Solid state Pomeranchuk effect

The Pomeranchuk effect*

A central part of the story of the discovery of superfluid 3He is the cooling technique used for the experiments, the Pomeranchuk effect. Although it is not an especially useful technique for obtaining low temperatures today, it contains my favorite example of the use of the Clausius-Clapeyron equation. The cooling technique is fun to describe in undergraduate physics classes on thermodynamics....

Solid State Solvation Effect

Emission and absorption spectra of many organic dyes in liquid solutions depend on the local electric fields generated by the surrounding polar solvent molecules. This “solvation effect” is a result of intermolecular solutesolvent interaction forces (such as dipole-dipole or dipole-induced dipole) that tend to stretch molecular bonds and shift charge distribution on molecules, altering the ener...

OBSERVATION OF STRONGLY POLARIZED LIQUID AND SOLID 3He USING THE CASTAING-NOZIERES EFFECT AND POMERANCHUK COOLING

The Landau-pomeranchuk-migdal Effect in Qed

The calculation of the radiative energy loss encountered by a fast charged particle which undergoes multiple scattering is being investigated. A detailed derivation of the Landau-PomeranchukMigdal coherent effect in QED is given, focusing on the specific feature of the Coulomb interaction. As a result the radiation intensity per unit length in the coherent regime is shown to be proportional to ...

Effect of disorder on a Pomeranchuk instability

We study the effect of weak and dilute disorder on the order parameter equation and transition temperature of a Pomeranchuk-type Fermi-surface instability using replica mean field theory. We consider the example of a phase transition to a dx2−y2 type Fermi surface distortion, and show that, in the regime where such a transition is second order, the transition temperature is reduced by disorder ...