DSpace Repository

Valence fluctuations and disorder effects in strongly correlated electronic systems

Show simple item record

dc.contributor.advisor Vidhyadhiraja, N.S.
dc.contributor.author Kumar, Pramod
dc.date.accessioned 2021-01-28T10:21:34Z
dc.date.available 2021-01-28T10:21:34Z
dc.date.issued 2013
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/handle/123456789/3071
dc.description.abstract In this thesis, we have carried out theoretical investigations of valence fluctuations and disorder effects in strongly correlated electron systems, focusing on heavy fermion materials in particular. The theoretical framework that we have employed is that of dynamical mean field theory (DMFT), which allows the mapping of a lattice model to a self-consistently determined effective impurity problem. We have extended, implemented and applied the semi-analytical, local moment approach to solve the impurity model. The first three chapters have a common theme – namely valence fluctuations driven crossovers and transitions. The periodic Anderson model, a paradigm to understand heavy fermions in rare-earth systems, has been employed in the first chapter to study a valence crossover, and the manifestation of this crossover in optical and transport properties. A detailed comparison to DC and optical transport of several Cerium and Ytterbium based materials yields excellent agreement. The valence crossover investigated in the first chapter can be transformed to valence transitions with an additional term, i.e inter-orbital Coulomb interaction term in the PAM Hamiltonian, leading to an extended periodic Anderson model, that is investigated in chapter two. A valence fluctuations driven quantum critical point is found to exist in realistic parameter regimes. In order to access real systems, one must be able to deal with orbital degeneracy and interorbital correlations. en_US
dc.language.iso English en_US
dc.publisher Jawaharlal Nehru Centre for Advanced Scientific Research en_US
dc.rights © 2013 JNCASR
dc.subject Valence fluctuations en_US
dc.title Valence fluctuations and disorder effects in strongly correlated electronic systems en_US
dc.type Thesis en_US
dc.type.qualificationlevel Doctoral en_US
dc.type.qualificationname Ph.D. en_US
dc.publisher.department Theoretical Sciences Unit (TSU) en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search DSpace


Advanced Search

Browse

My Account