Observation of two collapsed phases in CaRbFe4As4

Stillwell, R. L.; Weir, S. T.; Jeffries, J R; Wang, X.; Wang, L.; Campbell, D. J.; Paglione, J. P.; Vohra, Y K

doi:10.1103/PhysRevB.100.045152

Observation of two collapsed phases in $CaRbF e_{4} A s_{4}$

Journal Article · Wed Jul 31 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.100.045152· OSTI ID:1568003

Stillwell, R. L. ^[1]; Weir, S. T. ^[1]; Jeffries, J R ^[1]; Wang, X. ^[2]; Wang, L. ^[2]; Campbell, D. J. ^[2]; Paglione, J. P. ^[3]; Vohra, Y K ^[4]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Maryland, College Park, MD (United States). Dept. of Physics, Center for Nanophysics and Advanced Materials
Univ. of Maryland, College Park, MD (United States). Dept. of Physics, Center for Nanophysics and Advanced Materials; Canadian Inst. for Advanced Research, Toronto, ON (Canada)
Univ. of Alabama, Birmingham, AL (United States). Dept. of Physics

We report the observation of the pressure-induced, fully collapsed tetragonal phase of $$CaRbF_{e_4}As_4$$ for $P ~ 22 GPa$ via high-pressure x-ray diffraction and magnetotransport measurements. The x-ray measurements, along with resistivity measurements, show that there is an initial half-collapsed tetragonal phase for $6 < P < 22$ GPa , in which superconductivity is continuously suppressed from $$T_ c = 35 K$$ at $P = 3.1 GP$a to $$T_c < 2 K$$ for $P ≥ 17.2 GPa$ , as well as signs of the fully collapsed tetragonal phase near $P = 22 GPa$. Density functional calculations suggest that both of these transitions are driven by increased As-As bonding, first across the Ca layer, and then at the second transition, across the Rb layer. Although electrical resistivity measurements in the fully collapsed tetragonal phase do not show superconductivity, there is a change in the slope of both the Hall coefficient and the longitudinal resistance near 22 GPa, suggesting a strong correlation between the electronic and lattice degrees of freedom in this new iron-based superconductor.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-06CH11357; AC52-07NA27344; NA0003916; SC0014664

OSTI ID:: 1568003

Alternate ID(s):: OSTI ID: 1545946

Report Number(s):: LLNL-JRNL-766982; 956760

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 4 Vol. 100; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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