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首页> 外文期刊>Physical Review X >Dynamic Spin-Lattice Coupling and Nematic Fluctuations in NaFeAs
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Dynamic Spin-Lattice Coupling and Nematic Fluctuations in NaFeAs

机译:nafeas中的动态旋转晶格耦合和向征集波动

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We use inelastic neutron scattering to study acoustic phonons and spin excitations in single crystals of NaFeAs, a parent compound of iron-pnictide superconductors. NaFeAs exhibits a tetragonal-to-orthorhombic structural transition at T s ≈ 58 K and a collinear antiferromagnetic order at T N ≈ 45 K . While longitudinal and out-of-plane transverse acoustic phonons behave as expected, the in-plane transverse acoustic phonons reveal considerable softening on cooling to T s and then harden on approaching T N before saturating below T N . In addition, we find that spin-spin correlation lengths of low-energy magnetic excitations within the FeAs layer and along the c axis increase dramatically below T s and show a weak anomaly across T N . These results suggest that the electronic nematic phase present in the paramagnetic tetragonal phase is closely associated with dynamic spin-lattice coupling, possibly arising from the one-phonon–two-magnon mechanism.
机译:我们使用非弹性中子散射研究声子宫和旋转激发在NafeS中的单晶体中,是铁毒剂超导体的母体化合物。 Nafeas在Ts≈58k和tn≈5k的基团反铁磁性阶的四边形致正极结构转变。虽然纵向和平面外横向声学声子表现得如预期,在平面内横向声子宫内显示器在冷却至T s上显示相当大的软化,然后在饱和下饱和N n之前的T N硬化。此外,我们发现既有魅力层内的低能量磁激发的旋转旋转相关长度,沿着C轴急剧增加到下面,并显示弱异常。这些结果表明,该顺磁四方相中存在的电子向量与动态旋转晶格耦合密切相关,可能由单声道 - 双氧化锰机构产生。

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