Quantitative relationship between structural orthorhombicity, shear modulus, and heat capacity anomaly of the nematic transition in iron-based superconductors

Quantitative relationship between structural orthorhombicity, shear modulus, and heat capacity anomaly of the nematic transition in iron-based superconductors
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铁基超导体结构正交性、剪切模量和向列相转变热容异常之间的定​​量关系

DOI:
10.1103/physrevb.105.064513
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发表时间:
2022
期刊:
影响因子:
3.7
通讯作者:
Chu, Jiun-Haw
Chu, Jiun-Haw
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Sanchez, Joshua Javier;Malinowski, Paul;Kim, Jong-Woo;Ryan, Philip;Chu, Jiun-Haw

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镍铁材料中的电子向列性已经通过各种实验技术得到了广泛的研究,但其相变时的热容异常尚未得到定量的研究。在本文中,我们回顾了用朗道自由能来描述向列性的热力学描述,它定义了三个热力学量的行为:在向列转变以下发展的结构正交性,转变以上的软化剪切模量和转变处的不连续热容。我们推导了这三个量之间的定量关系,发现它适用于一系列兴奋剂。结果表明,在相图的欠掺杂区,向列跃迁可以用平均场模型很好地描述。
Electronic nematicity in iron pnictide materials has been extensively studied by various experimental techniques, yet its heat capacity anomaly at the phase transition has not been examined quantitatively. In this paper, we review the thermodynamic description of nematicity inusing the Landau free energy, which defines the behavior of three thermodynamic quantities: the structural orthorhombicity that develops below the nematic transition, the softening shear modulus above the transition, and the discontinuous heat capacity at the transition. We derive a quantitative relationship between these three quantities, which is found to hold for a range of dopings. This result shows that the nematic transition is exceedingly well described by a mean-field model in the underdoped regime of the phase diagram.
DOI: 10.1073/pnas.2105911118
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