Low-energy fluctuations on approaching the structural quantum critical point in Lu(Pt_(1-x)Pd_x)_2In
Quantum critical points (QCPs) are second order phase transitions that occur at T=0; they involve unusual critical fluctuations, which give rise to interesting phenomena such as unconventional superconductivity and non Fermi-liquid behaviour. So far QCPs have mostly been studied for magnetic phase transitions. Recently, we have discovered that the phase diagram of the substitution series Lu(PtPd)2In shows a QCP of a structural phase transition, from a cubic Heusler to a cubic superstructure phase. We observe superconductivity with the highest transition temperature at the QCP, suggesting a link between the unusual critical fluctuations and the appearance of superconductivity. We have previously measured inelastic neutron scattering at IN4 and IN6, where we observed enhanced fluctuations at the transition temperature in LuPt2In. They appear below 1-2 meV at the superstructure Bragg peak, while other energy and momentum transfers are unaffected by both Pd substitution and temperature. Now we propose to study these unusual fluctuations for other samples of the substitution series, closer to the QCP, using the cold neutron spectrometer IN6.
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HUESGES Zita; GEIBEL Christoph; GRUNER Thomas; KOZA Michael Marek; LUCAS Stefan and STOCKERT Oliver. (2015). Low-energy fluctuations on approaching the structural quantum critical point in Lu(Pt_(1-x)Pd_x)_2In. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-02-162
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