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- Title
Boron <sup>10</sup>B—<sup>11</sup>B Isotope Substitution as a Probe of the Mechanism Responsible for the Record Thermionic Emission in LaB<sub>6</sub> with the Jahn—Teller Instability<sup>1</sup>.
- Authors
Zhukova, E. S.; Gorshunov, B. P.; Dressel, M.; Komandin, G. A.; Belyanchikov, M. A.; Bedran, Z. V.; Muratov, A. V.; Aleshchenko, Y. A.; Anisimov, M. A.; Shitsevalova, N. Yu.; Dukhnenko, A. V.; Filipov, V. B.; Voronov, V. V.; Sluchanko, N. E.
- Abstract
We have tested the conduction band electrons of lanthanum hexaboride that is among the most effective electron-beam sources with one of the highest brightness of thermionic emission. We performed infrared spectroscopic, DC (direct current) resistivity and Hall-effect studies of LaB6 single crystals with various 10B and 11B isotope contents. We find that only a small amount of conduction electrons behave as Drude-type charge carriers while about 70% of the electrons are involved in collective oscillations of electron density coupled to vibrations of both the Jahn-Teller unstable rigid boron cage and rattling modes of La-ions loosely bound to the lattice. We suggest that exactly these non-equilibrium conduction electrons determine the extraordinary low work function of thermoemission in LaB6.
- Subjects
THERMIONIC emission; BORON isotopes; CONDUCTION electrons; ELECTRON work function; CHARGE carriers; CONDUCTION bands; HALL effect
- Publication
JETP Letters, 2019, Vol 110, Issue 13, p79
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364019130058