Lithium hydride single crystal growth by bridgman-stockbarger method using ultrasound

Tyutyunnik, O. I.; Tyutyunnik, V. I.; Шульгин, Б. В.; Oparin, D.V.; Pilipenko, G. I.; Gavrilov, F. F.

doi:10.1016/0022-0248(84)90113-1

Cited by 24 publications

(6 citation statements)

References 6 publications

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“…Specimens of LiH, LiD, LiH x D 1−x (0 x 1) and LiH x F 1−x were grown from the melt using the modified Bridgman-Stockbarger method (see also [22]). This technique has been described many times previously (see, e.g.…”

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confidence: 99%

Direct observation of the effect of isotope-induced disorder on the exciton binding energy in LiH_xD_1−xmixed crystals

Plekhanov¹

2007

J. Phys.: Condens. Matter

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The results of the quantitative study of the renormalization of binding energy the Wannier -Mott exciton by the isotope effect are present for the first time. For this purpose accurate measurements of the intrinsic luminescence and mirror reflection spectra of LiH x D 1−x mixed crystals with a clean surface in the temperature range 2 -100 K were carried. Nonlinear dependence of exciton binding energy E b on the isotope mass E b ∼ f(x) is caused by the bands fluctuation broadening which is connected with the isotopeinduced-disorder. Temperature dependence of exciton binding energy is briefly discussed. The extrapolation of the asymptotic linear behavior of the exciton maximum energy to T = 0 K enables to estimate the zero -point renormalization of the exciton binding energy. PACS: 32.10B; 71.20P; 78.20; 78.40F.A wide variety of novel isotope effects have been discovered on last four decades [1][2][3][4][5][6] owing to the availability of high-quality bulk semiconductor and insulator crystals with controlled isotopic composition (see, also, reviews [7-10]). Recent high resolution spectroscopic studies of excitonic and impurity transitions in high-quality samples of isotopically enriched Si have discovered the broadening bound excitons emission (absorption) lines connected with isotopeinduced-disorder as well as the dependence of their binding energy on the isotope mass [11][12][13]. The last effect was early observed on the bound excitons in diamond [14-15] and more earlier on the free excitons in LiH x D 1−x mixed crystals [16].As is well-known (see, for example [16,17,4]) the band gap energy E g in the T−→0 limit has a dependence on the average isotopic mass M due to two effects: a) the renormalization of E g by the electron-phonon interaction coupled with the dependence of the zero-point amplitudes on M (see, also [18]) and b) the dependence of the lattice constant on M , leading to a change in E g through the hydrostatic deformation potential. The electron-phonon term is dominant [19,20] and in the case of semiconductor crystals (C; Ge; Si) with a weak isotope scattering potential is varied approximately as M −1/2 . The value of the T =0 electron-phonon renormalization energy contribution to E g can be independly determined from an extrapolation of the high temperature linear dependence 1

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confidence: 99%

Direct observation of the effect of isotope-induced disorder on the exciton binding energy in LiH_xD_1−xmixed crystals

Plekhanov¹

2007

J. Phys.: Condens. Matter

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“…The single crystals of LiH and LiD were grown from the melt by the modified method of Bridgeman -Stockbarger (see and references quoted therein) [8,11]. The crystals were synthesized from 7 Li metal and hydrogen of 99.7% purity and deuterium of 99.5% purity.…”

Section: Resultsmentioning

confidence: 99%

Non - Accelerator Observation of the Long - Range Strong Nuclear Interaction

Plekhanov¹,

Lab.²

2020

J Phy Opt Sci

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The non - accelerator observation of the long - range strong nuclear interaction is presented. We have studied the low - temperature spectra (reflection and luminescence) of the LiH (without strong interaction in hydrogen nucleus) and LiD (with strong interaction in deuterium nucleus) crystals which are different by term of one neutron from each other. The experimental observation of isotopic shift (103 meV) of the phononless free excitons emission line in LiD crystals is a direct manifestation of the long - range strong nuclear interaction. Such conclusion is made to the fact that the gravitation, electromagnetic and weak interactions are the same in both kind crystals, it only emerges the strong interaction in deuterium nucleus. As far as Born - Oppenheimer approximation does not work in isotope effect, we tentative connect our experimental observation with long - range hadron - lepton interaction. Most important study of the LiHx D1-x mixed crystals is the first measurement of the long - range force dependence of strong nuclear interaction on the distance between nucleons in deuterium nucleus

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“…On annealing for several days (up to 20) at 500 0 C under ∼ 3 atm of hydrogen or deuterium, this color could be almost completely eliminated (Fig. 3, the more detail see [3,9]).…”

Section: Methodsmentioning

confidence: 99%

“…The single crystals of LiH and LiD were grown from the melt by the modified method of Bridgeman -Stockbarger [9]. The crystals were synthesized from 7 Li metal and hydrogen of 99.7% purity and deuterium of 99.5% purity.…”

Section: Methodsmentioning

confidence: 99%

Renormalization the Energy of Elementary Excitations in Solids by the Strong (Nuclear) Interaction

Plekhanov¹

2017

ujpa

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The experimental evidence of renormalization the energy of the elementary excitations in solids which are differ by term of one neutron from each other by the strong (nuclear) interaction has been presented for the first time. This evidence is based on two independent results: 1) The increase exciton energy on 103 meV is caused by the adding of one neutron (using LiD crystals instead LiH ones); 2) After increasing the amounts by one neutron the energy of LO phonons has decreased by 36 meV. The last one is directly seen from luminescence and scattering spectra. As far as the gravitation, electromagnetic and weak interactions are the same in both of kind crystals, it only changes the strong interaction. Therefore a logical conclusion is made that the renormalization of the energy of electromagnetic excitations (excitons, phonons) is carried out by the strong (nuclear) interaction.

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Lithium hydride single crystal growth by bridgman-stockbarger method using ultrasound

Cited by 24 publications

References 6 publications

Direct observation of the effect of isotope-induced disorder on the exciton binding energy in LiH_xD_1−xmixed crystals

Direct observation of the effect of isotope-induced disorder on the exciton binding energy in LiH_xD_1−xmixed crystals

Non - Accelerator Observation of the Long - Range Strong Nuclear Interaction

Renormalization the Energy of Elementary Excitations in Solids by the Strong (Nuclear) Interaction

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Lithium hydride single crystal growth by bridgman-stockbarger method using ultrasound

Cited by 24 publications

References 6 publications

Direct observation of the effect of isotope-induced disorder on the exciton binding energy in LiHxD1−xmixed crystals

Direct observation of the effect of isotope-induced disorder on the exciton binding energy in LiHxD1−xmixed crystals

Non - Accelerator Observation of the Long - Range Strong Nuclear Interaction

Renormalization the Energy of Elementary Excitations in Solids by the Strong (Nuclear) Interaction

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Direct observation of the effect of isotope-induced disorder on the exciton binding energy in LiH_xD_1−xmixed crystals

Direct observation of the effect of isotope-induced disorder on the exciton binding energy in LiH_xD_1−xmixed crystals