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# A neutron scattering study of the under-doped Ba$$_{1-x}$$K$$_{x}$$Fe$$_{2}$$As$$_{2}$$, x=0.09 and 0.17 self-flux grown single crystals and the universality of the tricritical point

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### Abstract

We present a combination of elastic neutron scattering measurements in zero and 14.5 T and magnetization measurements in zero and 14 T on under-doped superconducting Ba$$_{1-x}$$K$$_{x}$$Fe$$_{2}$$As$$_{2}$$ x=0.17, and the same measurements in zero field on a non-superconducting crystal with x=0.09. The data suggest that the under-doped materials may not be electronic phase separated but rather have slightly inhomogeneous potassium doping. The temperature dependence of the magnetic order parameter (OP) below the transition of the sample with x=0.09 is more gradual than that for the case of the un-doped BaFe$$_{2}$$As$$_{2}$$, suggesting that this doping may be in the vicinity of a tricritical point. We advance therefore the hypothesis that the tricritical point is a common feature of all superconducting 122s. For the x=0.17 sample, while T$$_{c}$$ is suppressed from $$\approx$$17 K to $$\approx$$8 K by a magnetic field of 14 T, the intensity of the magnetic Bragg peaks (1 0 3) at 1.2 K is enhanced by 10$$%$$ showing competition of superconductivity (SC) and antiferromagnetism (AFM). The intensity of the magnetic Bragg peaks (1 0 3) in the (T$$_{c}$$, T$$_{N}$$) temperature interval remain practically unchanged in 14.5 T within a 10$$%$$ statistical error. The present results are discussed in the context of the existing literature.

### Most cited references25

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### Superconductivity at 38 K in the Iron Arsenide$$({\mathrm{Ba}}_{1-x}{\mathrm{K}}_{x}){\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$$

(2008)
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### Superconductivity at 22 K in Co-doped BaFe2As2 Crystals

(2008)
Here we report bulk superconductivity in BaFe1.8Co0.2As2 single crystals below Tc = 22 K, as demonstrated by resistivity, magnetic susceptibility, and specific heat data. Hall data indicate that the dominant carriers are electrons, as expected from simple chemical reasoning. This is the first example of superconductivity induced by electron doping in this family of materials. In contrast to the cuprates, the BaFe2As2 system appears to tolerate considerable disorder in the FeAs planes. First principles calculations for BaFe1.8Co0.2As2 indicate the inter-band scattering due to Co is weak.
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### Evolution from non-Fermi- to Fermi-liquid transport via isovalent doping inBaFe2(As1−xPx)2superconductors

(2010)
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### Author and article information

###### Journal
1111.3329
10.1103/PhysRevB.85.144506

Condensed matter