Combined external pressure and Cu-substitution studies on BaFe₂As₂ single crystals

Journal of Physics. Condensed Matter : an Institute of Physics Journal
M M PivaP G Pagliuso

Abstract

We report a combined study of external pressure and Cu-substitution on BaFe2As2 single crystals grown by the in-flux technique. At ambient pressure, the Cu-substitution is known to suppress the spin density wave (SDW) phase in pure BaFe2As2(T(SDW) ≈ 140 K) and to induce a superconducting (SC) dome with a maximum transition temperature T(c)(max) ≃ 4.2 K. This T(c)(max) is much lower than the T(c) ∼ 15-28 K achieved in the case of Ru, Ni and Co substitutions. Such a lower T(c) is attributed to a Cu(2+) magnetic pair-breaking effect. The latter is strongly suppressed by applied pressure, as shown herein, Tc can be significantly enhanced by applying high pressures. In this work, we investigated the pressure effects on Cu(2+) magnetic pair-breaking in the BaFe(2-x)Cu(x)As2 series. Around the optimal concentration (x(opd) = 0.11), all samples showed a substantial increase of T(c) as a function of pressure. Yet for those samples with a slightly higher doping level (over-doped regime), T(c) presented a dome-like shape with maximum T(c) ≃ 8 K. Remarkably interesting, the under-doped samples, e.g. x = 0.02 display a maximum pressure induced T(c) ≃ 30 K which is comparable to the maximum T(c)'s found for the pure compound under external p...Continue Reading

References

Feb 26, 2008·Journal of the American Chemical Society·Yoichi KamiharaHideo Hosono
Nov 13, 2009·Physical Review Letters·Seiichiro Onari, Hiroshi Kontani
Sep 28, 2010·Physical Review Letters·R R UrbanoP G Pagliuso
Sep 28, 2010·Physical Review Letters·S M RamosJ D Thompson
Apr 27, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·J A McLeodA Moewes

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Citations

Jul 10, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·U F KanekoE Granado

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