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首页> 外文期刊>Physica, B. Condensed Matter >Neutron powder diffraction study of the nuclear and magnetic structures of LaMn1-xCrxO3.00 (x=0.05, and 0. 15)
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Neutron powder diffraction study of the nuclear and magnetic structures of LaMn1-xCrxO3.00 (x=0.05, and 0. 15)

机译：LaMn1-xCrxO3.00（x = 0.05，and 0. 15）的核和磁结构的中子粉末衍射研究

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摘要

A comparative study of the nuclear and magnetic structures of LaMn1-x,CrxO3.00 perovskite (x = 0.05, and 0.15) is reported. Cr3+ is isoelectronic with Mn4+ (3d(3)) and is also a non-Jahn-Teller ion. Both magnetic ions increase the hole (empty e(g) levels) concentration and decrease the Jahn-Teller distortion. To characterize the interaction established between Mn3+ and Cr3+ and the effect of Cr3+ on the magnetic structure, samples without Mn4+ were synthesized. X-ray powder diffraction, at room temperature, reveals the existence of single phase materials with orthorhombic symmetry (Pnma) for all the studied samples. Magnetic data shows an increase of the FM interaction with Cr content. Magnetic phases change from A-type antiferromagnetic order to a system with magnetic clusters through a spin-glass-like phase. In order to fully understand the magnetic phase diagram, neutron powder diffraction was carried out. Both, nuclear and magnetic structures are studied as a function of temperature and Cr content. These results reveal the presence of more than one magnetic phase and a clear change of the spin orientation with temperature and Cr content. The mixture of magnetization and neutron powder diffraction data allow us to describe the role of the Cr3+ on the magnetic properties. (c) 2006 Elsevier B.V. All rights reserved.
机译：报告了对LaMn1-x，CrxO3.00钙钛矿（x = 0.05和0.15）的核和磁结构的比较研究。 Cr3 +与Mn4 +（3d（3））等电子，并且也是非Jahn-Teller离子。两种磁性离子均会增加空穴（空e（g）浓度）的浓度并降低Jahn-Teller畸变。为了表征Mn3 +和Cr3 +之间建立的相互作用以及Cr3 +对磁性结构的影响，合成了不含Mn4 +的样品。室温下的X射线粉末衍射揭示了所有研究样品的正交相对称（Pnma）单相材料的存在。磁数据表明，FM相互作用随Cr含量的增加而增加。磁相通过类自旋玻璃相从A型反铁磁阶跃变为具有磁簇的系统。为了充分理解磁相图，进行了中子粉末衍射。核结构和磁结构都作为温度和Cr含量的函数进行研究。这些结果表明存在一种以上的磁相，并且自旋取向随温度和Cr含量的变化明显。磁化和中子粉末衍射数据的混合物使我们能够描述Cr3 +对磁性的作用。 （c）2006 Elsevier B.V.保留所有权利。

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