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Magnetoelastic effects in iron telluride

机译:碲化铁中的磁弹性效应

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Iron telluride doped lightly with selenium is known to undergo a first-order magnetostructural transition before becoming superconducting at higher doping. We study the effects of magnetoelastic couplings on this transition using symmetry considerations. We find that the magnetic order parameters are coupled to the uniform monoclinic strain of the unit cell with one iron per cell, as well as to the phonons at high-symmetry points of the Brillouin zone. In the magnetic phase the former gives rise to monoclinic distortion while the latter induces dimerization of the ferromagnetic iron chains due to alternate lengthening and shortening of the nearest-neighbor iron-iron bonds. We compare this system with the iron arsenides and propose a microscopic magnetoelastic Hamiltonian which is relevant for all the iron-based superconductors. We argue that this describes electron-lattice coupling in a system where electron-electron interaction is crucial.
机译:众所周知,轻掺杂硒的碲化铁会先经历一阶磁结构转变,然后在更高的掺杂下变得超导。我们使用对称性考虑因素研究了磁弹性耦合对该过渡的影响。我们发现,磁阶参数耦合到每个单元具有一个铁的晶胞的均匀单斜应变,以及布里渊区高对称点的声子。在磁性相中,前者引起单斜晶畸变,而后者则引起铁磁性铁链的二聚化,这是由于最近邻的铁-铁键交替加长和缩短。我们将该系统与砷化铁进行了比较,并提出了一种微观磁弹性哈密顿量,它与所有铁基超导体有关。我们认为,这描述了在电子与电子相互作用至关重要的系统中的电子-晶格耦合。

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