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
复制标题
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
影响因子:
3.7
通讯作者:
Chu, Jiun-Haw
中科院分区:
文献类型:
--
作者:
Sanchez, Joshua Javier;Malinowski, Paul;Kim, Jong-Woo;Ryan, Philip;Chu, Jiun-Haw
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.
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