Charge density waves, superconductivity and their coexistence
Certain phenomena in the physics of some classes of superconductors can be explained by the coexistence of the superconductivity with another order. This regards namely the cuprates and the recently discovered iron-based superconductors, both having a high critical temperature. In this work we inves...
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| Typ dokumentu: | VŠ práce nebo rukopis |
| Jazyk: | Angličtina |
| Vydáno: |
2010.
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| Témata: | |
| On-line přístup: | http://is.muni.cz/th/106546/prif_m/ |
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| 100 | 1 | |a Chvátal, Lukáš |% UČO 106546 |* [absolvent PřírF MU] |4 dis | |
| 242 | 1 | 0 | |a Vlny nábojové hustoty, supravodivost a jejich koexistence |y cze |
| 245 | 1 | 0 | |a Charge density waves, superconductivity and their coexistence |h [rukopis] / |c Lukáš Chvátal. |
| 260 | |c 2010. | ||
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| 500 | |a Vedoucí práce: Dominik Munzar. | ||
| 502 | |a Diplomová práce (Mgr.)--Masarykova univerzita, Přírodovědecká fakulta, 2010. | ||
| 520 | 2 | |a Certain phenomena in the physics of some classes of superconductors can be explained by the coexistence of the superconductivity with another order. This regards namely the cuprates and the recently discovered iron-based superconductors, both having a high critical temperature. In this work we investigate the possibilities of the coexistence of the supercondictivity and the charge density wave order, using an idealised BCS-like model in the mean-field approximation. We focus on a two-dimensional system with a second-nearest-neighbour tight-binding dispersion and assume pairing interactions leading to the s-wave symmetry of the order parameter. We derive the coupled equations for the order parameters (Balseiro-Falicov model) using the method of Green functions and present their solutions in form of the phase diagrams for various parameter combinations. |% cze | |
| 520 | 2 | 9 | |a Jevy pozorované v některých skupinách supravodičů, například kuprátech či supravodičích založených na sloučeninách železa, mohou být vysvětleny koexistencí supravodivosti s jinou fází. V této práci se zabýváme koexistencí supravodivosti s vlnami nábojové hustoty, jež modelujeme pomocí jednoduchého modelu typu BCS v přiblížení středního pole. Dle modelu Balseira-Falicova odvozujeme pomocí metody Greenových funckí rovnice pro parametry pořádku, zobecněné pro konečné teploty. Z jejich řešení konstrujeme fázové diagramy pro různé kombinace parametrů modelu. |9 eng |
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| 710 | 2 | |a Masarykova univerzita. |b Přírodovědecká fakulta. |b Fyzikální sekce |7 kn20020321517 |4 dgg | |
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