A new structure in the REBaCuFeO_(5+#delta#) series: LaBaCuFeO_(5+#delta#) Structure and magnetic properties in the La_(1-x)Pr_xBaCuFeO_(5+#delta#) system

H. Pardo; W.A. Ortiz; F.M. Araujo-Moreira; L. Suescun; B. Toby; E. Quagliata; C.A. Negreira; K. Prassides; A.W. Mombru

首页> 外文期刊>Physica, C. Superconductivity and its applications >A new structure in the REBaCuFeO_(5+#delta#) series: LaBaCuFeO_(5+#delta#) Structure and magnetic properties in the La_(1-x)Pr_xBaCuFeO_(5+#delta#) system

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A new structure in the REBaCuFeO_(5+#delta#) series: LaBaCuFeO_(5+#delta#) Structure and magnetic properties in the La_(1-x)Pr_xBaCuFeO_(5+#delta#) system

机译：REBaCuFeO_（5 +＃delta＃）系列的新结构：LaBaCuFeO_（5 +＃delta＃）La_（1-x）Pr_xBaCuFeO_（5 +＃delta＃）系统的结构和磁性能

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The crystal structure of LaBaCuFeO_(5+#delta#) is determined by neutron powder diffraction at 15 K and the structure and magnetic properties of the La_(1-x)Pr_xBaCuFeO_(5+#delta#) system are studied by AC-susceptibility measurements and RT~(57)Fe Mossbauer spectroscopy. The best fit using the Rietveld method is obtained for an orthorhombic model in space group I mmm with with unit cell parameters a = 505586(8) A, b = 5.5550(9) A and c = 7.8155(2)A. The main feature of this model is a disordered structure where the oxygen atom vacancies play an important role. The magnetic susceptibility in the La_(1-x)Pr_xBaCuFeO_(5+#delta#) system is studied and T_f, #mu#_(eff) and #THETA# are determined. Mossbauer spectra provide information relative to the iron electronic state and environment. They support the hypothesis of the key role that the oxygen atom positions play in the magnetic properties of the system by affecting the superexchange interactions in the network.

机译：通过15 K的中子粉末衍射确定LaBaCuFeO_（5 +＃delta＃）的晶体结构，并通过交流磁化率研究La_（1-x）Pr_xBaCuFeO_（5 +＃delta＃）系统的结构和磁性。测量和RT〜（57）Fe Mossbauer光谱。使用Rietveld方法的最佳拟合是针对空间单元为I mmm的斜方模型，其单元像元参数为a = 505586（8）A，b = 5.5550（9）A和c = 7.8155（2）A。该模型的主要特征是无序结构，其中氧原子空位起重要作用。研究了La_（1-x）Pr_xBaCuFeO_（5 +＃delta＃）系统中的磁化率，并确定了T_f，＃mu #_（eff）和＃THETA＃。 Mossbauer光谱提供有关铁电子状态和环境的信息。他们支持以下假设：氧原子位置通过影响网络中的超交换相互作用而在系统的磁性中发挥关键作用。

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《Physica, C. Superconductivity and its applications》 |1999年第2期|共10页
作者
H. Pardo; W.A. Ortiz; F.M. Araujo-Moreira; L. Suescun; B. Toby; E. Quagliata; C.A. Negreira; K. Prassides; A.W. Mombru;
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正文语种 eng
中图分类超导电性;
关键词
YBaCuFeO_5; neutron diffraction; structure; magnetism;

机译：YBaCuFeO_5;中子衍射;结构;磁性;

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1. A new structure in the REBaCuFeO_(5+#delta#) series: LaBaCuFeO_(5+#delta#) Structure and magnetic properties in the La_(1-x)Pr_xBaCuFeO_(5+#delta#) system [J] . H. Pardo, W.A. Ortiz, F.M. Araujo-Moreira, Physica, C. Superconductivity and its applications . 1999,第1a2期

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A new structure in the REBaCuFeO_(5+#delta#) series: LaBaCuFeO_(5+#delta#) Structure and magnetic properties in the La_(1-x)Pr_xBaCuFeO_(5+#delta#) system

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