Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.17: Poster
Wednesday, March 14, 2018, 15:00–19:00, Poster B
Evolution of the order parameter close to the CDW quantum critical point in Lu(Pt1-xPdx)2In — •Stefan Lucas1, Thomas Gruner1, Andreas Hoser2, Manfred Reehuis2, Karin Schmalzl3, Michael Marek Koza3, Christoph Geibel1, and Oliver Stockert1 — 1Max Planck Institute for Chemichal Physics of Solids, Dresden, Germany — 2Helmholtz-Zentrum Berlin, Germany — 3Institut Laue-Langevin, Grenoble, France
In contrast to magnetic quantum phase transitions being studied for many years, those driven by an instability of the crystal structure are hardly investigated so far. The intermetallic alloying series Lu(Pt1-xPdx)2In represents a model system to study a Charge-Density-Wave (CDW) quantum critical point (QCP) occurring at x ≈ 0.58 [1]. A strong and well defined maximum of the superconducting transition temperature right in the vicinity of the QCP indicates a close connection between the low-energy order parameter fluctuations and superconductivity. The important role of the structural fluctuations is already suggested in specific heat and resistivity measurements and was now investigated by neutron diffraction. We present the evolution of the superstructure (i.e. the order parameter) for different concentrations of Lu(Pt1-xPdx)2In and discuss the role of critical fluctuations in this system.
[1] T. Gruner et al., Nat. Phys. 13, 967 (2017)