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

Sanchez, Joshua Javier; Malinowski, Paul; Kim, Jong-Woo; Ryan, Philip; Chu, Jiun-Haw

doi:10.1103/physrevb.105.064513

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

Journal Article · 22 February 2022 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.105.064513 · OSTI ID:1879101

^[1]; Malinowski, Paul ^[1]; Kim, Jong-Woo ^[2]; Ryan, Philip ^[3]; Chu, Jiun-Haw ^[1]

Univ. of Washington, Seattle, WA (United States)
Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)
Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS); Dublin City University (Ireland)

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 in Ba(Fe_1-xCox)₂As₂ using 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. We report 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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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); David and Lucile Packard Foundation; Alfred P. Sloan Foundation; State of Washington; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS)

Grant/Contract Number:: AC02-06CH11357; SC0014664

OSTI ID:: 1879101

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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