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  <doc>
    <id>1380</id>
    <completedYear/>
    <publishedYear>2001</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>349</pageFirst>
    <pageLast>356</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>Kluwer</publisherName>
    <publisherPlace>Dordrecht [u.a.]</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2003-08-21</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Free and spin-polaron states in high-Tc superconductor</title>
    <parentTitle language="eng">Proceedings of the NATO Advanced Research Workshop on Colossal Magnetoresistance and Vibronic Interactions and the XVth International Jahn-Teller Symposium on Vibronic Interactions in Crystals and Molecules, Boston, August 16 - 22, 2000</parentTitle>
    <identifier type="isbn">1-402-00044-8</identifier>
    <enrichment key="UBICOIdent">001715</enrichment>
    <enrichment key="UBICOseries">NATO science series : Sub-series 2, Mathematics, physics and chemistry ; 39</enrichment>
    <editor>
      <firstName>Michael D.</firstName>
      <lastName>Kaplan</lastName>
    </editor>
    <author>
      <firstName>Aleksander</firstName>
      <lastName>Shelkan</lastName>
    </author>
    <submitter>
      <firstName>...</firstName>
      <lastName>Administrator</lastName>
    </submitter>
    <author>
      <firstName>Ernst</firstName>
      <lastName>Sigmund</lastName>
    </author>
    <author>
      <firstName>Vladimir</firstName>
      <lastName>Hizhnyakov</lastName>
    </author>
    <author>
      <firstName>Götz</firstName>
      <lastName>Seibold</lastName>
    </author>
    <collection role="old_institute" number="01049">LS Theoretische Physik</collection>
  </doc>
  <doc>
    <id>26196</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>23</pageNumber>
    <edition/>
    <issue>4</issue>
    <volume>5</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
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    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2020-10-26</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Phase Separation and Pairing Fluctuations in Oxide Materials</title>
    <abstract language="eng">The microscopic mechanism of charge instabilities and the formation of inhomogeneous states in systems with strong electron correlations is investigated. We demonstrate that within a strong coupling expansion the single-band Hubbard model shows an instability towards phase separation and extend the approach also for an analysis of phase separation in the Hubbard-Kanamori hamiltonian as a prototypical multiband model. We study the pairing fluctuations on top of an inhomogeneous stripe state where superconducting correlations in the extended s-wave and d-wave channels correspond to (anti)bound states in the two-particle spectra. Whereas extended s-wave fluctuations are relevant on the scale of the local interaction parameter U, we find that d-wave fluctuations are pronounced in the energy range of the active subband which crosses the Fermi level. As a result, low energy spin and charge fluctuations can transfer the d-wave correlations from the bound states to the low energy quasiparticle bands. Our investigations therefore help to understand the coexistence of stripe correlations and d-wave superconductivity in cuprates.</abstract>
    <parentTitle language="eng">Condensed Matter</parentTitle>
    <identifier type="doi">10.3390/condmat5040065</identifier>
    <identifier type="url">https://www.mdpi.com/2410-3896/5/4/65/htm</identifier>
    <identifier type="issn">2410-3896</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Artikelnummer">65</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <enrichment key="Fprofil">4 Künstliche Intelligenz und Sensorik / Artificial Intelligence and Sensor Technology</enrichment>
    <author>
      <firstName>Andreas</firstName>
      <lastName>Bill</lastName>
    </author>
    <submitter>
      <firstName>Katrin</firstName>
      <lastName>Gregor</lastName>
    </submitter>
    <author>
      <firstName>Vladimir</firstName>
      <lastName>Hizhnyakov</lastName>
    </author>
    <author>
      <firstName>Reinhard K.</firstName>
      <lastName>Kremer</lastName>
    </author>
    <author>
      <firstName>Götz</firstName>
      <lastName>Seibold</lastName>
    </author>
    <author>
      <firstName>Aleksander</firstName>
      <lastName>Shelkan</lastName>
    </author>
    <author>
      <firstName>Aleksei</firstName>
      <lastName>Sherman</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>phase separation</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>cuprate superconductors</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>electronic correlations</value>
    </subject>
    <collection role="institutes" number="1501">FG Computational Physics</collection>
  </doc>
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