The magneto-structural relationship in the tetrahedral spin chain oxide CsCoO$_2$

N. Z. Ali; R. C. Williams; F. Xiao; S. J. Clark; T. Lancaster; S. J. Blundell; D. V. Sheptyakov; M. Jansen

doi:10.1103/PhysRevB.91.024419

The magneto-structural relationship in the tetrahedral spin chain oxide CsCoO$_2$

Strongly Correlated Electrons 2015-06-23 v1

Authors: N. Z. Ali , R. C. Williams , F. Xiao , S. J. Clark , T. Lancaster , S. J. Blundell , D. V. Sheptyakov , M. Jansen

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Abstract

We have investigated the structural and magnetic transitions in CsCoO $_2$ using calorimetric measurements, neutron powder diffraction (NPD), density functional theory (DFT) calculations and muon-spin relaxation ( $\mu$ SR) measurements. CsCoO $_2$ exhibits three-dimensional long-range antiferromagnetic (AFM) order at 424~K, resulting in antiferromagnetic alignment of chains of ferromagnetically ordered Co-Co spin dimers. Although there is no change in magnetic structure around a structural transition at $T^{*}=100$ ~K, the resulting bifurcation of corner-shared Co--O--Co bond angles causes a weakening of the AFM interaction for one set of bonds along the chains. Consequently, the system undergoes a complex freezing out of relaxation processes on cooling.

Keywords

CsCoO$_2$ tetrahedral spin chain magnetic transition structural transition antiferromagnetic order neutron powder diffraction muon-spin relaxation

Cite

@article{arxiv.1410.3686,
  title  = {The magneto-structural relationship in the tetrahedral spin chain oxide CsCoO$_2$},
  author = {N. Z. Ali and R. C. Williams and F. Xiao and S. J. Clark and T. Lancaster and S. J. Blundell and D. V. Sheptyakov and M. Jansen},
  journal= {arXiv preprint arXiv:1410.3686},
  year   = {2015}
}

The magneto-structural relationship in the tetrahedral spin chain oxide CsCoO$_2$

Abstract

Keywords

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