Pressure effect on magnetism and valence in ferromagnetic superconductor Eu(Fe0.75Ru0.25)2As2

Nix, Zachary; Zhao, Jiyong; Alp, Esen E.; Xiao, Yuming; Zhang, Dongzhou; Cao, Guang-Han; Vohra, Yogesh K.; Bi, Wenli

doi:10.1088/1361-648x/ac84bb

Title: Pressure effect on magnetism and valence in ferromagnetic superconductor Eu(Fe_0.75Ru_0.25)₂As₂

Journal Article · 04 August 2022 · Journal of Physics. Condensed Matter

DOI: https://doi.org/10.1088/1361-648x/ac84bb · OSTI ID:1902348

Nix, Zachary ^[1]; Zhao, Jiyong ^[2]; Alp, Esen E. ^[2]; Xiao, Yuming ^[2]; Zhang, Dongzhou ^[3];

^[4];

^[1];

^[1]

Univ. of Alabama, Birmingham, AL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Zhejiang Univ., Hangzhou (China)

Eu(Fe_0.75Ru_0.25)₂As₂ is an intriguing system with unusual coexistence of superconductivity and ferromagnetism, providing a unique platform to study the nature of such coexistence. To establish a magnetic phase diagram, time-domain synchrotron Mössbauer experiments in ¹⁵¹Eu have been performed on a single crystalline Eu(Fe_0.75Ru_0.25)₂As₂ sample under hydrostatic pressures and at low temperatures. Upon compression the magnetic ordering temperature increases sharply from 20 K at ambient pressure, reaching ~49 K at 10.1GPa. With further compression, the magnetic order is suppressed and eventually collapses. Isomer shift values from Mössbauer measurements and x-ray absorption spectroscopy data at Eu L₃ edge show that pressure drives Eu ions to a homogeneous intermediate valence state with mean valence of ~2.4 at 27.4 GPa, possibly responsible for the suppression of magnetism. Synchrotron powder x-ray diffraction experiment reveals a tetragonal to collapsed-tetragonal structural transition around 5 GPa, a lower transition pressure than in the parent compound. Furthermore, these results provide guidance to further work investigating the interplay of superconductivity and magnetism.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Consortium for Materials Properties Research in Earth Sciences (COMPRES); Department of Education, Graduate Assistantship in Areas of National Need (GAANN); National Key Research and Development Program of China; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1902348

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 41 Vol. 34; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Pressure effect on magnetism and valence in ferromagnetic superconductor Eu(Fe0.75Ru0.25)2As2

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Title: Pressure effect on magnetism and valence in ferromagnetic superconductor Eu(Fe_0.75Ru_0.25)₂As₂