Isotope effects in lattice dynamics

Plekhanov, V. G.

doi:10.1070/pu2003v046n07abeh001383

Cited by 26 publications

(38 citation statements)

References 168 publications

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“…2, curve 4) and has already been observed earlier in the second-order RS and has been interpreted (see Ref. 7) and references therein) as a local vibration of the hydrogen in LiD crystals. Further we note that as the concentration grows further (x>0:15) one observes in the spectra a decreasing intensity in the maximum of 2LO(À) phonons in LiD crystal with a simultaneous growth in intensity of the highest frequency peak in mixed LiH x D 1Àx crystals ( Fig.…”

Section: Resultssupporting

confidence: 65%

“…The origin of the last one is in the renormalization of LO(À) vibrations in mixed crystals. 7) Comparison of the structure of RS spectra (curves 1 and 2 in Fig. 2) allows us, therefore, to conclude that in the concentration range of 0:1<x<0:45 the RS spectra simultaneously contain peaks of the LO(À) phonon of pure LiD and the LO(À) phonon of the mixed LiH x D 1Àx crystal.…”

Section: Resultsmentioning

confidence: 83%

“…Ref. 7) and references therein) in LiH x D 1Àx mixed crystals, the reverse inequality is valid, i.e. W>jÁj.…”

Section: Resultsmentioning

confidence: 94%

“…LTO causing asymmetry in the shape of the scattering line. 7) This asymmetry also leads to the asymmetric concentration dependence of the half-width of the scattering line. As was shown early (see, e.g.…”

Section: Resultsmentioning

confidence: 99%

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Fundamentals and Applications of Isotope Effect in Modern Technology

Plekhanov¹

2006

J. Nucl. Sci. Technol.

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Different crystals (semiconductors and insulators) with varying isotopic composition have been recently grown. I discuss here the effect of isotopic mass and isotopic disorder on the properties (vibrational, elastic, thermal and optical) of different crystals. The main applications of the stable isotopes are included self-diffusion, neutron transmutative doping (NTD) of different semiconductors, optical fibers, isotope-based quantum computers, etc. Because of space limitations this discussion will not exhaustive. I hope however, to give sufficient references to published work so that the interest reader can easily find the primary literature sources to this rapidly expanding field of solid state physics.

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 83%

“…Ref. 7) and references therein) in LiH x D 1Àx mixed crystals, the reverse inequality is valid, i.e. W>jÁj.…”

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

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Fundamentals and Applications of Isotope Effect in Modern Technology

Plekhanov¹

2006

J. Nucl. Sci. Technol.

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“…The single crystals of LiH and LiD were grown from the melt by the modified method of Bridgeman -Stockbarger (see [7,8] and references quoted therein). The crystals were synthesized from 7 Li metal and hydrogen of 99.7% purity and deuterium of 99.5% purity.…”

Section: Methodsmentioning

confidence: 99%

Nonaccelerator study of the residual nuclear strong interaction

2021

IJTCP

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The present status and recent developments in the nonaccelerator study of residual strong nuclear interaction in solids are briefly reviewed. The emphasis is on new experimental results and they interpretation which were not available in earlier reviews. Artificial activation of the strong interaction by adding of one neutron to the nucleus causes the global reconstruction of the macroscopic characteristics of solids. The experimental evidence of macroscopic manifestation of the strong interaction in optical spectra of solids which is different by term of one neutron from each other (using LiD crystals instead of LiH) has been presented. This evidence is directly seen from luminescence (reflection) and scattering spectra. As far as the gravitation, electromagnetic and weak interactions are the same in both of kind crystals, it only emerges the strong interaction in deuterium nucleus. Therefore a sole conclusion is made that the renormalization of the energy of electromagnetic excitations (electrons, excitons, phonons) is carried out by the strong nuclear interaction. There is a common place in Standard Model of modern physics that the strong nuclear force does not act on leptons. Our experimental results show the violation of this strong conclusion. Moreover, observation of the isotopic shift phononless line in the photoluminescence (reflection) spectra of the whole series of LiHx D1-x mixed crystals is permit to construct change of the strong interaction coupling, α_{s}, in the wide value range. The necessity to take into account the more close relation between quantum chromodynamics and quantum electrodynamics is underlined. In the first step the quantum electrodynamics should be taken into account the strong interaction at the description of elementary excitations (electrons, excitons, phonons) dynamics in solids. Our experimental results open a new avenue in the investigation of the hadron - lepton interaction via study the low - temperature characteristics (reflection, photoluminescence) of solids and may shed light on a number of fundamental puzzles in modern physics, particularly on the unification of forces

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Isotope Effects on the Optical Phonons of Cubic Boron Phosphide

Zhu

Zheng

2023

Physica Status Solidi (b)

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The ratio of boron isotopes (10B and 11B) affects the thermal conductivity of cubic borides because of the phonon scattering. There are two signals appearing in the Raman spectra of cubic boron phosphide (c‐BP) single crystals with natural boron isotope abundance. One is a sharp peak with high intensity and small linewidth, which has been identified as a TO‐LO‐mixed mode; the other is a small peak in the low‐frequency side with quite low intensity and large linewidth, which is difficult to be observed in isotope‐purified crystals and with an unclear origin. Herein, in order to clarify the isotope effects on optical phonons and to identify the origin of the small peak in c‐BP, the Raman spectra of isotope‐tailored c‐BP single crystals in the range from nearly pure c‐10BP to nearly pure c‐11BP are analyzed in detail. Both the frequency and linewidth of the TO‐LO‐mixed mode are closely related to the boron isotope ratio under the isotopic average mass effect and mass disorder effect. The small Raman peak is also isotope dependent. It originates from LO phonon scattering at the non‐origin of the Brillouin zone under the isotopic mass disorder effect.

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Isotope effects in lattice dynamics

Cited by 26 publications

References 168 publications

Fundamentals and Applications of Isotope Effect in Modern Technology

Fundamentals and Applications of Isotope Effect in Modern Technology

Nonaccelerator study of the residual nuclear strong interaction

Isotope Effects on the Optical Phonons of Cubic Boron Phosphide

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