Specific heat and muon spin resonance measurements in Gd(hfac)3NITiPr molecular magnetic chains: indications for a chiral phase without long range helical order

Abstract

Low temperature specific heat $C(T)$ and zero-field muon spin resonance (${\mu }^{+}$SR) measurements were performed in Gd(hfac)${}_3$NITiPr, a quasi one-dimensional molecular magnet with competing nearest neighbor and next-nearest neighbor intrachain exchange interactions. The specific heat data exhibit a $\lambda$-peak at $T_0$=2.08$\pm$0.01K that disappears upon the application of a 5 Tesla magnetic field. Conversely, the ${\mu }^{+}$SR data do not present any anomaly at $T\approx 2$ K, proving the lack of divergence of the two-spin correlation function as required for usual three-dimensional (3D) long range helical order. Moreover, no muon spin precession can be evinced from the ${\mu }^{+}$SR asimmetry curves, thus excluding the presence of a long range ordered magnetic lattice. These results provide indications for a low $T$ phase where chiral order is established in absence of long range helical order.

arXiv comment5 pages, 3 figures

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