Unconventional Charge Density Wave Order in the Pnictide Superconductor Ba(Ni1−xCox)2As2
Sangjun Lee, Gilberto de la Peña, Stella X.-L. Sun, Matteo Mitrano, Yizhi Fang, Hoyoung Jang, Jun-Sik Lee, Chris Eckberg, Daniel Campbell, John Collini, Johnpierre Paglione, F. M. F. de Groot, Peter Abbamonte
DOI 10.1103/PhysRevLett.122.147601 · Physical Review Letters
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Abstract
Ba(Ni1−xCox)2As2 is a structural homologue of the pnictide high temperature superconductor, Ba(Fe1−xCox)2As2, in which the Fe atoms are replaced by Ni. Superconductivity is highly suppressed in this system, reaching a maximum Tc=2.3 K, compared to 24 K in its iron-based cousin, and the origin of this Tc suppression is not known. Using x-ray scattering, we show that Ba(Ni1−xCox)2As2 exhibits a unidirectional charge density wave (CDW) at its triclinic phase transition. The CDW is incommensurate, exhibits a sizable lattice distortion, and is accompanied by the appearance of α Fermi surface pockets in photoemission [B. Zhou et al., Phys. Rev. B 83, 035110 (2011)], suggesting it forms by an unconventional mechanism. Co doping suppresses the CDW, paralleling the behavior of antiferromagnetism in iron-based superconductors. Our study demonstrates that pnictide superconductors can exhibit competing CDW order, which may be the origin of Tc suppression in this system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Ni1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | onset |
| Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | onset |
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