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Title: Helical magnetic ordering in Sr ( Co 1 - x Ni x ) 2 As 2

Abstract

SrCo2As2 is a peculiar itinerant magnetic system that does not order magnetically, but inelastic neutron-scattering experiments observe the same stripe-type antiferromagnetic (AF) fluctuations found in many of the Fe-based superconductors along with evidence of magnetic frustration. Here we present results from neutron diffraction measurements on single crystals of Sr(Co1-xNix)2As2 that show the development of long-range AF order with Ni doping. However, the AF order is not stripe type. Rather, the magnetic structure consists of ferromagnetically aligned (FM) layers (with moments laying in the layer) that are AF arranged along c with an incommensurate propagation vector of (0 0 τ), i.e., a helix. Using high-energy x-ray diffraction, we find no evidence for a temperature-induced structural phase transition that would indicate a collinear AF order. This finding supports a picture of competing FM and AF interactions within the square transition-metal layers due to flat-band magnetic instabilities. However, the composition dependence of the propagation vector suggests that far more subtle Fermi surface and orbital effects control the interlayer magnetic correlations.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]
  1. Ames Lab., and Iowa State Univ., Ames, IA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1606994
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Wilde, John M., Kreyssig, A., Vaknin, D., Sangeetha, N. S., Li, Bing, Tian, Wei, Orth, Peter P., Johnston, David C., Ueland, B. G., and McQueeney, R. J. Helical magnetic ordering in Sr(Co1-xNix)2As2. United States: N. p., 2019. Web. https://doi.org/10.1103/PhysRevB.100.161113.
Wilde, John M., Kreyssig, A., Vaknin, D., Sangeetha, N. S., Li, Bing, Tian, Wei, Orth, Peter P., Johnston, David C., Ueland, B. G., & McQueeney, R. J. Helical magnetic ordering in Sr(Co1-xNix)2As2. United States. https://doi.org/10.1103/PhysRevB.100.161113
Wilde, John M., Kreyssig, A., Vaknin, D., Sangeetha, N. S., Li, Bing, Tian, Wei, Orth, Peter P., Johnston, David C., Ueland, B. G., and McQueeney, R. J. Tue . "Helical magnetic ordering in Sr(Co1-xNix)2As2". United States. https://doi.org/10.1103/PhysRevB.100.161113. https://www.osti.gov/servlets/purl/1606994.
@article{osti_1606994,
title = {Helical magnetic ordering in Sr(Co1-xNix)2As2},
author = {Wilde, John M. and Kreyssig, A. and Vaknin, D. and Sangeetha, N. S. and Li, Bing and Tian, Wei and Orth, Peter P. and Johnston, David C. and Ueland, B. G. and McQueeney, R. J.},
abstractNote = {SrCo2As2 is a peculiar itinerant magnetic system that does not order magnetically, but inelastic neutron-scattering experiments observe the same stripe-type antiferromagnetic (AF) fluctuations found in many of the Fe-based superconductors along with evidence of magnetic frustration. Here we present results from neutron diffraction measurements on single crystals of Sr(Co1-xNix)2As2 that show the development of long-range AF order with Ni doping. However, the AF order is not stripe type. Rather, the magnetic structure consists of ferromagnetically aligned (FM) layers (with moments laying in the layer) that are AF arranged along c with an incommensurate propagation vector of (0 0 τ), i.e., a helix. Using high-energy x-ray diffraction, we find no evidence for a temperature-induced structural phase transition that would indicate a collinear AF order. This finding supports a picture of competing FM and AF interactions within the square transition-metal layers due to flat-band magnetic instabilities. However, the composition dependence of the propagation vector suggests that far more subtle Fermi surface and orbital effects control the interlayer magnetic correlations.},
doi = {10.1103/PhysRevB.100.161113},
journal = {Physical Review B},
number = 16,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}

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