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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.34: Poster

Monday, March 22, 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. Wosnitza11Hochfeld-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.

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