Weak ferromagnetism and glassy state in kappa-(BEDT-TTF)2Hg(SCN)2Br

M. Hemmida; H. -A. Krug von Nidda; B. Miksch; L. L. Samoilenko; A. Pustogow; S. Widmann; A. Henderson; T. Siegrist; J. Schlueter; A. Loidl; M. Dressel

doi:10.1103/PhysRevB.98.241202

Weak ferromagnetism and glassy state in kappa-(BEDT-TTF)2Hg(SCN)2Br

Strongly Correlated Electrons 2018-12-12 v3

Authors: M. Hemmida , H. -A. Krug von Nidda , B. Miksch , L. L. Samoilenko , A. Pustogow , S. Widmann , A. Henderson , T. Siegrist , J. Schlueter , A. Loidl , M. Dressel

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Abstract

Since the first observation of weak ferromagnetism in the charge-transfer salt kappa-(BEDT-TTF)2-Cu[N(CN)2]Cl [U. Welp et al., Phys. Rev. Lett. 69, 840 (1992)], no further evidence of ferromagnetism in this class of organic materials has been reported. Here we present static and dynamic spin susceptibility measurements on kappa-(BEDT-TTF)2Hg(SCN)2Br revealing weak ferromagnetism below about TWF = 20 K. We suggest that frustrated spins in the molecular dimers suppress long-range order, forming a spin-glass ground state in the insulating phase.

Keywords

weak ferromagnetism spin glass organic charge-transfer salt spin susceptibility frustrated spins

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@article{arxiv.1710.04028,
  title  = {Weak ferromagnetism and glassy state in kappa-(BEDT-TTF)2Hg(SCN)2Br},
  author = {M. Hemmida and H. -A. Krug von Nidda and B. Miksch and L. L. Samoilenko and A. Pustogow and S. Widmann and A. Henderson and T. Siegrist and J. Schlueter and A. Loidl and M. Dressel},
  journal= {arXiv preprint arXiv:1710.04028},
  year   = {2018}
}

Weak ferromagnetism and glassy state in kappa-(BEDT-TTF)2Hg(SCN)2Br

Abstract

Keywords

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