Unconventional Charge Density Wave Order in the Pnictide Superconductor
- Univ. of Illinois, Urbana, IL (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Pohang Accelerator Lab, Gyeongbuk (Republic of Korea)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. of Maryland, College Park, MD (United States)
- Utrecht Univ., Utrecht (Netherlands)
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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- FG02-06ER46285; AC02-76SF00515; FA9550-14-1-0332; GBMF4542; GBMF4419
- OSTI ID:
- 1526465
- Alternate ID(s):
- OSTI ID: 1506734; OSTI ID: 1958823
- Journal Information:
- Physical Review Letters, Vol. 122, Issue 14; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Sixfold enhancement of superconductivity in a tunable electronic nematic system
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journal | December 2019 |
Sixfold enhancement of superconductivity in a tunable electronic nematic system | text | January 2019 |
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