LEADER 05417nam 22008415 450 001 9910300407503321 005 20200629201407.0 010 $a4-431-55510-2 024 7 $a10.1007/978-4-431-55510-0 035 $a(CKB)3710000000360450 035 $a(EBL)1998178 035 $a(OCoLC)904248949 035 $a(SSID)ssj0001452283 035 $a(PQKBManifestationID)11789719 035 $a(PQKBTitleCode)TC0001452283 035 $a(PQKBWorkID)11487703 035 $a(PQKB)10256365 035 $a(DE-He213)978-4-431-55510-0 035 $a(MiAaPQ)EBC1998178 035 $a(PPN)184499267 035 $a(EXLCZ)993710000000360450 100 $a20150226d2015 u| 0 101 0 $aeng 135 $aur|n|---||||| 181 $ctxt 182 $cc 183 $acr 200 10$aPseudogap and Precursor Superconductivity Study of Zn doped YBCO$b[electronic resource] /$fby Ece Uykur 205 $a1st ed. 2015. 210 1$aTokyo :$cSpringer Japan :$cImprint: Springer,$d2015. 215 $a1 online resource (102 p.) 225 1 $aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 300 $aDescription based upon print version of record. 311 $a4-431-55509-9 320 $aIncludes bibliographical references. 327 $aIntroduction -- High Temperature Cuprate Superconductors -- Experimental Procedure -- Results and Discussion -- Conclusion. 330 $aIn this thesis, the pseudogap and the precursor superconducting state, which are of great importance in clarifying the superconductivity mechanism in high-temperature cuprate superconductors, are investigated with a c-axis optical study in YBa2(Cu1-xZnx)3Oy. Testing was performed over a wide energy range with smaller temperature intervals for several Zn-substituted samples, as well as for several carrier-doping levels.   A spectral weight (SW) analysis, in which the pseudogap behavior can be separated from the superconducting condensate with the SW transfer to the high-energy region, revealed that the pseudogap is not the precursor of the superconductivity (carriers moving to the high-energy region with pseudogap opening never contribute to the superconducting condensation). Moreover, the high-energy transfer continues even below Tc for the Zn-substituted samples (in which we weaken the superconductivity), which gives evidence to the coexistence of the pseudogap and the superconducting gap below Tc.     On the other hand, the analysis of optical conductivity revealed that a precursor state to superconductivity can be defined at temperatures much higher than Tc. The superconducting carrier density (ns) was calculated for each temperature (above and below Tc) and the results confirmed the existence of ns at temperatures above Tc. The observed real superconducting condensate (ns) above Tc puts a serious constraint on the theory for high- Tc superconductivity. A theory based on an inhomogeneous superconducting state, in which a microscopically phase-separated state in a doped Mott insulator can be observed, is the most plausible candidate. This theory can explain the existence of ns and the observed temperature range for the precursor superconducting state.   The results obtained show that the pseudogap coexists with superconductivity below Tc and is not the precursor of superconductivity. On the other hand, it is also possible to define a precursor superconducting state that is different than the pseudogap. The temperature range and the observed superconducting condensate in this state can be explained with the help of the inhomogeneous superconducting state. 410 0$aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 606 $aSuperconductivity 606 $aSuperconductors 606 $aLow temperature physics 606 $aLow temperatures 606 $aMagnetism 606 $aMagnetic materials 606 $aSolid state physics 606 $aPhysics 606 $aStrongly Correlated Systems, Superconductivity$3https://scigraph.springernature.com/ontologies/product-market-codes/P25064 606 $aLow Temperature Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P25130 606 $aMagnetism, Magnetic Materials$3https://scigraph.springernature.com/ontologies/product-market-codes/P25129 606 $aSolid State Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P25013 606 $aMathematical Methods in Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P19013 615 0$aSuperconductivity. 615 0$aSuperconductors. 615 0$aLow temperature physics. 615 0$aLow temperatures. 615 0$aMagnetism. 615 0$aMagnetic materials. 615 0$aSolid state physics. 615 0$aPhysics. 615 14$aStrongly Correlated Systems, Superconductivity. 615 24$aLow Temperature Physics. 615 24$aMagnetism, Magnetic Materials. 615 24$aSolid State Physics. 615 24$aMathematical Methods in Physics. 676 $a537.623 700 $aUykur$b Ece$4aut$4http://id.loc.gov/vocabulary/relators/aut$0792818 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910300407503321 996 $aPseudogap and Precursor Superconductivity Study of Zn doped YBCO$91773056 997 $aUNINA