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Publications (11)

cond-mat.supr-con2016

Multiband one-dimensional electronic structure and spectroscopic signature of Tomonoga-Luttinger liquid behavior in K $_{2}$ Cr $_{3}$ As $_{3}$

M. D. Watson, Y. Feng, C. W. Nicholson +8

We present Angle-Resolved Photoemission Spectroscopy measurements of the quasi-one dimensional superconductor K $_{2}$ Cr $_{3}$ As $_{3}$ . We find that the Fermi surface contains two Fermi s…

cond-mat.str-el2016

Topological Triplon Modes and Bound States in a Shastry-Sutherland Magnet

P. A. McClarty, F. KrÃ¼ger, T. Guidi +5

The twin discoveries of the quantum Hall effect, in the 1980's, and of topological band insulators, in the 2000's, were landmarks in physics that enriched our view of the electroni…

cond-mat.mtrl-sci2016

A local Fock-exchange potential in Kohn-Sham equations

T. W. Hollins, S. J. Clark, K. Refson +1

We derive and employ a local potential to represent the Fock exchange operator in electronic single-particle equations. This local Fock-exchange (LFX) potential is very similar to…

cond-mat.mtrl-sci2019

Theory of momentum-resolved phonon spectroscopy in the electron microscope

R. J. Nicholls, F. S. Hage, D. G. McCulloch +3

We provide a theoretical framework for the prediction and interpretation of momentum dependent phonon spectra due to coherent inelastic scattering of electrons. We complete the app…

cond-mat.mtrl-sci2013

Room temperature single-crystal diffuse scattering and ab initio lattice dynamics in CaTiSiO5

M. J. Gutmann, K. Refson, M. v. Zimmermann +3

Single-crystal diffuse scattering data have been collected at room temperature on synthetic titanite using both neutrons and high-energy X-rays. A simple ball-and-springs model rep…

cond-mat2003

Spin singlet formation in MgTi $_{2}$ O $_{4}$ : evidence of a helical dimerization pattern

M. Schmidt, W. Ratcliff, P. G. Radaelli +3

The transition metal spinel MgTi $_{2}$ O $_{4}$ undergoes a metal-insulator transition on cooling below $T_{M - I} = 260$ K. A sharp reduction of the magnetic susceptibility below $T_{M-I}…

cond-mat.mtrl-sci2019

Kagome modes, a new route to ultralow thermal conductivity?

D. J. Voneshen, M. Ciomaga Hatnean, T. G. Perring +4

From next generation gas turbines to scavenging waste heat from car exhausts, finding new materials with ultra-low thermal conductivity ( $I^º$ ) has the potential to lead to large ga…

mtrl-th1995

Water Chemisorption and Reconstruction of the MgO Surface

K. Refson, R. A. Wogelius, D. G. Fraser +3

The observed reactivity of MgO with water is in apparent conflict with theoretical calculations which show that molecular dissociation does not occur on a perfect (001) surface. We…

cond-mat.mtrl-sci2025

Low energy phonons in single crystal ZrW $_{2}$ O $_{8}$

R. A. Ewings, A. I. Duff, K. Refson +2

ZrW $_{2}$ O $_{8}$ is the prototypical example of a material exhibiting negative thermal expansion (NTE). It is now widely accepted that in ZrW $_{2}$ O $_{8}$ , and in many other framew…

cond-mat.str-el2019

Role of defects in determining the magnetic ground state of ytterbium titanate

D. F. Bowman, E. Cemal, T. Lehner +11

Pyrochlore systems are ideally suited to the exploration of geometrical frustration in three dimensions, and their rich phenomenology encompasses topological order and fractional e…

cond-mat.supr-con2015

Two-dimensional Cs-vacancy superstructure in iron-based superconductor $C s_{0.8} F e_{1.6} S e_{2}$

D. G. Porter, E. Cemal, D. J. Voneshen +8

Single crystal neutron diffraction is combined with synchrotron x-ray scattering to identify the different superlattice phases present in $C s_{0.8} F e_{1.6} S e_{2}$ . A combination of s…