cold neutron three-axis spectrometer IN14 at ILL, Grenoble. UBe13 is a cubic material which at low temperatures exhibits a large electronic contribution to the specific heat and becomes superconducting below Tsc = 0.85 K. In agreement with previous experiments and below about 30 K we observed short-lived and short-ranged magnetic fluctuations at selected momentum space positions. The measurements in the normal state show a quasi-elastic signal. Upon entering the superconducting state a reduction of magnetic intensity is observed below 0.5 meV, suggesting the magnetic response becomes inelastic below Tsc. Our results will be compared to those obtained in other superconductors and rationalised within a simple scenario of superconductivity.