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Infinite charge mobility in muscovite at 300K


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Author: Russell, F. Michael
Archilla, Juan F. R.
Frutos Rayego, Fabián
Medina Carrasco, Santiago
Department: Universidad de Sevilla. Departamento de Física Aplicada I
Date: 2017
Published in: EPL, 120 (4), 46001-1-46001-6.
Document type: Article
Abstract: Evidence is presented for infinite charge mobility in natural crystals of muscovite mica at room temperature. Muscovite has a basic layered structure containing a flat monatomic sheet of potassium sandwiched between mirror silicate layers. It is an excellent electrical insulator. Studies of defects in muscovite crystals indicated that positive charge could propagate over great distances along atomic chains in the potassium sheets in the absence of an applied electric potential. The charge moved in association with anharmonic lattice excitations that moved at about sonic speed and created by nuclear recoil of the radioactive isotope 40K. This was verified by measuring currents passing through crystals when irradiated with energetic alpha particles at room temperature. The charge propagated more than 1000 times the range of the alpha particles of average energy and 250 times the range of channelling particles of maximum energy. The range is limited only by size of the crystal.
Cite: Russell, F.M., Archilla, Juan F. R., Frutos Rayego, F. y Medina Carrasco, S. (2017). Infinite charge mobility in muscovite at 300K. EPL, 120 (4), 46001-1-46001-6.
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DOI: 10.1209/0295-5075/120/46001

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