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oai:recercat.cat:2445/1189332025-12-04T20:43:55Zcom_2072_1057col_2072_478822col_2072_478917

Mixed-order phase transition in a colloidal crystal Alert Zenón, Ricard Tierno, Pietro Casademunt i Viader, Jaume Transformacions de fase (Física estadística) Fenòmens crítics (Física) Col·loides Phase transformations (Statistical physics) Critical phenomena (Physics) Colloids Mixed-order phase transitions display a discontinuity in the order parameter like first-order transitions yet feature critical behavior like second-order transitions. Such transitions have been predicted for a broad range of equilibrium and nonequilibrium systems, but their experimental observation has remained elusive. Here, we analytically predict and experimentally realize a mixed-order equilibrium phase transition. Specifically, a discontinuous solid-solid transition in a 2D crystal of paramagnetic colloidal particles is induced by a magnetic field HH. At the transition field HsHs, the energy landscape of the system becomes completely flat, which causes diverging fluctuations and correlation length ξ∝|H2−H2s|−1/2ξ∝|H2−Hs2|−1/2. Mean-field critical exponents are predicted, since the upper critical dimension of the transition is du=2du=2. Our colloidal system provides an experimental test bed to probe the unconventional properties of mixed-order phase transitions. 2018-01-09T17:35:53Z 2018-01-09T17:35:53Z 2017-12-05 2018-01-09T17:35:53Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 0027-8424 https://hdl.handle.net/2445/118933 674869 29158388 eng Versió postprint del document publicat a: https://doi.org/10.1073/pnas.1712584114 Proceedings of the National Academy of Sciences of the United States of America - PNAS, 2017, vol. 114, num. 49, p. 12906-12909 https://doi.org/10.1073/pnas.1712584114 info:eu-repo/grantAgreement/EC/FP7/335040/EU//DYNAMO (c) Alert, Ricard et al., 2017 info:eu-repo/semantics/openAccess 4 p. application/pdf National Academy of Sciences Articles publicats en revistes (Física de la Matèria Condensada)