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Strain derivative of thermoelectric properties as a sensitive probe for nematicity

机译：热电性能的应变衍生物作为对象征的敏感探针

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The nematic instability is an undebatable ingredient of the physics of iron-based superconductors. Yet, its origin remains enigmatic as it involves a fermiology with an intricate interplay of lattice-, orbital-, and spin degrees of freedom. It is well known that thermoelectric transport is an excellent probe for revealing even subtle signatures of instabilities and pertinent fluctuations. In this paper, we report a strong response of the thermoelectric transport properties of two underdoped 1111 iron-based superconductors to a vanishingly small strain. By introducing the strain derivative of the Seebeck and the Nernst coefficients, we provide a description of the nematic order parameter, proving the existence of an anisotropic Peltier-tensor beside an anisotropic conductivity tensor. Our measurements reveal that the transport nematic phenomenology is the result of the combined effect of both an anisotropic scattering time and Fermi surface distortions, pointing out that in a realistic description, abreast of the spin fluctuations also the orbital character is a fundamental ingredient. In addition, we show that nematic fluctuations universally relax in a Curie-Weiss fashion above TS in all the elasto-transport measurements and we provide evidences that nematicity must be band selective.
机译：向甲型不稳定性是铁基超导体物理的不可脱水成分。然而，它的起源仍然是神秘的，因为它涉及一种具有复杂的格子，轨道和旋转自由度的复杂相互作用的神经性。众所周知，热电传输是揭示甚至揭示不稳定性和相关波动的优异探头。在本文中，我们报告了两种底部的1111铁基超导体的热电传输性能的强烈反应，以缺乏缺陷的小菌株。通过引入Seebeck和NERNST系数的应变衍生物，我们提供了向列法参数的描述，证明存在各向异性导电张量旁边的各向异性Peltier-Tensor的存在。我们的测量表明，运输列目现象学是各向异性散射时间和费米表面畸变的综合效果的结果，指出，在现实描述中，旋转波动的时，轨道性质也是基本成分。此外，我们表明，在所有弹性传输测量中，向列法波动普遍存在TS之上的Curie-Weiss时尚，我们提供了证据，即信用性必须是带选择性的。

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