Combined effects of Sr substitution and pressure on the ground states in CaFe2As2

Knoner, S.; Gati, E.; Kohler, S.; Wolf, B.; Tutsch, U.; Ran, S.; Torikachvili, M. S.; Bud'ko, S. L.; Canfield, P. C.; Lang, M.

doi:10.1103/PhysRevB.94.144513

Title: Combined effects of Sr substitution and pressure on the ground states in ${CaFe}_{2} {As}_{2}$

Journal Article · Fri Oct 21 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.144513· OSTI ID:1335025

Knoner, S. ^[1]; Gati, E. ^[1]; Kohler, S. ^[1]; Wolf, B. ^[1]; Tutsch, U. ^[1]; Ran, S. ^[2]; Torikachvili, M. S. ^[3]; Bud'ko, S. L. ^[4]; Canfield, P. C. ^[4]; Lang, M. ^[1]

J.W. Goethe-Univ. Frankfurt(M), Frankfurt(M) (Germany)
Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of California, San Diego, CA (United States)
San Diego State Univ., San Diego, CA (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States)

Here, we present a detailed study of the combined effects of Sr substitution and hydrostatic pressure on the ground-state properties of CaFe₂As₂. Measurements of the electrical resistance and magnetic susceptibility, both at ambient and finite pressure P ≤ 2 GPa, were performed on Ca_1–xSr_xFe₂As₂ single crystals grown out of Sn flux. We find that by Sr substitution the transition temperature to the magnetic/structural phase is enhanced and therefore a higher pressure is needed to suppress the transition to lowest temperature. In addition, the transition to the collapsed tetragonal phase is found at a pressure, which is distinctly higher than in the pure compound. This implies that the stability ranges of both phases shift on the pressure-axis upon doping, but the latter one with a higher rate. These observations suggest the possibility of separating the two phase lines, which intersect already at elevated temperatures for x = 0 and low Sr concentration levels. For x = 0.177, we find strong evidence that both phases remain separated down to the lowest temperature and that a zero-resistance state emerges in this intermediate pressure window. This observation indicates that Sr substitution combined with hydrostatic pressure provides another route for stabilizing superconductivity in CaFe₂As₂. Lastly, our results are consistent with the notion that (i) preserving the fluctuations associated with the structural-magnetic transition to low temperatures is vital for superconductivity to form in this material and that (ii) the nonmagnetic collapsed tetragonal phase is detrimental for superconductivity.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1335025

Alternate ID(s):: OSTI ID: 1329508

Report Number(s):: IS-J-9130; PRBMDO

Journal Information:: Physical Review B, Vol. 94, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Evolution of the magnetic order of Fe and Eu sublattices in Eu _{1− x} Ca _x Fe ₂ As ₂ (0 ⩽ x ⩽ 1) single crystals Harnagea, Luminita; Kumar, Rohit; Singh, Surjeet Journal of Physics: Condensed Matter, Vol. 30, Issue 41 https://doi.org/10.1088/1361-648x/aadea6	journal	September 2018
Collapsed tetragonal phase as a strongly covalent and fully nonmagnetic state: Persistent magnetism with interlayer As–As bond formation in Rh-doped $Ca_{0.8}Sr_{0.2}Fe_{2}As_{2}$ Zhao, K.; Glasbrenner, J. K.; Gretarsson, H. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2019-00170	text	January 2018

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