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We investigate the low-temperature magnetic properties of the molecule-basedchiral spin chain [Cu(pym)(H$_2$O)$_4$]SiF$_6\cdot$H$_2$O (pym = pyrimidine).Electron-spin resonance, magnetometry and heat capacity measurements reveal thepresence of staggered $g$ tensors, a rich low-temperature excitation spectrum,a staggered susceptibility and a spin gap that opens on the application of amagnetic field. These phenomena are reminiscent of those previously observed innon-chiral staggered chains, which are explicable within the sine-Gordonquantum-field theory. In the present case, however, although the sine-Gordonmodel accounts well for the form of the temperature-dependence of the heatcapacity, the size of the gap and its measured linear field dependence do notfit with the sine-Gordon theory as it stands. We propose that the differencesarise due to additional terms in the Hamiltonian resulting from the chiralstructure of [Cu(pym)(H$_2$O)$_4$]SiF$_6\cdot$H$_2$O, particularly a uniformDzyaloshinskii-Moriya coupling and a four-fold periodic staggered field.

Unconventional field-induced spin gap in an $S = 1/2$ chiral staggered chain