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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.27: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

Fermi-surface change in Yb-doped CeCoIn₅ — •A. Polyakov¹, O. Ignatchik¹, B. Bergk¹, A.D. Bianchi², S. Blackburn², B. Prevost², M. Cote², G. Seyfarth³, D. Hurt³, Z. Fisk³, R.G. Goodrich⁴, M. Richter⁵, I. Sheikin⁶, and J. Wosnitza¹ — ¹Hochfeld-Magnetlabor Dresden (HLD), Helmholtz-Zentrum Dresden-Rossendorf, Germany — ²Department of Physics, University of Montreal, Canada — ³Department of Physics and Astronomy, University of California Irvine, USA — ⁴Department of Physics, George Washington University, USA — ⁵IFW Dresden, Leibniz Institute for Solid State and Materials Research, Germany — ⁶LNCMI-Grenoble, France

The evolution of the band-structure parameters of Ce_1−xYb_xCoIn₅ was studied as a function of Yb doping by systematic de Haas–van Alphen (dHvA) measurements. We found only a small change of the dHvA frequencies and effective masses of CeCoIn₅ for a low Yb concentrations (x= 0.1). A drastic change of the Fermi surface appears for high dilution, i.e., for x ≥  0.55. The experimentally observed Fermi-surface topology of YbCoIn₅ is in perfect agreement with the calculated band structure. For small x, the effective masses remain strongly renormalized, whereas for x ≥  0.55 the masses are reduced dramatically.

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