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

Journal Article · · Physical Review B
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
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In this paper, the pressure dependence of the magnetic and superconducting transitions and that of the superconducting upper critical field are reported for $$\mathrm{CaK}{({\mathrm{Fe}}_{1{-}x}{\mathrm{Ni}}_{x})}_{4}{\mathrm{As}}_{4}$$, 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 $${T}_{\mathrm{N}}$$ are suppressed upon applying pressure; the superconducting transition temperatures $${T}_{\mathrm{c}}$$ are suppressed by pressure as well, except for $x=0.050$ in the pressure region where $${T}_{\mathrm{N}}$$ and $${T}_{\mathrm{c}}$$ cross. Furthermore, the pressure associated with the crossing of the $${T}_{\mathrm{N}}$$ and $${T}_{\mathrm{c}}$$ 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. In conclusion, at $$p{\sim}4$$ GPa, both Ni-substituted $$\mathrm{CaK}{({\mathrm{Fe}}_{1{-}x}{\mathrm{Ni}}_{x})}_{4}{\mathrm{As}}_{4}$$ samples likely go through a half-collapsed-tetragonal phase transition, similar to the parent compound $${\mathrm{CaKFe}}_{4}{\mathrm{As}}_{4}$$.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States); Ames Lab. and Iowa State Univ., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); W. M. Keck Foundation (United States); Gordon and Betty Moore Foundation (United States)
Grant/Contract Number:
AC02-07CH11358; GBMF4411
OSTI ID:
1441000
Alternate ID(s):
OSTI ID: 1438258; OSTI ID: 1438274
Report Number(s):
IS-J-9681; PRBMDO; TRN: US1900861
Journal Information:
Physical Review B, Vol. 97, Issue 17; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Figures / Tables (11)

FIG. 1(p. 2)figure FIG. 1
FIG. 2(p. 3)figure FIG. 2
FIG. 3(p. 3)figure FIG. 3
FIG. 4(p. 4)figure FIG. 4
FIG. 5(p. 4)figure FIG. 5
FIG. 6(p. 5)figure FIG. 6
FIG. 7(p. 5)figure FIG. 7
FIG. 8(p. 5)figure FIG. 8
FIG. 9(p. 6)figure FIG. 9
FIG. 10(p. 7)figure FIG. 10
FIG. 11(p. 7)figure FIG. 11

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