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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 35: Correlated Electrons: Quantum-Critical Phenomena - Experiment I

TT 35.13: Talk

Tuesday, April 1, 2014, 12:45–13:00, HSZ 204

Fermi liquid breakdown and superconductivity in YFe2Ge2Yang Zou1, Zhuo Feng1,2, •Peter Logg1, Jiasheng Chen1, Giulio Lampronti3, and F. Malte Grosche11Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE — 2Dept. of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ — 3London Centre of Nanotechnology, University College London WC1H 0AH

The investigation of quantum critical phenomena associated with incipient antiferromagnetic or spin density wave order in transition metal compounds has been held back by the scarcity of candidate systems in this class of materials. The paramagnetic d-electron system YFe2Ge2 displays an unusually high Sommerfeld ratio of the specific heat capacity C/T ≃ 100 mJ/molK2 at low temperature and can be tuned to the border of spin density wave order by partial substitution of Y with isoelectronic Lu [1], suggesting that YFe2Ge2 is located close to a spin density wave quantum critical point. Our ambient pressure, low temperature measurements reveal signatures of Fermi liquid breakdown such as an increasing C/T on cooling and a 3/2 power law temperature dependence of the electrical resistivity. Moreover, samples of YFe2Ge2 with high residual resistance ratios display full superconducting transitions below Tc ≃ 1.8 K in the electrical resistivity and up to 80% Meissner volume fraction in bulk zero-field-cooled magnetisation measurements, or 20% in powdered samples [2].
S. Ran et al., Phil. Mag. 91, 4388 (2011).
Y. Zou et al., arXiv:1311.0247 (2013).

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