Neutron resonance spin-echo spectroscopy was used to monitor the temperature evolution of the linewidths of transverse acoustic phonons in lead across the superconducting transition temperature over an extended range of the Brillouin zone. For phonons with energies below the superconducting energy gap, a linewidth reduction of maximum amplitude was observed below . The electron-phonon contribut...

This paper considers a periodic circular cylinder array with additional cylinders and formulates the electromagnetic scattering problem of this imperfectly periodic structure. Generally, the fields in imperfectly periodic structures have continuous spectra, and the spectral-domain approaches require appropriate discretization schemes in many cases. The present formulation is based on the pseudo...

We present the results of our numerical exploration of the fractal structure found by S.P. Novikov in the problem of the behaviour of magnetoresistance in a normal metal under a strong magnetic field. The case we discuss in this paper is the simplest non-trivial one, namely the case of 2 Fermi Surfaces that cut the brillouin zone along of the coordinate axes (i.e. Fermi surfaces have genus 3).

2014 An inelastic neutron scattering study of the ferroelastic phase transition in lead phosphate has revealed in the high temperature phase the existence of a zone boundary soft mode whose character is compatible with the structure change at the transition. The analysis of the observed spectral line shape shows that this soft mode is overdamped between Tc and Tc + 100 K. The quasiharmonic freq...

We calculate the spin susceptibility at and below Tc for a dx2−y2–wave superconductor with resonant impurity scattering and Coulomb correlations. Both the impurity scattering and the Coulomb correlations act to maintain peaks in the spin susceptibility, as a function of momentum, at the Brillouin zone edge. These peaks would otherwise be suppressed by the superconducting gap. The predicted amou...

Two conduction bands with very different effective masses are usually at the X point in half-Heusler Brillouin zone. Our orbital phase diagram provides feasible strategies to converge these two for thermoelectric enhancement.

We use high resolution angle resolved photoemission spectroscopy and density functional theory with measured crystal structure parameters to study the electronic properties of CaKFe_{4}As_{4}. In contrast to the related CaFe_{2}As_{2} compounds, CaKFe_{4}As_{4} has a high T_{c} of 35 K at stochiometric composition. This presents a unique opportunity to study the properties of high temperature s...