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18 April 2024
 
  » arxiv » 1905.4913

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Probing magnetic order and disorder in the one-dimensional molecular spin chains CuF2(pyz) and [Ln(hfac)3(boaDTDA)]n (Ln=Sm, La) using implanted muons
T. Lancaster ; B.M. Huddart ; R.C. Williams ; F. Xiao ; K.J.A. Franke ; P.J. Baker ; F.L. Pratt ; S.J. Blundell ; J.A. Schlueter ; M.B. Mills ; A.C. Maahs ; K.E. Preuss ;
Date 13 May 2019
AbstractWe present the results of muon-spin relaxation ($mu^{+}$SR) measurements on antiferromagnetic and ferromagnetic spin chains. In antiferromagnetic CuF$_{2}$(pyz) we identify a transition to long range magnetic order taking place at $T_{mathrm{N}} = 0.6(1)$ K, allowing us to estimate a ratio with the intrachain exchange of $T_{mathrm{N}}/|J| approx 0.1$ and the ratio of interchain to intrachain exchange coupling as $|J’/J| approx 0.05$. The ferromagnetic chain [Sm(hfac)$_{3}$(boaDTDA)]$_{n}$ undergoes an ordering transition at $T_{mathrm{c}}=2.8(1)$ K, seen via a broad freezing of dynamic fluctuations on the muon (microsecond) timescale and implying $T_{mathrm{c}}/|J| approx 0.6$. The ordered radical moment continues to fluctuate on this timescale down to 0.3 K, while the Sm moments remain disordered. In contrast, the radical spins in [La(hfac)$_{3}$(boaDTDA)]$_{n}$ remain magnetically disordered down to $T=0.1$ K suggesting $T_{mathrm{c}}/|J| < 0.17$.
Source arXiv, 1905.4913
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