title: A Cu(2+) ion-F center complex view on the photoluminescence quenching and correlating ferrimagnetism in (Cu2(+)/Cu1(2+))(0.044)Zn(0.956)O electrospun nanobelts.
abstract: Unlike to the most previous reports, mixed-cation Cu(+)/Cu(2+) doping-induced novel nanoscale phenomena, including photoluminescence quenching and a correlating ferrimagnetism with Néel temperature ≈ 14 K, were found in the as-calcined (Cu2(+)/Cu1(2+))0.044Zn0.956O electrospun nanobelts (NBs). There is also high strain (up to 1.98%) and shrunk lattice distortion (ΔV/V0 ∼ 0.127%) in the (Cu2(+)/Cu1(2+))0.044Zn0.956O NBs, leading to broken lattice symmetry in conjunction with nonstoichiometry (i.e., oxygen vacancies or accurate F centers), which could be possible origins of ferrimagnetism in the Cu-doped ZnO NBs. Electron paramagnetic resonance spectra reveal that there are giant and anisotropic g factors, suggesting that there is strong anisotropic spin-orbit interaction between the Cu(2+) ion and F center (i.e., forming Cu(2+)-F(+) complexes) in the (Cu2(+)/Cu1(2+))0.044Zn0.956O NBs. The above correlation enables the potential application of tuning of the optical and ferrimagnetic properties through strain and F-center engineering.
authors.affiliation: Department of Physics and ‡State Key Laboratory of Silicon Materials, Zhejiang University , Hangzhou 310027, People's Republic of China.
authors.forename: Jian-Min
authors.initials: JM
authors.lastname: Li
authors.forename: Xian-Lin
authors.initials: XL
authors.lastname: Zeng
authors.forename: Dan-Ping
authors.initials: DP
authors.lastname: Wei
authors.forename: Yun-Bing
authors.initials: YB
authors.lastname: Hu
authors.forename: Zhu-An
authors.initials: ZA
authors.lastname: Xu