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Effect of alkali-earth ions on local structure of the LaAlO₃--La_0.67A_0.33MnO₃ (A=Ca, Sr, Ba) diluted solid solutions: ²⁷Al NMR studies

Charnaya E.V.¹, Tien Cheng², Chejina N.V.³, Lee M.K.², Sun S.Y.²

¹Institute of Physics, St. Petersburg State University, St. Petersburg, Petrodvorets, Russia
²Department of Physics, National Cheng Kung University, Tainan Taiwan
³Department of Chemistry, St. Petersburg State University, St. Petersburg, Petrodvorets, Russia

Email: charnaya@paloma.spbu.ru

Поступила в редакцию: 11 мая 2006 г.

Выставление онлайн: 17 февраля 2007 г.

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²⁷Al Magic Angle Spinning (MAS) NMR was studied for diluted alkali-earth metal doped lanthanum manganite solid solutions in the lanthanum aluminate (1-y)LaAlO₃--yLa_0.67A_0.33MnO₃ (A=Ca, Sr, Ba) with y=0,2,3, and 5 mol%. The spectra depended on the dopant species and showed higher substitutional ordering for the Ba containing mixed crystals. Magnetically shifted lines were observed in all solid solutions and were attributed to Al in the octahedral oxygen environment near manganese trivalent ions. Nonlinear dependences of their intensity were referred to the manganese-rich cluster formation. An additional MAS NMR line corresponding to aluminum at sites different from the octahedral site in pure LaAlO₃ was observed only in solutions doped with Ba. 3Q MAS NMR revealed the the broadening of this line is governed mainly by quadrupole coupling and allowed calculating the isotropic chemical shift. The present work was supported by the National Science Council of Taiwan under Grant 93-2811-M-006-021. PACS: 76.60.-k, 61.66.-f

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