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Title: Pressure-temperature phase diagrams of CaK ( Fe 1 x Ni x ) 4 As 4 superconductors

Abstract

Here, the pressure dependence of the magnetic and superconducting transitions and that of the superconducting upper critical field are reported for CaK(Fe 1–xNi x) 4As 4, the first example of an Fe-based superconductor with spin-vortex-crystal-type magnetic ordering. Resistance measurements were performed on single crystals with two substitution levels (x = 0.033,0.050) under hydrostatic pressures up to 5.12 GPa and in magnetic fields up to 9 T. Our results show that, for both compositions, magnetic transition temperatures T N are suppressed upon applying pressure; the superconducting transition temperatures T c are suppressed by pressure as well, except for x = 0.050 in the pressure region where T N and T c cross. Furthermore, the pressure associated with the crossing of the T N and T c lines also coincides with a minimum in the normalized slope of the superconducting upper critical field, consistent with a likely Fermi-surface reconstruction associated with the loss of magnetic ordering. Lastly, at p ~ 4 GPa, both Ni-substituted CaK(Fe 1–xNi x) 4As 4 samples likely go through a half-collapsed-tetragonal phase transition, similar to the parent compound CaKFe 4As 4.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States); Ames Lab. and Iowa State Univ., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); W. M. Keck Foundation (United States); Gordon and Betty Moore Foundation (United States)
OSTI Identifier:
1441000
Alternate Identifier(s):
OSTI ID: 1438258; OSTI ID: 1438274
Report Number(s):
IS-J-9681
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1900861
Grant/Contract Number:  
AC02-07CH11358; GBMF4411
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 17; 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; magnetism; phase diagrams; pressure effects; superconductivity; 4-terminal techniques

Citation Formats

Xiang, Li, Meier, William R., Xu, Mingyu, Kaluarachchi, Udhara S., Bud'ko, Sergey L., and Canfield, Paul C. Pressure-temperature phase diagrams of CaK(Fe1–xNix)4As4 superconductors. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.174517.
Xiang, Li, Meier, William R., Xu, Mingyu, Kaluarachchi, Udhara S., Bud'ko, Sergey L., & Canfield, Paul C. Pressure-temperature phase diagrams of CaK(Fe1–xNix)4As4 superconductors. United States. doi:10.1103/PhysRevB.97.174517.
Xiang, Li, Meier, William R., Xu, Mingyu, Kaluarachchi, Udhara S., Bud'ko, Sergey L., and Canfield, Paul C. Tue . "Pressure-temperature phase diagrams of CaK(Fe1–xNix)4As4 superconductors". United States. doi:10.1103/PhysRevB.97.174517. https://www.osti.gov/servlets/purl/1441000.
@article{osti_1441000,
title = {Pressure-temperature phase diagrams of CaK(Fe1–xNix)4As4 superconductors},
author = {Xiang, Li and Meier, William R. and Xu, Mingyu and Kaluarachchi, Udhara S. and Bud'ko, Sergey L. and Canfield, Paul C.},
abstractNote = {Here, the pressure dependence of the magnetic and superconducting transitions and that of the superconducting upper critical field are reported for CaK(Fe1–xNix)4As4, the first example of an Fe-based superconductor with spin-vortex-crystal-type magnetic ordering. Resistance measurements were performed on single crystals with two substitution levels (x = 0.033,0.050) under hydrostatic pressures up to 5.12 GPa and in magnetic fields up to 9 T. Our results show that, for both compositions, magnetic transition temperatures TN are suppressed upon applying pressure; the superconducting transition temperatures Tc are suppressed by pressure as well, except for x = 0.050 in the pressure region where TN and Tc cross. Furthermore, the pressure associated with the crossing of the TN and Tc lines also coincides with a minimum in the normalized slope of the superconducting upper critical field, consistent with a likely Fermi-surface reconstruction associated with the loss of magnetic ordering. Lastly, at p ~ 4 GPa, both Ni-substituted CaK(Fe1–xNix)4As4 samples likely go through a half-collapsed-tetragonal phase transition, similar to the parent compound CaKFe4As4.},
doi = {10.1103/PhysRevB.97.174517},
journal = {Physical Review B},
number = 17,
volume = 97,
place = {United States},
year = {2018},
month = {5}
}

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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Evolution of the in-plane resistance with hydrostatic pressures up to 1.83 GPa measured in a PCC for the CaK(Fe0:967Ni0.033)4As4, sample#1. (b) Blowup of the low temperature region. Criteria for T$onset\atop{c}$ and T$offset\atop{c}$ are indicated in the figure. (c) Temperature derivative, dR/dT, showing the evolution of the magneticmore » transition TN with offset criteria as shown in the figure.« less

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