AI Article Synopsis
- The study examines how nickel doping in BaFe(2-x)Ni(x)As2 affects its structural and magnetic properties, revealing a shift in phase transition temperatures with increased doping.
- The tetragonal-to-orthorhombic structural transition (T(s)) and the antiferromagnetic transition (T(N)) become separated as doping increases, with a notable approach toward a quantum bicritical point which correlates with optimal superconductivity.
- A secondary magnetic phase forms at certain doping levels, leading to a situation where T(N) aligns closely with the superconducting transition temperature (T(c)), suggesting an avoided quantum critical point that impacts both normal and superconducting behavior.
Article Abstract
We study the structural and magnetic orders in electron-doped BaFe(2-x)Ni(x)As2 by high-resolution synchrotron x-ray and neutron scatterings. Upon Ni doping x, the nearly simultaneous tetragonal-to-orthorhombic structural (T(s)) and antiferromagnetic (T(N)) phase transitions in BaFe2As2 are gradually suppressed and separated, resulting in T(s)>T(N) with increasing x, as was previously observed. However, the temperature separation between T(s) and T(N) decreases with increasing x for x≥0.065, tending toward a quantum bicritical point near optimal superconductivity at x≈0.1. The zero-temperature transition is preempted by the formation of a secondary incommensurate magnetic phase in the region 0.088≲x≲0.104, resulting in a finite value of T(N)≈T(c) + 10 K above the superconducting dome around x≈0.1. Our results imply an avoided quantum critical point, which is expected to strongly influence the properties of both the normal and superconducting states.
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| http://dx.doi.org/10.1103/PhysRevLett.110.257001 | DOI Listing |
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