Low temperature thermal magnetoconductance of metals

A low temperature transverse thermal magnetoconductance of metals and semimetals is treated theoretically. It is shown that its high magnetic field behavior is determined by the characteristic time $\tau_\varepsilon$ of jumps from one cyclotron circle to another due to electron-phonon collisions rather than by the transport time $\tau_{\mathrm{tr}}$ that determines the conductance. The phonon-electron drag contribution to the magnetoconductance is also discussed.