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Low-dimensional organic conductors show a rich phase diagram, which has,despite all efforts, still some unexploed regions. Charge ordered phasespresent in many compounds of the (TMTTF)$_2 X$ family are typically studiedwith their unique electronic properties in mind. An influence on the spinarrangement is, however, not expected at first glance. Here, we reporttemperature and angle dependent electron spin resonance (ESR) measurements onthe quasi one-dimensional organic conductor (TMTTF)$_2$NO$_3$. We found thatthe (TMTTF)$_2$NO$_3$ compound develops a peculiar anisotropy with a doubledperiodicity ($ab'$-plane) of the ESR linewidth below about $T_\text{CO}=250\pm10$ K. This behavior is similar to observations in the related compounds(TMTTF)$_2 X$ ($X$ = PF$_6$, SbF$_6$ and AsF$_6$), where it has been attributedto relaxation processes of magnetically inequivalent sites in thecharge-ordered state. For the structural analogous (TMTTF)$_2$ClO$_4$, knownfor the absence of charge order, such angular dependence of the ESR signal isnot observed. Therefore, our ESR measurements lead us to conclude that acharge-order phase is stabilized in the title compound below $T_\text{CO}\approx 250$ K.

Charge-order phase transition in the quasi one-dimensional organic conductor (TMTTF)$_2$NO$_3$