Autor: Januszczyk, M. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effect of Oxygen Redistribution on Temperature Dependence of Pseudo-Gap in Underdoped $HoBa_{2}Cu_{3}O_{7-δ}$ Single Crystals
Autorzy:: Vovk, R.
Nazyrov, Z.
Obolenskii, M.
Pinto Simoes, V.
Januszczyk, M.
Latosińska, J.
Tematy:: 74.72.-h; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1493662.pdf Link otwiera się w nowym oknie
Opis:: The effect of annealing at room temperature on the excess conductivity of oxygen deficient $HoBa_2Cu_{3}O_{7 - δ}$ single crystal is studied. It is shown that there is substantial extension of the interval of linear dependence $ρ_{ab}$ (T) and narrowing of the temperature area of the pseudo-gap regime as a result of annealing. The excess conductivity satisfies the exponential temperature dependence in a wide temperature interval. The temperature dependence of the pseudogap is satisfactorily described by the BCS-BEC theoretical model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Compression Changes in Electrical Resistance and Critical Temperature of $Nb_{1-x}Se_2Sn_x$ Single Crystals
Autorzy:: Obolenskiy, M.
Zavgorodniy, A.
Vovk, R.
Nazyrov, Z.
Goulatis, I.
Januszczyk, M.
Latosińska, J.
Tematy:: 74.25.Fy
74.62.Fj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1419810.pdf Link otwiera się w nowym oknie
Opis:: In this work we investigate the influence of hydrostatic pressure (up to 12 kbar) on the critical parameters of $Nb_{1-x}Se_2Sn_x$ (x=0.1 and x=0.15) single crystals. It is shown that a change in the density of states at the Fermi level brings the main contribution to the increase in $T_{c}$ under pressure. Under the effect of hydrostatic pressure, the phonon spectrum is shifted to higher frequencies (narrowed). The estimated Debye temperature is consistent with those obtained from the heat capacity measurements in $NbSe_2$ single crystals. It is shown that upon increasing hydrostatic pressure the mean free path increases and $Nb_{1-x}Se_2Sn_x$ should be considered as the pure limit in the Ginzburg-Landau theory.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Vacancy-Fluorine Clusters in Silicon
Autorzy:: Chroneos, A.
Vovk, R.
Goulatis, I.
Nazyrov, Z.
Pinto Simoes, V.
Januszczyk, M.
Latosińska, J.
Tematy:: 31.15.es
61.72.jd
61.72.uf
61.72.Yx; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1504564.pdf Link otwiera się w nowym oknie
Opis:: Fluorine (F) doping and the formation of F-vacancy $(F_{n}V_{m})$ clusters have been extensively studied in silicon (Si) as they can suppress the transient self-interstitial mediated diffusion of boron (B). Recent experimental studies by Bernardi et al. revealed that there is no significant concentration of $F_{n}V_{m}$ clusters (for n ≥ 4, m ≥ 1) in disagreement with a number of density functional theory studies. In the present study we use electronic structure calculations to evaluate the binding energies of $F_{n}V_{m}$ clusters and $V_{n}$ clusters. The significant binding energies of the $V_{n}$ clusters reveals that the concentration of the large $F_{n}V_{m}$ clusters (n ≥4, m ≥1) will be limited compared to the $V_{n}$ clusters or even smaller clusters.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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