Events Calendar
Jan 17
14:00 - 15:00
Dr. Malte Grosche (Cavendish Laboratory, University of Cambridge): Correlated States Near Pressure-Induced Instabilities
Physical Sciences colloquia

Many complex materials display an interesting interplay between structural and electronic instabilities, which can be studied effectively under applied pressure. If a continuous structural phase transition is suppressed to low temperatures, as in the quasi-skutterudite system (Sr/Ca)3(Ir/Rh)4Sn13 [1], low-energy vibrational excitations can arise that boost superconductivity and cause a linearly temperature dependent electrical resistivity. We report that the aperiodic high-pressure host-guest structure of elemental bismuth displays a similar phenomenology, suggesting significantly enhanced phonon spectral weight at low energies.

It is increasingly desirable to probe the electronic structure near pressure-induced quantum phase transitions directly and in detail. We have observed the electronic Fermi surface on the metallic side of a Mott insulating transition by high pressure quantum oscillation measurements in NiS2 [2]. Our results show that the Fermi surface remains large on approaching the Mott insulating state, consistent with Luttinger's theorem, whereas the quasiparticle effective mass is strongly renormalised.

References

1. Goh et al. Phys. Rev. Lett. 114, 097002 (2015) 2. Friedemann et al. Sci. Rep. 6, 416 (2016)

Location

Ingram Lecture Theatre
United Kingdom
Canterbury map

Details

Open to all,

Contact: Helena Shepherd
E: h.j.shepherd@kent.ac.uk
School of Physical Sciences

 

Corporate Communications - © University of Kent

The University of Kent, Canterbury, Kent, CT2 7NZ, T: +44 1227 764000

Last Updated: 10/01/2012