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TT: Fachverband Tiefe Temperaturen

TT 60: Correlated Electrons: f-Electron Systems

TT 60.1: Vortrag

Donnerstag, 23. März 2017, 09:30–09:45, HSZ 201

Fermi-surface evolution in the Nd_xCe_1−xCoIn₅ doping series — •J. Klotz^1,2, E. Green¹, K. Götze¹, C. Petrovic³, I. Sheikhin⁴, J.-H. Park⁵, and J. Wosnitza^1,2 — ¹Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, Germany — ²Institut für Festkörperphysik, TU Dresden, Germany — ³Brookhaven National Laboratory, Brookhaven, USA — ⁴Laboratoire National des Champs Magnétiques Intenses, Grenoble, France — ⁵National High Magnetic Field Laboratory, Tallahassee, USA

CeCoIn₅ is one of the prime examples for heavy-fermion (HF) superconductivity [1]. However, superconductivity vanishes upon Nd doping on the Ce site [2]. Since there are several theory studies suggesting a relation of the Fermi-surface (FS) geometry and superconductivity, e. g. [3], the knowledge of the Fermi surface is of vital importance. Here, we present quantum-oscillation data of Nd_xCe_1−xCoIn₅ obtained using a rotatable torque magnetometer in fields up to 35 T and temperatures down to 50 mK. In combination with band-structure calculations, our data reveal only a subtle change in the cylindrical FS sheet of CeCoIn₅, but a strong change in the effective-mass renormalization.

[1] C. Petrovic, P. G. Pagliuso et al. J. Phys.: Condens. Matter 13, L337 (2001).

[2] R. Hu, Y. Lee et al. Phys. Rev. B 77, 165129 (2008).

[3] T. Moriya, Y. Takahashi, and K. Ueda, J. Phys. Soc. Jpn. 59, 2905 (1990).