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We investigate the applicability of Migdal–Eliashberg (ME) theory by revisiting Migdal’s analysis within the dynamical mean-field theory framework. First, we compute spectral functions, the quasi-particle weight, the self energy, renormalised phonon frequency and resistivity curves of the...
Results of x-ray diffraction measurements are presented for ZnCr2O4 and Ni0.5Zn0.5Cr2O4. Splits of the x-ray diffraction spectrum are observed in ZnCr2O4 at 12 K. In Ni0.5Zn0.5Cr2O4 no clear split is observed, but a full width at half maximum (FWHM) shows a steep increase below about 20 K. It is...
The quantization of mesoscopic damped circuit involving capacitance-inductance coupling is proposed by the method of thrice linear transformation and damped harmonic oscillator quantization. The quantum fluctuations of the charges and current of each loop are calculated by thermo-field dynamics...
The semiclassical Euclidean path integral method is applied to compute the low temperature quantum decay rate for a particle placed in the metastable minimum of a cubic potential in a finite time theory. The classical path, which makes a saddle for the action, is derived in terms of Jacobian...
We have measured the temperature and magnetic-field dependences of the sound velocity for one longitudinal and two transverse waves in the low field phase (LFP) and the high field phase (HFP) of nuclear spin ordered bcc solid 3He crystals with a single magnetic domain along the melting curve....
We report high resolution measurements of lattice excitations of bcc solid 4He using inelastic neutron scattering. The resulting dispersion relations of the phonons agree well with Path Integral Monte Carlo Simulations which we carried out in parallel with the experimental work. In addition, we...
The insulating and metallic behavior of the grain-boundary weak links has been studied in thallium rich and the samples with small amount of thallium in the charge reservoir layer of Cu1−x
superconductor thin films. The influence of the nature of grain boundaries on the...
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