Effects of disorder and isotopic substitution in the specific heat and Raman scattering in LuB12 View Full Text


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Article Info

DATE

2011-09

AUTHORS

N. E. Sluchanko, A. N. Azarevich, A. V. Bogach, I. I. Vlasov, V. V. Glushkov, S. V. Demishev, A. A. Maksimov, I. I. Tartakovskii, E. V. Filatov, K. Flachbart, S. Gabani, V. B. Filippov, N. Yu. Shitsevalova, V. V. Moshchalkov

ABSTRACT

Precision measurements of the specific heat and spectral intensity I(ω) of Raman scattering for LuNB12 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(ω) 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 Lu3+ 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 Å, respectively, have been estimated. The vibrational density of states of LuB12 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 YbB12 compound at T < T*, as well as the features of the formation of magnetic structures in RB12 antiferromagnets (R = Tb, Dy, Ho, Er, Tm) and the suppression of superconductivity in LuB12. More... »

PAGES

468

References to SciGraph publications

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  • 2010-05-09. Phonons in ZrB12 in PHYSICS OF THE SOLID STATE
  • 2009-04. Anomalies of magnetoresistance of compounds with atomic clusters RB12 (R = Ho, Er, Tm, Lu) in JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
  • 1977. Structural Determinants in the Higher Borides in BORON AND REFRACTORY BORIDES
  • 1985-06. Structural relaxation effects on the low-temperature properties of vitreous silica in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 2010-08. Singlet-triplet Hamiltonian for spin excitations in a Kondo insulator in JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
  • 2010-08. Isotope effect in charge transport of LuB12 in JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
  • 2005-09. Low Temperature Properties and Superconductivity of LuB12 in JOURNAL OF LOW TEMPERATURE PHYSICS
  • <error retrieving object. in <ERROR RETRIEVING OBJECT
  • 2010-01. Anomalies of the specific heat near the quantum critical point in Tm0.74Yb0.26B12 in JETP LETTERS
  • 2001-07. An EPR study of the temperature dependence of the energy gap in ytterbium dodecaboride in JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
  • <error retrieving object. in <ERROR RETRIEVING OBJECT
  • 2002-01. Point-contact spectroscopy of LuB12 in CZECHOSLOVAK JOURNAL OF PHYSICS
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    19 schema:description Precision measurements of the specific heat and spectral intensity I(ω) of Raman scattering for LuNB12 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(ω) 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 Lu3+ 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 Å, respectively, have been estimated. The vibrational density of states of LuB12 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 YbB12 compound at T < T*, as well as the features of the formation of magnetic structures in RB12 antiferromagnets (R = Tb, Dy, Ho, Er, Tm) and the suppression of superconductivity in LuB12.
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    28 Raman
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    35 boron sublattice
    36 boron vacancies
    37 boson peak
    38 cavity
    39 centrosymmetric positions
    40 clusters
    41 compounds
    42 concentration
    43 correlation length
    44 crystal samples
    45 density
    46 dielectrization
    47 disorders
    48 dodecaborides
    49 effect
    50 effect of disorder
    51 features
    52 first time
    53 formation
    54 heat
    55 intensity
    56 intermediate temperatures
    57 ions
    58 isotopes
    59 isotopic substitution
    60 length
    61 liquid nitrogen temperature
    62 low-frequency part
    63 low-temperature anomalies
    64 magnetic structure
    65 measurements
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    67 nitrogen temperature
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    70 position
    71 potential
    72 precision measurements
    73 properties
    74 samples
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    76 soft atomic potentials
    77 specific heat
    78 spectra
    79 spectral intensity
    80 state
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    84 superconductivity
    85 suppression
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    96 schema:name Effects of disorder and isotopic substitution in the specific heat and Raman scattering in LuB12
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