Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 6: Postersitzung I (Amorphe- u. Tunnelsysteme, Niedrigdimensionale Systeme, Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter)

TT 6.17: Poster

Montag, 24. März 2003, 14:30–19:00, P2c, P2d

Transport properties of CeBiPt in magnetic fields up to 50 T — •J. Hagel¹, J. Wosnitza¹, N. Kozlova², D. Eckert², K.-H. Müller², G. Goll³, T. Yoshino⁴, and T. Takabatake⁴ — ¹Institut für Angewandte Physik (IAPD), TU Dresden, D-01062 Dresden, Germany — ²IFW Dresden, D-01171 Dresden, Germany — ³Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany — ⁴Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8526, Japan

In the semimetallic compound CeBiPt a strong temperature dependence of the Shubnikov-de Haas (SdH) oscillation frequency is observed [1]. This temperature-dependent Fermi surface might indicate a possible hybridization of the 4f electrons. In the non-magnetic sister compound LaBiPt such an effect in the electronic structure does not occur. By extending the magnetic-field range of the magnetoresistance measurements up to about 50 T in the pulsed-field facility at the High Magnetic Field Laboratory Dresden (HLD) at the IFW Dresden we observe in fields above about 25 T near the quantum limit a drastic change of the electronic band parameters. The SdH oscillations cease and a strong increase of the magnetoresistance is observed. Measurements of the Hall resistance indicate an increase of the charge-carrier density in fields above 25 T.

[1] G. Goll et al., Europhys. Lett. 57, 233 (2002)