Role of Bi/Tm substitution in Bi-2212 system on crystal structure quality, pair wave function and polaronic states

Basit Öğe Kaydı
dc.authorid0000-0002-7112-5607en_US
dc.authorid0000-0003-0304-1097en_US
dc.authorid0000-0002-3944-0367
dc.authorid0000-0002-5177-3703
dc.authorid0000-0003-0049-0161
dc.contributor.authorÜlgen, Asaf Tolga
dc.contributor.authorTurğay, Tahsin
dc.contributor.authorTerzioğlu, Cabir
dc.contributor.authorYıldırım, Gürcan
dc.contributor.authorÖz, Muhammed
dc.date.accessioned2021-06-23T19:49:27Z
dc.date.available2021-06-23T19:49:27Z
dc.date.issued2018
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümüen_US
dc.description.abstractThis comprehensive study finds strongly out the crucial variations in the dc electrical resistivity, superconducting, crystal structural and flux pinning mechanisms with the partial replacement of homovalent Tm+3 inclusions by Bi+3 impurity in the active layers of Bi-2212 superconducting material. Materials of type Bi2.1-xTmxSr2.0Ca1.1Cu2.0Oy with molar ratio changes of 0.00 <= x <= 0.30 are prepared by conventional solid-state reaction route in atmospheric pressure and the characterizations are exerted by the bulk density, dc electrical resistivity (rho-T), powder X-ray diffraction (XRD), critical current density (J(c)), scanning electron microscopy (SEM) and electron dispersive X-ray (EDX) experimental measurements. The combination of experimental results evaluated from the bulk density, dc electrical resistivity, XRD and EDX measurements points out that the Tm foreign impurities mostly incorporate successfully into the Bi-2212 crystal lattice. In fact, the EDX investigations verify that the thulium impurities may mostly be substituted for the bismuth sites in the crystal structure. All the experimental results declare that the characteristic features improve regularly with the increment in the Tm impurity level up to x = 0.07 beyond which the properties degrade dramatically. In this respect, the sample with x = 0.07 exhibits highest electrical conductive/metallic characteristics as a consequence of the refinement in the crystal structure quality and connectivity between the superconducting grains, being favored by bulk density and related relative degrees of granularity surveys. Likewise, the material presents the maximum offset-onset critical transition temperature values of 85.61 K-85.85 K due to the increment in the formation of effective and strong electron-phonon coupling probabilities and optimization of mobile hole carrier concentrations in the Cu-O-2 consecutively stacked layers. In other words, the optimum content level leading to transit inherently over-doped nature into optimally doped state strengthens the amplitude of pair wave function for the Bi-2212 material. In more sophisticated interpretations, the presence of optimum dopant in the crystal structure changes the vibrational mode intensities of O (1)CuA1g, B1g phonons and O (2)SrA1g phonon so that the formation possibility of bipolaron out of two polarons increases strongly in a polarizable lattice (polaronic effect). Additionally, the highest self-field J(c) of 95 A/cm(2) confirms the fact that the optimum dopant augments the effective nucleation centers along the intragrain and inter-grain boundaries in the crystal system. Similarly, the material prepared with x = 0.07 presents the smoothest, densest, largest average crystalline distribution, lowest porosity and most uniform surface appearance with the finest connection between the superconducting grains. The XRD results (the increased high phase, c-axis length and average grain size but decreased a-axis length) also show the optimum dopant level of x = 0.07 for Bi-2212 crystal system. All in all, the paper developing a strong methodology about why the characteristic properties improve with the presence of Tm impurity in the Bi-2212 system may be a pioneering research to construct newly, novel and feasible market areas for the Bi-2212 superconducting ceramics in the universe economy. (C) 2018 Elsevier B.V. All rights reserved.en_US
dc.identifier.doi10.1016/j.jallcom.2018.06.142
dc.identifier.endpage766en_US
dc.identifier.issn0925-8388
dc.identifier.issn1873-4669
dc.identifier.scopus2-s2.0-85048726694en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage755en_US
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2018.06.142
dc.identifier.urihttps://hdl.handle.net/20.500.12491/9507
dc.identifier.volume764en_US
dc.identifier.wosWOS:000444058300091en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorTerzioğlu, Cabir
dc.institutionauthorYıldırım, Gürcan
dc.institutionauthorÖz, Muhammed
dc.language.isoenen_US
dc.publisherElsevier Science Saen_US
dc.relation.ispartofJournal Of Alloys And Compoundsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectBi-2212 Superconducting Ceramicen_US
dc.subjectBi/Tm Partial Substitutionen_US
dc.subjectCrystal Structure Qualityen_US
dc.subjectOptimally Doped Stateen_US
dc.subjectPolaronic Effecten_US
dc.subjectEffective Nucleation Centersen_US
dc.titleRole of Bi/Tm substitution in Bi-2212 system on crystal structure quality, pair wave function and polaronic statesen_US
dc.typeArticleen_US

Dosyalar

Orijinal paket
Listeleniyor 1 - 1 / 1
Küçük Resim Yok
İsim:
a-t-ulgen.pdf
Boyut:
1.37 MB
Biçim:
Adobe Portable Document Format
Açıklama:
Tam Metin/Full Text
İndir

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu
Fizik Bölümü Koleksiyonu
Kimya ve Kimyasal İşleme Teknolojileri Bölümü
Makine Mühendisliği Bölümü Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu