The temperature dependence of the local structure of the CuO2 plane in La1.85Sr0.15CuO4 has been studied by in-plane polarized Cu K edge extended X-ray absorption fine structure (EXAFS). The high signal-to-noise ratio in the E parallel to ab EXAFS allows us to separate the contributions of Cu-O(planar), Cu-O-Cu and Cu-La/Sr shells and to study their temperature dependence in the low-temperature orthorhombic (LTO) phase. We have observed an anomalous behavior of the local structure below 100 K with clear anomalies at similar to T-c (35 K) and T* (similar to 1.6T(c)) that are not expected on the basis of the average structure. These results suggest that the structure of the CuO2 plane is non-homogeneous and it shows anomalous changes at T* and T-c.

Local Lattice Instabillity of CuO2 plane in La 1.85Sr0.15CuO4 by Polarized Cu K edge Absorption / Saini, Naurang Lal; A., Lanzara; M., Missori; T., Rossetti; Bianconi, Antonio; H., Oyanagi; H., Yamaguchi; K., Oka; T., Ito. - In: PHYSICA. C, SUPERCONDUCTIVITY. - ISSN 0921-4534. - STAMPA. - 251(1995), pp. 383-388. [10.1016/0921-4534(95)00391-6]

Local Lattice Instabillity of CuO2 plane in La 1.85Sr0.15CuO4 by Polarized Cu K edge Absorption

SAINI, Naurang Lal;BIANCONI, Antonio;
1995

Abstract

The temperature dependence of the local structure of the CuO2 plane in La1.85Sr0.15CuO4 has been studied by in-plane polarized Cu K edge extended X-ray absorption fine structure (EXAFS). The high signal-to-noise ratio in the E parallel to ab EXAFS allows us to separate the contributions of Cu-O(planar), Cu-O-Cu and Cu-La/Sr shells and to study their temperature dependence in the low-temperature orthorhombic (LTO) phase. We have observed an anomalous behavior of the local structure below 100 K with clear anomalies at similar to T-c (35 K) and T* (similar to 1.6T(c)) that are not expected on the basis of the average structure. These results suggest that the structure of the CuO2 plane is non-homogeneous and it shows anomalous changes at T* and T-c.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/257218
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