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Title: Observation of two collapsed phases in CaRbF e 4 A s 4

Abstract

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.

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [3];  [4]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Maryland, College Park, MD (United States). Dept. of Physics, Center for Nanophysics and Advanced Materials
  3. 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)
  4. Univ. of Alabama, Birmingham, AL (United States). Dept. of Physics
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1568003
Alternate Identifier(s):
OSTI ID: 1545946
Report Number(s):
LLNL-JRNL-766982
Journal ID: ISSN 2469-9950; PRBMDO; 956760
Grant/Contract Number:  
AC52-07NA27344; AC52- 07NA27344; AC02-06CH11357; NA0003916; DE‐SC0014664
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 4; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Stillwell, R. L., Weir, S. T., Jeffries, J R, Wang, X., Wang, L., Campbell, D. J., Paglione, J. P., and Vohra, Y K. Observation of two collapsed phases in CaRbFe4As4. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.045152.
Stillwell, R. L., Weir, S. T., Jeffries, J R, Wang, X., Wang, L., Campbell, D. J., Paglione, J. P., & Vohra, Y K. Observation of two collapsed phases in CaRbFe4As4. United States. doi:10.1103/PhysRevB.100.045152.
Stillwell, R. L., Weir, S. T., Jeffries, J R, Wang, X., Wang, L., Campbell, D. J., Paglione, J. P., and Vohra, Y K. Wed . "Observation of two collapsed phases in CaRbFe4As4". United States. doi:10.1103/PhysRevB.100.045152. https://www.osti.gov/servlets/purl/1568003.
@article{osti_1568003,
title = {Observation of two collapsed phases in CaRbFe4As4},
author = {Stillwell, R. L. and Weir, S. T. and Jeffries, J R and Wang, X. and Wang, L. and Campbell, D. J. and Paglione, J. P. and Vohra, Y K},
abstractNote = {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.},
doi = {10.1103/PhysRevB.100.045152},
journal = {Physical Review B},
number = 4,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}

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