Doping n-type carriers by La-substitution for Ba in YBa_2Cu_3O_y system

Simple item page
dc.creatorSegawa, Kouji
dc.creatorAndo, Yoichi
dc.date2006-08-16
dc.date2006-09-12
dc.date.accessioned2026-07-07T07:19:42Z
dc.date.available2026-07-07T07:19:42Z
dc.descriptionThus far, there is no cuprate system where both n-type and p-type charge carriers can be doped without changing the crystallographic structure. For studying the electron-hole symmetry in an identical structure, we try to dope n-type carriers to YBa2Cu3Oy system by reducing oxygen content and substituting La3+ ions for Ba2+. Single crystals of La-doped YBa2Cu3Oy are grown by a flux method with Y2O3 crucibles and it is confirmed that La actually substitutes \~13% of Ba. The oxygen content y can be varied between 6.21 and 6.95 by annealing the crystals in an atmosphere with controlled oxygen partial pressure. The in-plane resistivity rho_ab at room temperature was found to increase with decreasing oxygen content y down to 6.32, but interestingly further decrease in y results in a decrease in rho_ab. The most reduced samples with y = 6.21 show rho_ab of ~30 mOhm cm at room temperature, which is as much as seven orders-of-magnitude smaller than the maximum value at y = 6.32. Furthermore, both the Hall coefficient and the Seebeck coefficient of the y = 6.21 samples are found to be negative at room temperatures. The present results demonstrate that the non-doped Mott-insulating state has been crossed upon reducing y and n-type carriers are successfully doped in this material.
dc.description4 pages, 4 figures, 1 table, accepted for publication in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0608349
dc.identifierhttp://arxiv.org/abs/cond-mat/0608349
dc.identifierPhys. Rev. B 74, 100508 (2006)
dc.identifierdoi:10.1103/PhysRevB.74.100508
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/114720
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleDoping n-type carriers by La-substitution for Ba in YBa_2Cu_3O_y system
dc.typetext

Files

Collections

arXiv