Helical magnetic ordering in Sr(Co1-xNix)2As2

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.

doi:10.1103/PhysRevB.100.161113

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

Journal Article · 29 October 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.100.161113 · OSTI ID:1606994

^[1]; Kreyssig, A. ^[1];

^[1]; Sangeetha, N. S. ^[1];

^[1];

^[2];

^[1]; Johnston, David C. ^[1];

^[1]; McQueeney, R. J. ^[1]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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(Co_1-xNi_x)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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1606994

Journal Information:: Physical Review B, Vol. 100, Issue 16; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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