Competition between orthorhombic and re-entrant tetragonal phases in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ probed by the response to controlled disorder

Abstract

Low-temperature (22~K) irradiation with 2.5~MeV electrons was used to study the competition between stripe ${\mathrm{C}}_2$ and tetragonal ${\mathrm{C}}_4$ antiferromagnetic phases which exist in a narrow doping range around $x=$0.25 in hole-doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$. In nearby compositions outside of this range, at $x=$0.22 and $x=$0.19, the temperatures of both the concomitant orthorhombic/stripe antiferromagnetic transition $T_{C2}$ and the superconducting transition $T_{\mathrm{c}}$ are monotonically suppressed by added disorder at similar rates of about 0.1~K/$\mu \Omega$cm, as revealed through using resistivity variation as an intrinsic measure of scattering rate. In a stark contrast, a rapid suppression of the ${\mathrm{C}}_4$ phase at the rate of 0.24 K/$\mu \Omega \cdot$cm is found at $x=$0.25. Moreover, this suppression of the ${\mathrm{C}}_4$ phase is accompanied by unusual disorder-induced stabilization of the ${\mathrm{C}}_2$ phase, determined by resistivity and specific heat measurements. The rate of the ${\mathrm{C}}_4$ phase suppression is notably higher than the suppression rate of the spin-vortex phase in the Ni-doped CaKFe${}_4$As${}_4$ (0.16 K/$\mu \Omega$cm).

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Cited by in corpus (6)

• Short-range nematic fluctuations in Sr1-xNaxFe2As2 superconductors
• Disorder-Induced Electronic Nematicity
• Incommensurate magnetic states induced by ordering competition in $\mathrm{B}{\mathrm{a}}_{1-\mathrm{x}}\mathrm{N}{\mathrm{a}}_{\mathrm{x}}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• Enhancement of the Curie temperature in single crystalline ferromagnetic LaCrGe${}_3$ by electron irradiation-induced disorder
• Interplay of stripe and double-Q magnetism with superconductivity in ${\mathrm{Ba}}_{1-x}{\mathrm{K}}_x{\mathrm{Fe}}_2{\mathrm{As}}_2$ under the influence of magnetic fields
• Effect of controlled point-like disorder induced by 2.5 MeV electron irradiation on nematic resistivity anisotropy of hole-doped (Ba,K)Fe${}_2$As${}_2$