Lattice dynamics of ultrathin FeSe films on SrTiO3

Zhang, Shuyuan; Guan, Jiaqi; Wang, Yan; Berlijn, Tom; Johnston, Steve; Jia, Xun; Liu, Bing; Zhu, Qing; An, Qichang; Xue, Siwei; Cao, Yanwei; Yang, Fang; Wang, Weihua; Zhang, Jiandi; Plummer, E. W.; Zhu, Xuetao; Guo, Jiandong

doi:10.1103/PhysRevB.97.035408

Title: Lattice dynamics of ultrathin FeSe films on ${SrTiO}_{3}$

Journal Article · Mon Jan 08 00:00:00 EST 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.035408· OSTI ID:1484097

Zhang, Shuyuan ^[1]; Guan, Jiaqi ^[1]; Wang, Yan ^[2]; Berlijn, Tom ^[3]; Johnston, Steve ^[2]; Jia, Xun ^[1]; Liu, Bing ^[1]; Zhu, Qing ^[1]; An, Qichang ^[1]; Xue, Siwei ^[1]; Cao, Yanwei ^[4]; Yang, Fang ^[4]; Wang, Weihua ^[4]; Zhang, Jiandi ^[5]; Plummer, E. W. ^[5]; Zhu, Xuetao ^[1]; Guo, Jiandong ^[6]

Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics; Univ. of Chinese Academy of Sciences, Beijing (China). School of Physical Sciences
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences. Computational Sciences and Engineering Division
Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics
Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics; Univ. of Chinese Academy of Sciences, Beijing (China). School of Physical Sciences; Collaborative Innovation Center of Quantum Matter, Beijing (China)

Charge transfer and electron-phonon coupling (EPC) are proposed to be two important constituents associated with enhanced superconductivity in the single unit cell FeSe films on oxide surfaces. Using high-resolution electron energy loss spectroscopy combined with first-principles calculations, we have explored here the lattice dynamics of ultrathin FeSe films grown on $${\mathrm{SrTiO}}_{3}$$. We show that, despite the significant effect from the substrate on the electronic structure and superconductivity of the system, the FeSe phonons in the films are unaffected. The energy dispersion and linewidth associated with the Fe- and Se-derived vibrational modes are thickness and temperature independent. Theoretical calculations indicate the crucial role of antiferromagnetic correlation in FeSe to reproduce the experimental phonon dispersion. Importantly, the only detectable change due to the growth of FeSe films is the broadening of the Fuchs-Kliewer (F-K) phonons associated with the lattice vibrations of $${\mathrm{SrTiO}}_{3}$$(001) substrate. Finally, if EPC plays any role in the enhancement of film superconductivity, it must be the interfacial coupling between the electrons in FeSe film and the F-K phonons from substrate rather than the phonons of FeSe.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Louisiana State Univ., Baton Rouge, LA (United States); Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; Youth Innovation Promotion Association of Chinese Academy of Sciences (CAS)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231; DMR 1608865; 11634016; 2017YFA0303600

OSTI ID:: 1484097

Alternate ID(s):: OSTI ID: 1416071

Journal Information:: Physical Review B, Vol. 97, Issue 3; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Title: Lattice dynamics of ultrathin FeSe films on SrTiO 3

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