Structural Quantum Critical Point in Lu(PtPd)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. 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 would like to investigate this relation further by measuring the phonon density of states by inelastic neutron scattering. The comparison of different samples of the alloying series would allow to study the development of soft phonons.
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HUESGES Zita; GEIBEL Christoph; GRUNER Thomas; KOZA Michael Marek and STOCKERT Oliver. (2014). Structural Quantum Critical Point in Lu(PtPd)2In. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-02-148
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