Superconducting and magnetic phase diagram of RbEuFe4As4 and CsEuFe4As4 at high pressure

Jackson, Daniel E.; VanGennep, Derrick; Bi, Wenli; Zhang, Dongzhou; Materne, Philipp; Liu, Yi; Cao, Guang -Han; Weir, Samuel T.; Vohra, Yogesh K.; Hamlin, James J.

doi:10.1103/PhysRevB.98.014518

Title: Superconducting and magnetic phase diagram of ${RbEuFe}_{4} {As}_{4}$ and ${CsEuFe}_{4} {As}_{4}$ at high pressure

Journal Article · 25 July 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.98.014518 · OSTI ID:1471592

Jackson, Daniel E. ^[1]; VanGennep, Derrick ^[1]; Bi, Wenli ^[2]; Zhang, Dongzhou ^[3]; Materne, Philipp ^[4]; Liu, Yi ^[5]; Cao, Guang -Han ^[5]; Weir, Samuel T. ^[6]; Vohra, Yogesh K. ^[7]; Hamlin, James J. ^[1]

Univ. of Florida, Gainesville, FL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Zhejiang Univ., Hangzhou (China)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Alabama at Birmingham, Birmingham, AL (United States)

The recently discovered (Rb,Cs)EuFe₄As₄ compounds exhibit an unusual combination of superconductivity (T_c~35K) and ferromagnetism (T_m~15K). We have performed a series of x-ray diffraction, ac magnetic susceptibility, dc magnetization, and electrical resistivity measurements on both RbEuFe₄As₄ and CsEuFe₄As₄ to pressures as high as ~30GPa. We find that the superconductivity onset is suppressed monotonically by pressure while the magnetic transition is enhanced at initial rates of dT_m/dP~1.7K/GPa and 1.5K/GPa for RbEuFe₄As₄ and CsEuFe₄As₄, respectively. Near 7 GPa, T_c onset and T_m become comparable. At higher pressures, signatures of bulk superconductivity gradually disappear. Room-temperature x-ray diffraction measurements suggest the onset of a transition from tetragonal (T) to a half-collapsed-tetragonal (hcT) phase at ~10GPa (RbEuFe₄As₄) and ~12GPa (CsEuFe₄As₄). In conclusion, the ability to tune T_c and T_m into coincidence with relatively modest pressures highlights (Rb,Cs)EuFe₄As₄ compounds as ideal systems to study the interplay of superconductivity and ferromagnetism.

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

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); German Research Foundation (DFG); National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1471592

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Superconducting and magnetic phase diagram of ${RbEuFe}_{4} {As}_{4}$ and ${CsEuFe}_{4} {As}_{4}$ at high pressure