The effect of a magnetic field on the thermal conductivity of paramagnetic crystals: holmium ethylsulphate

摘要: The thermal conductivity of crystals concentrated cerium ethylsulphate has been measured in the range 1 to 4.58 $^\circ$K and magnetic fields up 53 kG. In zero field there is a marked anomaly at 2.5 variation with temperature. Owing anisotropy g-values dependence resistivity constant temperature depends on direction; parallel hexagonal axis, maximum occurs which moves roughly linearly temperature, very high it always less than field; applied perpendicular direction only observed above 2 $^\circ$K, highest available much greater field. These results are explained by assuming that direct process phonon-spin interactions scatter certain bands phonons whose frequency separation energy levels produced A statistical theory used determine relative populations calculation resistivity. It assumed spin-phonon absorption lineshape Gaussian. By fitting experimental data, approximate values spin-lattice coupling constant, linewidth transitions mean free paths for boundary point-defect scattering obtained.