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Heat transport over nonmagnetic lithium chains in LiCuVO |
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| Authors: | L. S. Parfen’eva A. I. Shelykh I. A. Smirnov A. V. Prokof’ev W. Assmus H. Misiorek J. Mucha A. Jezowski I. G. Vasil’eva |
| Affiliation: | (1) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(2) Institute of Physics, Goethe University, Frankfurt am Main, 60054, Germany;(3) Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw, 50-950, Poland;(4) Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, pr. Akademika Lavrent’eva 3, Novosibirsk, 630090, Russia |
| Abstract: | The thermal conductivity of three single-crystal samples of the quasi-one-dimensional spin system of LiCuVO4 with different concentrations of defects (primarily, vacancies on the lithium sublattice) was measured along the crystallographic a axis (along the nonmagnetic lithium chains) in the temperature interval 5–300 K. An increase in thermal conductivity from that of the crystal lattice was revealed for T>150–200 K. This increase can be accounted for only by assuming LiCuVO4 to be a superionic conductor. This assumption was confirmed by measuring its electrical conductivity in the temperature interval 300–500 K. Li+ ions move over vacancies on the lithium sublattice (conducting channels) and act as charge carriers in LiCuVO4. It is shown that LiCuVO4 is a fairly good superionic conductor with application potential. |
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