Zero-field and longitudinal field ${\mu }^{+}\mathrm{SR}$ measurements as a function of temperature on ${\left[\mathrm{}\right(\mathrm{D}\mathrm{T}-\mathrm{T}\mathrm{T}\mathrm{F})\mathrm{}}_2{\left]\right[\mathrm{Au}\left(\mathrm{mnt}\right)\mathrm{}}_2]$ have confirmed that this compound is a molecular material with a two-leg spin-ladder configuration. The results corroborate the theoretical expectations for the absence of magnetic order in even-leg spin ladders with the quantum spin-liquid state realized, despite the somewhat strong ladder-ladder interactions present. Slowly fluctuating local fields are evident below 20 K and could originate from chain breaks.

• Received 3 February 1999

DOI:https://doi.org/10.1103/PhysRevB.60.4191