FeSe 超导体中向列波动的证据:57Fe 莫斯鲍尔光谱研究。

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER
Shixin Hu, Jijun Xue, Xiaoying Wang, Hua Pang
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引用次数: 0

摘要

关于 FeSe 超导体中向列有序的驱动力一直存在争议。在此,我们详细研究了 FeSe 单晶粉末的 57Fe 莫斯鲍尔光谱,重点是向列转变温度 Ts ~ 90 K 附近超线性参数的温度依赖性。从无再消散分数和二阶多普勒频移推导出的晶格动力学温度演化,发现先后经历了声子软化(160 K - 105 K)和声子硬化(105 K - 90 K)两个阶段,这与 Ts 以上局部正交畸变的出现和相关向列关联的建立有关。对线宽的分析表明,自旋波动不仅发生在 70 K 以下,而且跨越 Ts(105 K-70 K),并伴随着电子的非费米液体行为。结果表明,在 Ts 附近,晶格、自旋和电子自由度之间存在强烈的相互作用,晶格自由度可能在驱动 FeSe 的向列有序中发挥了重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evidence for nematic fluctuations in FeSe superconductor: a57Fe Mössbauer spectroscopy study.

There has been controversy about the driving force of the nematic order in the FeSe superconductor. Here, we present a detailed study of the57Fe Mössbauer spectra of FeSe single-crystal powders, focusing on the temperature dependences of the hyperfine parameters in the vicinity of the nematic transition temperature,Ts∼ 90 K. The nematicity-induced splitting ofdxzanddyzbands, obtained from the anomalous increase in quadrupole splitting nearTs, starts at 143 K. The temperature evolution of the lattice dynamics, deduced from the recoilless fractions and second-order Doppler shifts, is found to undergo successively two segments of phonon-softening (160 K-105 K) and phonon-hardening (105 K-90 K), related to the appearance of local orthorhombic distortions aboveTsand the establishing way of the associated nematic correlations. Analysis of the linewidths shows that spin fluctuations occur not only below 70 K but also acrossTs(105 K-70 K), accompanied by the non-Fermi liquid behavior of the electrons. The results demonstrate the strong interactions between lattice, spin, and electron degrees of freedom in the vicinity ofTsand that the lattice degrees of freedom may play an essential role in driving the nematic order for FeSe.

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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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