Impact of Ca substitution on competing orders in superconducting BaNi2As2
F. Henssler, K. Willa, M. Frachet, T. Lacmann, D. A. Chaney, R. Heid, M. Merz, A.-A. Haghighirad, M. Le Tacon
DOI 10.1103/PhysRevMaterials.9.044801 · Physical Review Materials
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Abstract
BaNi2As2, a structural analog to the iron-based parent compound BaFe2As2, offers a unique platform to study the interplay between superconductivity, charge density waves, and, possibly, electronic nematicity. Here, we report on the growth and characterization of Ba1−xCaxNi2As2 single crystals with 0≤x≤0.1, using a combination of x-ray diffraction, diffuse x-ray scattering, heat capacity, and electronic transport measurements. Our results demonstrate that calcium substitution affects the structural, electronic, and thermodynamic properties of BaNi2As2 in a way that is strongly reminiscent of moderate hydrostatic pressures albeit with marked differences. In particular, Ca substitution efficiently suppresses both the triclinic structural transition and the associated commensurate charge density wave formation, while increasing the superconducting transition temperature. We found that the substitution range in which the crystals remain homogeneous is limited with concentrations x≥0.04 exhibiting intense diffuse x-ray scattering indicative of stacking fault formation, which, despite the preserved integrity of the NiAs layers, prevents investigation up to concentrations where chemical pressure is expected to completely suppress the structural instability.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaNi2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.6 | Pressure not reported | unknown |
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