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Title: Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in Ca 1 - x Sr x Co 2 - y As 2

Abstract

In search of a quantum phase transition between the two-dimensional ( 2 D ) ferromagnetism of CaCo 2 - y As 2 and stripe-type antiferromagnetism in SrCo 2 As 2 , we instead find evidence for 1 D magnetic frustration between magnetic square Co layers. We present neutron-diffraction data for Ca 1 - x Sr x Co 2 - y As 2 that reveal a sequence of x -dependent magnetic transitions which involve different stacking of 2 D ferromagnetically aligned layers with different magnetic anisotropy. We explain the x -dependent changes to the magnetic order by utilizing classical analytical calculations of a 1 D Heisenberg model where single-ion magnetic anisotropy and frustration of antiferromagnetic nearest- and next-nearest-layer exchange interactions are all composition dependent.

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States); Washington State Univ., Pullman, WA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1542872
Alternate Identifier(s):
OSTI ID: 1543200; OSTI ID: 1546435
Report Number(s):
IS-J-9975
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC02-07 CH11358; AC2-06 CH11357; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 2; 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

Li, Bing, Sizyuk, Y., Sangeetha, N. S., Wilde, J. M., Das, P., Tian, W., Johnston, D. C., Goldman, A. I., Kreyssig, A., Orth, P. P., McQueeney, R. J., and Ueland, B. G. Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in Ca1-xSrxCo2-yAs2. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.024415.
Li, Bing, Sizyuk, Y., Sangeetha, N. S., Wilde, J. M., Das, P., Tian, W., Johnston, D. C., Goldman, A. I., Kreyssig, A., Orth, P. P., McQueeney, R. J., & Ueland, B. G. Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in Ca1-xSrxCo2-yAs2. United States. https://doi.org/10.1103/PhysRevB.100.024415
Li, Bing, Sizyuk, Y., Sangeetha, N. S., Wilde, J. M., Das, P., Tian, W., Johnston, D. C., Goldman, A. I., Kreyssig, A., Orth, P. P., McQueeney, R. J., and Ueland, B. G. Mon . "Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in Ca1-xSrxCo2-yAs2". United States. https://doi.org/10.1103/PhysRevB.100.024415. https://www.osti.gov/servlets/purl/1542872.
@article{osti_1542872,
title = {Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in Ca1-xSrxCo2-yAs2},
author = {Li, Bing and Sizyuk, Y. and Sangeetha, N. S. and Wilde, J. M. and Das, P. and Tian, W. and Johnston, D. C. and Goldman, A. I. and Kreyssig, A. and Orth, P. P. and McQueeney, R. J. and Ueland, B. G.},
abstractNote = {In search of a quantum phase transition between the two-dimensional (2D) ferromagnetism of CaCo2-yAs2 and stripe-type antiferromagnetism in SrCo2As2, we instead find evidence for 1D magnetic frustration between magnetic square Co layers. We present neutron-diffraction data for Ca1-xSrxCo2-yAs2 that reveal a sequence of x-dependent magnetic transitions which involve different stacking of 2D ferromagnetically aligned layers with different magnetic anisotropy. We explain the x-dependent changes to the magnetic order by utilizing classical analytical calculations of a 1D Heisenberg model where single-ion magnetic anisotropy and frustration of antiferromagnetic nearest- and next-nearest-layer exchange interactions are all composition dependent.},
doi = {10.1103/PhysRevB.100.024415},
journal = {Physical Review B},
number = 2,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}

Journal Article:

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Cited by: 5 works
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Figures / Tables:

FIG. 1 FIG. 1: Chemical and magnetic structures of Ca1−xSrxCo2−yAs2, and the magnetic phase diagram based on magnetization data from Ref. [19]. The AF1 phase has A-type antiferromagnetic (AF) order characterized by an AF propagation vector of τ = (0, 0, 1), and consists of ferromagnetic Co layers stacked AF along themore » crystalline c axis (+−+−). The ordered magnetic moment µ lies parallel to c. The UNK phase has a ++−− structure with τ = (0, 0, 1 2 ) and µ ‖ c. The AF2 phase has τ = (0, 0, 1 2 ) but µ ⊥ c. Its order is either ++−− (left), or a clock-type AF structure (right). The occurrence of magnetic domains prevents us from distinguishing between these structures. Similarly, an amplitude-modulated spin-density wave cannot be ruled out. PM stands for paramagnetic and µ is given per Co atom. The diagrams were created with VESTA.« less

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Works referencing / citing this record:

Flat-band magnetism and helical magnetic order in Ni-doped SrCo 2 As 2
journal, September 2019


Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr ( Co 1 x Ni x ) 2 As 2 single crystals
journal, September 2019


Helical magnetic ordering in Sr ( Co 1 x Ni x ) 2 As 2
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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.