Effects of disorder and isotopic substitution in the specific heat and Raman scattering in LuB{sub 12}

doi:https://doi.org/10.1134/S1063776111080103

Title: Effects of disorder and isotopic substitution in the specific heat and Raman scattering in LuB{sub 12}

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Abstract

Precision measurements of the specific heat and spectral intensity I({omega}) of Raman scattering for Lu{sup N}B{sub 12} single crystal samples with various boron isotopes (N = 10, 11, nat) have been performed at low and intermediate temperatures. A boson peak in the low-frequency part of the I({omega}) spectrum has been observed for the first time for lutetium dodecaboride at liquid nitrogen temperatures. It has been shown that low-temperature anomalies in the specific heat, along with the features of Raman spectra, can be interpreted in terms of the transition to a cageglass state at T* = 50-70 K, which appears when Lu{sup 3+} ions are displaced from the centrosymmetric position in cavities of a rigid covalent boron sublattice towards the randomly located boron vacancies. The concentrations of various two-level systems that correspond to two types of vibrational clusters with correlation lengths of 12-15 and 18-22 A, respectively, have been estimated. The vibrational density of states of LuB{sub 12} has been calculated from Raman spectra in the model of soft atomic potentials. An approach has been proposed to explain the dielectrization of the properties of the YbB{sub 12} compound at T < T*, as well as the features of the formation ofmore »« less

Authors:

Azarevich, A N; Bogach, A V; Vlasov, I I; Glushkov, V V; Demishev, S V ^[1]; Maksimov, A A; Tartakovskii, I I; Filatov, E V ^[2]; Flachbart, K; Gabani, S ^[3]; Filippov, V B; Shitsevalova, N Yu ^[4]; Moshchalkov, V V ^[5]

Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)
Russian Academy of Sciences, Institute of Solid State Physics (Russian Federation)
Slovak Academy of Sciences, Institute of Experimental Physics (Slovakia)
National Academy of Sciences of Ukraine, Institute of Problems of Materials Science (Ukraine)
Katholieke Universiteit Leuven, Institute of Nanoscale Physics and Chemistry (Belgium)

Publication Date:: 2011-09-15

OSTI Identifier:: 22028020

Resource Type:: Journal Article

Journal Name:: Journal of Experimental and Theoretical Physics

Additional Journal Information:: Journal Volume: 113; Journal Issue: 3; Other Information: Copyright (c) 2011 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETIC MATERIALS; ANTIFERROMAGNETISM; BORON; BORON ISOTOPES; CORRELATIONS; COVALENCE; ISOTOPIC EXCHANGE; LUTETIUM; LUTETIUM BORIDES; LUTETIUM IONS; MONOCRYSTALS; RAMAN SPECTRA; SPECIFIC HEAT; SUPERCONDUCTIVITY; VACANCIES

Citation Formats


                    Sluchanko, N. E., E-mail: nes@lt.gpi.ru, Azarevich, A N, Bogach, A V, Vlasov, I I, Glushkov, V V, Demishev, S V, Maksimov, A A, Tartakovskii, I I, Filatov, E V, Flachbart, K, Gabani, S, Filippov, V B, Shitsevalova, N Yu, and Moshchalkov, V V. Effects of disorder and isotopic substitution in the specific heat and Raman scattering in LuB{sub 12}.  United States: N. p., 2011. 
        Web.  doi:10.1134/S1063776111080103.

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                    Sluchanko, N. E., E-mail: nes@lt.gpi.ru, Azarevich, A N, Bogach, A V, Vlasov, I I, Glushkov, V V, Demishev, S V, Maksimov, A A, Tartakovskii, I I, Filatov, E V, Flachbart, K, Gabani, S, Filippov, V B, Shitsevalova, N Yu, & Moshchalkov, V V. Effects of disorder and isotopic substitution in the specific heat and Raman scattering in LuB{sub 12}.  United States.  https://doi.org/10.1134/S1063776111080103

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                    Sluchanko, N. E., E-mail: nes@lt.gpi.ru, Azarevich, A N, Bogach, A V, Vlasov, I I, Glushkov, V V, Demishev, S V, Maksimov, A A, Tartakovskii, I I, Filatov, E V, Flachbart, K, Gabani, S, Filippov, V B, Shitsevalova, N Yu, and Moshchalkov, V V. Thu .  
        "Effects of disorder and isotopic substitution in the specific heat and Raman scattering in LuB{sub 12}".  United States.  https://doi.org/10.1134/S1063776111080103.

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@article{osti_22028020,

  title        = {Effects of disorder and isotopic substitution in the specific heat and Raman scattering in LuB{sub 12}},

  author       = {Sluchanko, N. E., E-mail: nes@lt.gpi.ru and Azarevich, A N and Bogach, A V and Vlasov, I I and Glushkov, V V and Demishev, S V and Maksimov, A A and Tartakovskii, I I and Filatov, E V and Flachbart, K and Gabani, S and Filippov, V B and Shitsevalova, N Yu and Moshchalkov, V V},

  abstractNote = {Precision measurements of the specific heat and spectral intensity I({omega}) of Raman scattering for Lu{sup N}B{sub 12} single crystal samples with various boron isotopes (N = 10, 11, nat) have been performed at low and intermediate temperatures. A boson peak in the low-frequency part of the I({omega}) spectrum has been observed for the first time for lutetium dodecaboride at liquid nitrogen temperatures. It has been shown that low-temperature anomalies in the specific heat, along with the features of Raman spectra, can be interpreted in terms of the transition to a cageglass state at T* = 50-70 K, which appears when Lu{sup 3+} ions are displaced from the centrosymmetric position in cavities of a rigid covalent boron sublattice towards the randomly located boron vacancies. The concentrations of various two-level systems that correspond to two types of vibrational clusters with correlation lengths of 12-15 and 18-22 A, respectively, have been estimated. The vibrational density of states of LuB{sub 12} has been calculated from Raman spectra in the model of soft atomic potentials. An approach has been proposed to explain the dielectrization of the properties of the YbB{sub 12} compound at T < T*, as well as the features of the formation of magnetic structures in RB{sub 12} antiferromagnets (R = Tb, Dy, Ho, Er, Tm) and the suppression of superconductivity in LuB{sub 12}.},

  doi          = {10.1134/S1063776111080103},

  url          = {https://www.osti.gov/biblio/22028020},
  journal      = {Journal of Experimental and Theoretical Physics},

  issn         = {1063-7761},

  number       = 3,

  volume       = 113,

  place        = {United States},

  year         = {2011},

  month        = {9}

}

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