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2014 | 126 | 1 | 350-351
Article title

Defect Mode in LaB_{6}

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EN
Abstracts
EN
The specific heat of high quality La^{N}B_{6} (N=10, 11, natural) single crystals is investigated in a wide range of temperatures 2 - 300 K. The obtained data allow to estimate correctly (i) the electronic γ· T term of specific heat (γ ≈ 2.4 mJ/(mol·K^{2})), (ii) the contribution from quasilocal vibrating mode of La^{3+} ions (Θ_{E} ≈ 150 - 152 K), (iii) the Debye-type term from rigid boron cages (Θ_{D} ≈ 1160± 40 K). Our data also suggest an additional defect-mode component (iv) which may be attributed to a contribution of 1.5% boron vacancies in LaB_{6}. The obtained results may be interpreted in terms of formation of two level systems, which appear when La^{3+} ions are displaced from their centrosymmetric positions in the cavities of rigid boron cages, apart from randomly distributed boron vacancies in the LaB_{6} matrix.
Keywords
EN
Publisher

Year
Volume
126
Issue
1
Pages
350-351
Physical description
Dates
published
2014-07
Contributors
author
  • A.M. Prokhorov General Physics Institute of RAS, Vavilov str. 38, 119991 Moscow, Russia
author
  • A.M. Prokhorov General Physics Institute of RAS, Vavilov str. 38, 119991 Moscow, Russia
author
  • A.M. Prokhorov General Physics Institute of RAS, Vavilov str. 38, 119991 Moscow, Russia
  • Moscow Institute of Physics and Technology, Institutskii per. 9, 141700 Dolgoprudnyi, Russia
author
  • A.M. Prokhorov General Physics Institute of RAS, Vavilov str. 38, 119991 Moscow, Russia
  • Moscow Institute of Physics and Technology, Institutskii per. 9, 141700 Dolgoprudnyi, Russia
author
  • A.M. Prokhorov General Physics Institute of RAS, Vavilov str. 38, 119991 Moscow, Russia
author
  • P.N. Lebedev Physical Institute of RAS, Leninskii Prospect 53, 119991 Moscow, Russia
author
  • P.N. Lebedev Physical Institute of RAS, Leninskii Prospect 53, 119991 Moscow, Russia
  • I. Frantsevich Institute for Problems of Materials Science NAS, Krzhyzhanovsky str. 3, 03680 Kiev, Ukraine
author
  • I. Frantsevich Institute for Problems of Materials Science NAS, Krzhyzhanovsky str. 3, 03680 Kiev, Ukraine
author
  • I. Frantsevich Institute for Problems of Materials Science NAS, Krzhyzhanovsky str. 3, 03680 Kiev, Ukraine
author
  • Institute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia
author
  • Institute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia
author
  • A.M. Prokhorov General Physics Institute of RAS, Vavilov str. 38, 119991 Moscow, Russia
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv126n1169kz
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