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Unconventional field-induced spin gap in an S=1/2 Chiral Staggered Chain.

Liu, J. and Kittaka, S. and Johnson, R. D. and Lancaster, T. and Singleton, J. and Sakakibara, T. and Kohama, Y. and van Tol, J. and Ardavan, A. and Williams, B. H. and Blundell, S. J. and Manson, Z. E. and Manson, J. L. and Goddard, P. A. (2019) 'Unconventional field-induced spin gap in an S=1/2 Chiral Staggered Chain.', Physical review letters., 122 (5). 057207.


We investigate the low-temperature magnetic properties of the molecule-based chiral spin chain ½CuðpymÞðH2OÞ4SiF6 · H2O (pym ¼ pyrimidine). Electron-spin resonance, magnetometry and heat capacity measurements reveal the presence of staggered g tensors, a rich low-temperature excitation spectrum, a staggered susceptibility, and a spin gap that opens on the application of a magnetic field. These phenomena are reminiscent of those previously observed in nonchiral staggered chains, which are explicable within the sine-Gordon quantum-field theory. In the present case, however, although the sineGordon model accounts well for the form of the temperature dependence of the heat capacity, the size of the gap and its measured linear field dependence do not fit with the sine-Gordon theory as it stands. We propose that the differences arise due to additional terms in the Hamiltonian resulting from the chiral structure of ½CuðpymÞðH2OÞ4SiF6 · H2O, particularly a uniform Dzyaloshinskii-Moriya coupling and a fourfold periodic staggered field.

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Publisher statement:Reprinted with permission from the American Physical Society: Liu, J., Kittaka, S., Johnson, R. D., Lancaster, T., Singleton, J., Sakakibara, T., Kohama, Y., van Tol, J., Ardavan, A., Williams, B. H., Blundell, S. J., Manson, Z. E., Manson, J. L. & Goddard, P. A. (2019). Unconventional Field-Induced Spin Gap in an S=1/2Chiral Staggered Chain. Physical Review Letters 122(5): 057207 © 2019 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:04 January 2019
Date deposited:12 February 2019
Date of first online publication:08 February 2019
Date first made open access:12 February 2019

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