Influence of Sr doping on the structural and magnetic properties of (Y,Gd)Ba1−xSrxCuFeO5 (x=0,0.25,0.5) studied by FTIR and 57Fe Mössbauer spectroscopy
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引用次数: 0
Abstract
The effect of replacing Y by Gd and Ba by Sr is studied by Fourier Transform Infrared spectroscopy, 57Fe Mössbauer spectroscopy and DC susceptibility measurements. Site disorder is inferred from FTIR and Mössbauer spectra using a Maximum-Entropy-Method. A doping dependence of the IR peaks and the hyperfine parameters is explained in terms of bonding energies and electric field gradient variations in the crystal lattice caused by Fe/Cu site disorder. We find an influence of doping on the structural and magnetic properties through a correlation of hyperfine parameters such as the electric quadrupole splitting and the magnetic hyperfine field. We also find that a paramagnetic volume fraction appears for GdBaCuFeO that increases upon Sr doping at the Ba site. The different behavior of the susceptibility upon replacing Y by Gd is attributed to the lack of a favorable environment to enable a Gd-Fe or Gd-Cu exchange interaction.
通过傅立叶变换红外光谱和 57Fe 莫斯鲍尔光谱研究掺杂 Sr 对 (Y,Gd)Ba1-xSrxCuFeO5 (x=0,0.25,0.5) 结构和磁性能的影响
通过傅立叶变换红外光谱、57Fe 莫斯鲍尔光谱和直流电感测量，研究了用 Gd 替代 Y 和用 Sr 替代 Ba 的影响。利用最大熵法从傅立叶变换红外光谱和莫斯鲍尔光谱推断出了位点紊乱。红外峰和超频参数的掺杂依赖性是通过铁/铜位点紊乱引起的晶格中的成键能和电场梯度变化来解释的。我们发现掺杂对结构和磁特性的影响是通过电四极分裂和磁超线性场等超线性参数的相关性来实现的。我们还发现，GdBaCuFeO5 出现了顺磁体积分数，当在 Ba 位点掺杂 Sr 时，顺磁体积分数会增加。用 Gd 替代 Y 时，电感的不同表现归因于缺乏有利的环境来实现 Gd-Fe 或 Gd-Cu 交换相互作用。
期刊介绍：
Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work.
Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas:
-Magnetism
-Materials physics
-Nanostructures and nanomaterials
-Optics and optical materials
-Quantum materials
-Semiconductors
-Strongly correlated systems
-Superconductivity
-Surfaces and interfaces
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