Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.34: Poster

Montag, 22. März 2010, 14:00–18:00, Poster A

De Haas-van Alphen (dHvA) study of the isostructural compounds YbCoIn₅ and LuCoIn₅ — •A. Polyakov¹, O. Ignatchik¹, M. Bartkowiak¹, A. Bianchi², B. Prevost², G. Seyfarth², Z. Fisk³, D. Hurt³, R.G. Goodrich⁴, E.S. Choi⁵, and J. Wosnitza¹ — ¹Hochfeld-Magnetlabor Dresden (HLD), FZ Dresden-Rossendorf, Dresden, Germany — ²Department of Physics, University of Montreal, Canada — ³Department of Physics and Astronomy, University of California, Irvine (CA), USA — ⁴Department of Physics, George Washington University, Washington (DC), USA — ⁵National High Magnetic Field Laboratory, Tallahassee (FL), USA

The intermetallic compounds RIn₃ and RTIn₅ (R= rare earth, T= transition metal) have attracted great interest for their large variety of anomalous ground states. Among these are the well-known heavy-fermion superconductors CeCoIn₅ and CeIrIn₅. We present here a dHvA study of YbCoIn₅ and LuCoIn₅, performed by use of a capacitive torque cantilever technique at temperatures down to 0.4 K in magnetic fields up to 13 T. In addition, one single crystal of LuCoIn₅ has been measured in magnetic field up to 34 T. Besides their angular-dependent Fermi-surface topologies, we have also determined the effective masses of the different bands by following the temperature-dependent amplitude changes of the dHvA oscillations. A large number of different dHvA frequencies has been observed for the main crystallographic directions. In contrast to CeCoIn₅ and CeIrIn₅, the cyclotron effective masses for these compounds are in the range from 0.7 to 2.0 m₀.

Work supported in part by EuroMagNET, EU contract No. 228043.