Unconventional Charge Density Wave Order in the Pnictide Superconductor Ba(Ni1–xCox)2As2

Lee, Sangjun; de la Peña, Gilberto; Sun, Stella X. -L.; Mitrano, Matteo; Fang, Yizhi; Jang, Hoyoung; Lee, Jun -Sik; Eckberg, Chris; Campbell, Daniel; Collini, John; Paglione, Johnpierre; de Groot, F. M. F.; Abbamonte, Peter

doi:10.1103/physrevlett.122.147601

Title: Unconventional Charge Density Wave Order in the Pnictide Superconductor $Ba ({Ni}_{1 - x} {Co}_{x})_{2} {As}_{2}$

Journal Article · Fri Apr 12 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.122.147601· OSTI ID:1526465

Lee, Sangjun ^[1]; de la Peña, Gilberto ^[1]; Sun, Stella X. -L. ^[1]; Mitrano, Matteo ^[1]; Fang, Yizhi ^[1]; Jang, Hoyoung ^[2]; Lee, Jun -Sik ^[3]; Eckberg, Chris ^[4]; Campbell, Daniel ^[4]; Collini, John ^[4]; Paglione, Johnpierre ^[4]; de Groot, F. M. F. ^[5]; Abbamonte, Peter ^[1]

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(Ni_1–xCo_x)₂As₂ is a structural homologue of the pnictide high temperature superconductor, Ba(Fe_1–xCo_x)₂As₂, in which the Fe atoms are replaced by Ni. Superconductivity is highly suppressed in this system, reaching a maximum T_c = 2.3 K, compared to 24 K in its iron-based cousin, and the origin of this T_c suppression is not known. Using x-ray scattering, we show that Ba(Ni_1–xCo_x)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 T_c suppression in this system.

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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

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Cited by: 16 works

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Cited By (2)

Sixfold enhancement of superconductivity in a tunable electronic nematic system Eckberg, Chris; Campbell, Daniel J.; Metz, Tristin Nature Physics, Vol. 16, Issue 3 https://doi.org/10.1038/s41567-019-0736-9	journal	December 2019
Sixfold enhancement of superconductivity in a tunable electronic nematic system Eckberg, Chris; Campbell, Daniel J.; Metz, Tristin arXiv https://doi.org/10.48550/arxiv.1903.00986	text	January 2019

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75 CONDENSED MATTER PHYSICS
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Title: Unconventional Charge Density Wave Order in the Pnictide Superconductor Ba ( Ni 1 – x Co x ) 2 As 2

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Title: Unconventional Charge Density Wave Order in the Pnictide Superconductor $Ba ({Ni}_{1 - x} {Co}_{x})_{2} {As}_{2}$