Electron-Phonon Umklapp Interaction in the Low-Temperature Electrical Resistivity of Potassium
- 21 June 1971
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 26 (25) , 1550-1553
- https://doi.org/10.1103/physrevlett.26.1550
Abstract
It has long been postulated that, in those metals where the Fermi surface does not touch the Brillouin zone boundary, the electron-phonon umklapp scattering contribution to the electrical resistivity should rapidly disappear at sufficiently low temperatures. New experimental and theoretical evidence for such an effect is reported in the low-temperature electrical resistivity of potassium; the contribution from umklapp processes prevails over that of normal processes above ∼2.5°K, but decreases rapidly for temperatures below this.Keywords
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