Autor: Wysokiński, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Off-Diagonal Nonmagnetic Disorder in s- and d-Wave Superconductors
Autorzy:: Michalik, M.
Wysokiński, K. I.
Powiązania:: https://bibliotekanauki.pl/articles/2046788.pdf
Data publikacji:: 2006-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.-w
71.23.-k
74.20.-z
Opis:: The previously developed approach to study off-diagonal disorder has been extended and applied to both s- and d-wave superconductors. The derived equations allow the self-consistent solution of the problem. For a special case of negative U centres embedded in non-superconducting host we have calculated their critical concentration for the appearance of superconductivity and found it equal to≈0.4. For x>x$\text{}_{cr}$ the order parameter continuously increases to its maximal value at x=1.
Źródło:: Acta Physica Polonica A; 2006, 109, 4-5; 623-626
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: The Isotope Effect of Disordered Superconductors
Autorzy:: Mierzyńska, M.
Wysokiński, K. I.
Powiązania:: https://bibliotekanauki.pl/articles/2038392.pdf
Data publikacji:: 2004-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.25.Bt
74.62.-c
74.62.Dh
Opis:: The isotope effects in disordered weak and strong coupling superconductors of different symmetries of the order parameter have been studied. We have found that even though weak localisation corrections to Eliashberg equations describe a strong degradation of transition temperature with disorder of s-wave superconductors, their influence on isotope coefficient is relatively weak. On the other hand the calculated change of relative isotope coefficient with T$\text{}_{c}$/T$\text{}_{c0}$ in homogeneous thin film materials is similar to that observed in high temperature superconductors.
Źródło:: Acta Physica Polonica A; 2004, 106, 5; 647-652
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: CPA Theory of Superconducting Alloys with Diagonal and Off-Diagonal Disorder
Autorzy:: Michalik, M.
Wysokiński, K. I.
Powiązania:: https://bibliotekanauki.pl/articles/2038393.pdf
Data publikacji:: 2004-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.-w
71.23.-k
74.20.-z
Opis:: The general theory of disorder in superconducting alloys was discussed. We use standard Wannier function representation and allow for diagonal and off-diagonal disorder. We generalized the coherent potential approximation in the version able to deal with off-diagonal disorder in normal systems to treat superconducting state. As an illustration we calculate the quasiparticle density of states and gap function of a d-wave superconductor. We show inter alia that the rate at which superconductivity disappears depends on the kind of disorder and for off-diagonal disorder it depends on the details of its realization.
Źródło:: Acta Physica Polonica A; 2004, 106, 5; 653-658
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Spectral Functions of the Quantum Dot Coupled to Normal and/or Superconducting Leads
Autorzy:: Krawiec, M.
Wysokiński, K. I.
Powiązania:: https://bibliotekanauki.pl/articles/2012885.pdf
Data publikacji:: 2000-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
72.15.Qm
71.27.+a
Opis:: We study the spectrum of the quantum dot coupled to two external leads, which may be normal and/or superconducting. The dot is described by the Anderson-Hubbard impurity model in the infinity U limit. The impurity spectral function shows complex behavior depending on the temperature and the state of the leads. For normal leads and at low temperature we observe the appearance of the Kondo resonance, while for BCS-like superconducting leads the bound states emerge due to absence of low energy excitations in the leads.
Źródło:: Acta Physica Polonica A; 2000, 97, 1; 197-200
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Do Van Hove Singularities in Leads Influence Tunneling Current through Quantum Dot?
Autorzy:: Krawiec, M.
Domański, T.
Wysokiński, K. I.
Powiązania:: https://bibliotekanauki.pl/articles/1991636.pdf
Data publikacji:: 1998-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.Gk
72.15.Qm
71.27.+a
Opis:: Using the Landauer type formula for the current through quantum dot we have studied the influence of the singularities in the density of states in leads on the differential conductance of the system and answered affirmatively the above question. The presence of Van Hove singularities in the leads may induce an additional structure on the conductance vs. voltage curve. The dot itself has been described by the single impurity Anderson model with a very strong "on-dot" Coulomb repulsion. We also simulate the effect of electron-phonon interaction in the dot by allowing for the fluctuations of the "impurity" energy level.
Źródło:: Acta Physica Polonica A; 1998, 94, 3; 411-414
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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