Short-Range Nematic Fluctuations in Sr1-xNaxFe2As2 Superconductors

Wu, Shan; Song, Yu; He, Yu; Frano, Alex; Yi, Ming; Chen, Xiang; Uchiyama, Hiroshi; Alatas, Ahmet; Said, Ayman H.; Wang, Liran; Wolf, Thomas; Meingast, Christoph; Birgeneau, Robert J.

doi:10.1103/physrevlett.126.107001

Title: Short-Range Nematic Fluctuations in Sr_1-xNa_xFe₂As₂ Superconductors

Journal Article · Mon Mar 08 00:00:00 EST 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.126.107001· OSTI ID:1787865

^[1]; Song, Yu ^[2]; He, Yu ^[3]; Frano, Alex ^[4]; Yi, Ming ^[5]; Chen, Xiang ^[1];

^[6];

^[7]; Said, Ayman H. ^[7]; Wang, Liran ^[8]; Wolf, Thomas ^[8]; Meingast, Christoph ^[8]; Birgeneau, Robert J. ^[1]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Zhejiang Univ., Hangzhou (China)
Univ. of California, Berkeley, CA (United States)
Univ. of California, San Diego, CA (United States)
Rice Univ., Houston, TX (United States)
Japan Synchrotron Radiation Research Inst., Sayo (Japan)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Karlsruhe Inst. of Technology (KIT) (Germany). Inst. for Quantum Materials and Technologies

Interactions between nematic fluctuations, magnetic order and superconductivity are central to the physics of iron-based superconductors. Here we report on in-plane transverse acoustic phonons in hole-doped Sr_1-xNa_xFe₂As₂ measured via inelastic x-ray scattering, and extract both the nematic susceptibility and the nematic correlation length. By a self-contained method of analysis, for the underdoped (x = 0.36) sample, which harbors a magnetically ordered tetragonal phase, we find it hosts a short nematic correlation length ξ ~ 10Å and a large nematic susceptibility Χ_nem. The optimal-doped (x = 0.55) sample exhibits weaker phonon softening effects, indicative of both reduced xi and Χ_nem. Overall, our results suggest short-range nematic fluctuations may favor superconductivity, placing emphasis on the nematic correlation length for understanding the iron-based superconductors.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Alfred P. Sloan Foundation; Welch Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-06CH11357; AC02-05CH11231

OSTI ID:: 1787865

Alternate ID(s):: OSTI ID: 1877039

Journal Information:: Physical Review Letters, Vol. 126, Issue 10; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Short-Range Nematic Fluctuations in Sr1-xNaxFe2As2 Superconductors

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Title: Short-Range Nematic Fluctuations in Sr_1-xNa_xFe₂As₂ Superconductors