Investigation of the crystalline structure of La2−<i>x</i>Sr<i>x</i>CuO4−<i>δ</i> by using the resonance reaction 18O(<i>p</i>,<i>α</i>) 15N
Vladimir I. MakarovPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovR.P. SlabospitskiiPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovN.A. SkakunPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovA. S. BorovikPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovA. P. VoronovPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovA.Yu. GrinchenkoPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovВ. С. МалышевскийPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovV. A. OLEINIKPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Аннотация
A comparison of experimental results with the theory shows that the oxygen subsystem in a La2−x Srx. CuO4−δ crystal exhibits peculiar properties: it is noticeably disordered (20%) relative to copper and lanthanum atoms which have a practically perfect arrangement; the amplitude of thermal vibrations of oxygen atoms in a plane perpendicular to the [001] axis in La–Cu–O chains is much larger than the corresponding value for oxygen atoms in O–O chains.
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