Study of Competing Charge, Spin and Superconducting Orders In Underdoped High-Temperature Superconductors.

dc.contributor.authorDinegde, Urga
dc.date.accessioned2019-05-22T07:20:41Z
dc.date.accessioned2023-11-09T11:25:54Z
dc.date.available2019-05-22T07:20:41Z
dc.date.available2023-11-09T11:25:54Z
dc.date.issued2018-03-02
dc.description.abstractSuperconductivity often emerges in the proximity of, or in competition with, symmetry-breaking ground states such as antiferromagnetism or charge den- sity waves(CDW). A number of materials in the cuprate family, which includes the high transition-temperature(high-Tc) superconductors, show spin and charge density wave order. Thus a fundamental question is to what extent do these or- dered states exist for compositions close to optimal for superconductivity. Recent observations of CDWorder in Y Ba2Cu3Oy and other cuprate families have raised interesting questions regarding the general role of charge modulations and the relation to superconductivity. It was studied that in the system La2􀀀xBaxCuO4 SDW and CDW orders appear to be intertwined with a spatially-modulated superconductivity. Here by developing a model Hamiltonian and by using quan- tum _eld theory Green's function formalism, we obtain mathematical expres- sions for superconductivity order parameter(_), and charge density wave order parameter(W) in under-doped Y Ba2Cu3Oy. We plot the phase diagram of su- perconducting order parameter (_) against temperature(T) for di_erent values of charge density wave orders(W) in under-doped Y Ba2Cu3Oy. The relation- ship between superconductivity(_), charge density wave(W), and spin density wave(M) orders and their critical temperatures is studied theoretically for the under-doped La2􀀀xBaxCuO4 superconductor and plot the phase diagrams of su- perconducting order parameter(_) against temperature(T) for di_erent values of charge density wave(W) and spin density wave(M) orders. Finally, we examine the physics of combined mechanisms for cuprates and pnictides.en_US
dc.identifier.urihttp://10.90.10.223:4000/handle/123456789/18285
dc.language.isoenen_US
dc.publisherAddis Ababa Universityen_US
dc.subjectStudy of Competing Chargeen_US
dc.subjectHigh-Temperature Superconductorsen_US
dc.subjectSuperconducting Stateen_US
dc.subjectZero Resistanceen_US
dc.titleStudy of Competing Charge, Spin and Superconducting Orders In Underdoped High-Temperature Superconductors.en_US
dc.typeThesisen_US

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