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

Abstract

Ba(Ni 1–xCo x) 2As 2 is a structural homologue of the pnictide high temperature superconductor, Ba(Fe 1–xCo x) 2As 2, 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(Ni 1–xCo x) 2As 2 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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [4];  [4];  [5];  [1]
  1. Univ. of Illinois, Urbana, IL (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Pohang Accelerator Lab, Gyeongbuk (Republic of Korea)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Univ. of Maryland, College Park, MD (United States)
  5. Utrecht Univ., Utrecht (Netherlands)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1526465
Alternate Identifier(s):
OSTI ID: 1506734
Grant/Contract Number:  
FG02-06ER46285; AC02-76SF00515; FA9550-14-1-0332; GBMF4542; GBMF4419
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 14; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

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., and Abbamonte, Peter. Unconventional Charge Density Wave Order in the Pnictide Superconductor Ba(Ni1–xCox)2As2. United States: N. p., 2019. Web. doi:10.1103/physrevlett.122.147601.
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. Unconventional Charge Density Wave Order in the Pnictide Superconductor Ba(Ni1–xCox)2As2. United States. doi:10.1103/physrevlett.122.147601.
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., and Abbamonte, Peter. Fri . "Unconventional Charge Density Wave Order in the Pnictide Superconductor Ba(Ni1–xCox)2As2". United States. doi:10.1103/physrevlett.122.147601.
@article{osti_1526465,
title = {Unconventional Charge Density Wave Order in the Pnictide Superconductor Ba(Ni1–xCox)2As2},
author = {Lee, Sangjun and de la Peña, Gilberto and Sun, Stella X. -L. and Mitrano, Matteo and Fang, Yizhi and Jang, Hoyoung and Lee, Jun -Sik and Eckberg, Chris and Campbell, Daniel and Collini, John and Paglione, Johnpierre and de Groot, F. M. F. and Abbamonte, Peter},
abstractNote = {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.},
doi = {10.1103/physrevlett.122.147601},
journal = {Physical Review Letters},
number = 14,
volume = 122,
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 12, 2020
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