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

摘要: We present the results of muon-spin relaxation ($\mu^{+}$SR) measurements on antiferromagnetic and ferromagnetic spin chains. In CuF$_{2}$(pyz) we identify a transition to long range magnetic order taking place at $T_{\mathrm{N}} = 0.6(1)$ K, allowing us estimate ratio with intrachain exchange $T_{\mathrm{N}}/|J| \approx 0.1$ interchain coupling as $|J'/J| 0.05$. The chain [Sm(hfac)$_{3}$(boaDTDA)]$_{n}$ undergoes an ordering $T_{\mathrm{c}}=2.8(1)$ seen via broad freezing dynamic fluctuations muon (microsecond) timescale implying $T_{\mathrm{c}}/|J| 0.6$. ordered radical moment continues fluctuate this down 0.3 while Sm moments remain disordered. contrast, spins in [La(hfac)$_{3}$(boaDTDA)]$_{n}$ magnetically disordered $T=0.1$ K suggesting < 0.17$.