Defect Mode in LaB_{6}

• Authors: M. Anisimov , A. Bogach , V. Glushkov , S. Demishev , N. Samarin , S. Gavrilkin , K. Mitsen , N. Shitsevalova , A. Levchenko , V. Filippov , S. Gabani , K. Flachbart , N. Sluchanko
• Languages of publication: 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

65.40.Ba

Discipline

• 65.40.Ba: Heat capacity(for specific heat of magnetic materials, see 75.40.-s)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 350-351

Dates

published

2014-07

Contributors

author

M. Anisimov

• A.M. Prokhorov General Physics Institute of RAS, Vavilov str. 38, 119991 Moscow, Russia

author

A. Bogach

• A.M. Prokhorov General Physics Institute of RAS, Vavilov str. 38, 119991 Moscow, Russia

author

V. Glushkov

• 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

S. Demishev

• 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

N. Samarin

• A.M. Prokhorov General Physics Institute of RAS, Vavilov str. 38, 119991 Moscow, Russia

author

S. Gavrilkin

• P.N. Lebedev Physical Institute of RAS, Leninskii Prospect 53, 119991 Moscow, Russia

author

K. Mitsen

• P.N. Lebedev Physical Institute of RAS, Leninskii Prospect 53, 119991 Moscow, Russia

author

N. Shitsevalova

• I. Frantsevich Institute for Problems of Materials Science NAS, Krzhyzhanovsky str. 3, 03680 Kiev, Ukraine

author

A. Levchenko

• I. Frantsevich Institute for Problems of Materials Science NAS, Krzhyzhanovsky str. 3, 03680 Kiev, Ukraine

author

V. Filippov

• I. Frantsevich Institute for Problems of Materials Science NAS, Krzhyzhanovsky str. 3, 03680 Kiev, Ukraine

author

S. Gabani

• Institute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia

author

K. Flachbart

• Institute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia

author

N. Sluchanko

• A.M. Prokhorov General Physics Institute of RAS, Vavilov str. 38, 119991 Moscow, Russia

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Identifiers

DOI

10.12693/APhysPolA.126.350