Theoretical study of anisotropy in orbital and antiferromagnetic spin orderings in CMR manganites

Q4 Chemistry

International Journal of Nano and Biomaterials Pub Date : 2019-01-31 DOI:10.1504/IJNBM.2019.10018701

S. Panda, D. Sahoo, G. C. Rout

引用次数: 0

Abstract

We report here a tight binding model for doped rare earth manganites consisting of Kubo-Ohata type double exchange (DE) interaction between the eg and t2g band electron spins of same site. A Heisenberg type antiferromagnetic spin-spin interaction is considered among the core band electrons. Both nearest and next nearest neighbouring interactions are taken in the Heisenberg coupling and kinetic energy interaction. The presence of DE interaction induces antiferromagnetism (AFM) in eg band. The Jahn-Teller (JT) distortion leads to anisotropy in the manganite systems. We have considered JT distortion as an extra mechanism. The model Hamiltonian is solved using Zubarev's Green's function technique. The interplay between temperature dependent lattice strain and transverse spin fluctuations is studied. We have studied the in-plane anisotropy observed in the AFM spin fluctuation and its effect on the lattice strain.

查看原文本刊更多论文

CMR锰矿中轨道各向异性和反铁磁自旋有序的理论研究

我们在这里报道了一个由Kubo Ohata型双交换（DE）相互作用组成的掺杂稀土锰酸盐的紧密结合模型，该相互作用在相同位置的eg和t2g带电子自旋之间。考虑了核带电子之间的海森堡型反铁磁自旋-自旋相互作用。在海森堡耦合和动能相互作用中，最近和次近邻相互作用都被考虑在内。DE相互作用的存在在eg带中诱导了反铁磁性（AFM）。Jahn-Teller（JT）畸变导致了锰系的各向异性。我们认为JT失真是一种额外的机制。利用Zubarev的Green函数技术求解了模型的哈密顿量。研究了与温度相关的晶格应变与横向自旋涨落之间的相互作用。我们研究了在AFM自旋涨落中观察到的面内各向异性及其对晶格应变的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

International Journal of Nano and Biomaterials Chemistry-Physical and Theoretical Chemistry

CiteScore

1.20

自引率

0.00%

发文量

期刊介绍： In recent years, frontiers of research in engineering, science and technology have been driven by developments in nanomaterials, encompassing a diverse range of disciplines such as materials science, biomedical engineering, nanomedicine and biology, manufacturing technology, biotechnology, nanotechnology, and nanoelectronics. IJNBM provides an interdisciplinary vehicle covering these fields. Advanced materials inspired by biological systems and processes are likely to influence the development of novel technologies for a wide variety of applications from vaccines to artificial tissues and organs to quantum computers. Topics covered include Nanostructured materials/surfaces/interfaces Synthesis of nanostructures Biological/biomedical materials Artificial organs/tissues Tissue engineering Bioengineering materials Medical devices Functional/structural nanomaterials Carbon-based materials Nanomaterials characterisation Novel applications of nanomaterials Modelling of behaviour of nanomaterials Nanomaterials for biomedical applications Biological response to nanomaterials.