Quantum-critical phase transition in the novel chiral chain compound [Cu(pym)(H<sub>2</sub>O)<sub>4</sub>]SiF<sub>6</sub> <sup>.</sup> H<sub>2</sub>O observed in magnetic fields of up to 73 T
ORAL
Abstract
The four inequivalent Cu ions in the novel chiral chain compound [Cu(pym)(H2O)4]SiF6 . H2O experience a staggered local environment with an extra twist: a four-fold chiral structure. The consequent hierarchy of competing interactions leads to unconventional magnetic-field-dependent behavior. In this study we report measurements of the magnetization and magnetocaloric effect of single crystals of [Cu(pym)(H2O)4]SiF6 H2O in magnetic fields of up to 73 T and at temperatures down to 0.5 K. Field orientations parallel and perpendicular to the chains were used. The data reveal several unusual features, including a field-induced quantum-critical phase transition close to saturation magnetization that is absent in more conventional Sine-Gordon chains.
*NHMFL is supported by NSF Cooperative Agreement Nos. DMR-2128556 and DMR-1644779, the DOE and the State of Florida. Work at EWU is funded by National Science Foundation (NSF) grant No. DMR-1703003. J.S. acknowledges support from the Strongly Correlated Magnets thrust of the DoE BES ”Science in 100T” program and a visiting professorship at Oxford University. Warwick University acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 681260).
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Publication: J. Singleton, PA. Goddard, J.M. Blawat et al., preprint.
Presenters
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John Singleton
- NHMFL/ LANL
- NHMFL, Los Alamos National Laboratory
- Los Alamos National Laboratory