caa a22 4500 445382686 CHVBK 20180317143022.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10948-010-1081-5 doi (NATIONALLICENCE)springer-10.1007/s10948-010-1081-5 Griffiths Phase and Disorder in Perovskite Manganite Oxides La1− x Ca x MnO3 and La0.7Sr0.3MnO3 [Elektronische Daten] [Hongguang Zhang, Lingshan Chen, Yongtao Li, Hao Liu, Yuanyuan Chen, Kai Chen, Xueguang Dong, Hao Yang, Tianyou Gao, Qi Li] Polycrystalline samples La1−x Ca x MnO3 (x=0.17, 0.15, 0.10) and La0.7Sr0.3MnO3 were prepared in order to investigate the Griffiths-like features induced by disorder compared with their counterpart single crystals. The magnetization data exhibit the traditional transition from ferromagnetic phase to paramagnetic phase. From the temperature dependence of inverse susceptibility, it can be testified that the Griffiths-like features still exist in as-prepared Ca doped samples, while non-Griffiths-like features exist in La0.7Sr0.3MnO3. All these samples, however, exhibit the large effective spins resulting from formation of the short-order ferromagnetic clusters. The O K-edge X-ray absorption spectra indicate the Jahn-Teller (J-T) distortions are definitely present due to the J-T ion Mn3+, which indicate that static J-T distortion is not a sufficient condition for the existence of Griffiths phase in Sr-doped system. And, the size of J-T distortion is a little larger in polycrystalline La0.7Sr0.3MnO3 than that in polycrystalline samples La1−x Ca x MnO3 (x=0.17, 0.15, 0.10), revealed by X-ray diffraction parameters and extended X-ray fine structure absorption data of Mn K-edge. It also testifies that the disorder in La0.7Sr0.3MnO3 caused by both chemical doping and J-T distortions is lower than that in polycrystalline samples La1−x Ca x MnO3, which may be the reason of non-Griffiths-like phase existing in La0.7Sr0.3MnO3 samples. Springer Science+Business Media, LLC, 2010 Griffiths phase nationallicence Manganite oxides nationallicence Disorder nationallicence Jahn-Teller (J-T) distortions nationallicence XAFS nationallicence Zhang Hongguang Physics Department, Southeast University, 211189, Nanjing, P.R. China aut Chen Lingshan Physics Department, Southeast University, 211189, Nanjing, P.R. China aut Li Yongtao Physics Department, Southeast University, 211189, Nanjing, P.R. China aut Liu Hao Physics Department, Southeast University, 211189, Nanjing, P.R. China aut Chen Yuanyuan Physics Department, Southeast University, 211189, Nanjing, P.R. China aut Chen Kai Physics Department, Southeast University, 211189, Nanjing, P.R. China aut Dong Xueguang Physics Department, Southeast University, 211189, Nanjing, P.R. China aut Yang Hao Physics Department, Southeast University, 211189, Nanjing, P.R. China aut Gao Tianyou Physics Department, Southeast University, 211189, Nanjing, P.R. China aut Li Qi Physics Department, Southeast University, 211189, Nanjing, P.R. China aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1665-1672 1557-1939 24:5<1665 2011 24 10948 https://doi.org/10.1007/s10948-010-1081-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-1081-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhang Hongguang Physics Department, Southeast University, 211189, Nanjing, P.R. China aut NATIONALLICENCE 700 1- Chen Lingshan Physics Department, Southeast University, 211189, Nanjing, P.R. China aut NATIONALLICENCE 700 1- Li Yongtao Physics Department, Southeast University, 211189, Nanjing, P.R. China aut NATIONALLICENCE 700 1- Liu Hao Physics Department, Southeast University, 211189, Nanjing, P.R. China aut NATIONALLICENCE 700 1- Chen Yuanyuan Physics Department, Southeast University, 211189, Nanjing, P.R. China aut NATIONALLICENCE 700 1- Chen Kai Physics Department, Southeast University, 211189, Nanjing, P.R. China aut NATIONALLICENCE 700 1- Dong Xueguang Physics Department, Southeast University, 211189, Nanjing, P.R. China aut NATIONALLICENCE 700 1- Yang Hao Physics Department, Southeast University, 211189, Nanjing, P.R. China aut NATIONALLICENCE 700 1- Gao Tianyou Physics Department, Southeast University, 211189, Nanjing, P.R. China aut NATIONALLICENCE 700 1- Li Qi Physics Department, Southeast University, 211189, Nanjing, P.R. China aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1665-1672 1557-1939 24:5<1665 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer