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On the mechanism behind the inverse melting in systems with competing interactions
Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil..
Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil..
KTH, School of Engineering Sciences (SCI), Physics.
2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 2020Article in journal (Refereed) Published
Abstract [en]

The competition between a short range attractive interaction and a nonlocal repulsive interaction promote the appearance of modulated phases. In this work we present the microscopic mechanisms leading to the emergence of inverse transitions in such systems by considering a thorough mean-field analysis of a variety of minimal models with different competing interactions. We identify the specific connections between the characteristic energy of the homogeneous and modulated phases and the observed reentrant behaviors in the phase diagram. In particular, we find that reentrance is appreciable when the characteristic energy cost of the homogeneous and modulated phases are comparable to each other, and for systems in which the local order parameter is limited. In the asymptotic limit of high energy cost of the homogeneous phase we observe that the degree of reentrance decreases exponentially with the ratio of the characteristic energy cost of homogeneous and modulated phases. These mean-field results are confronted with Langevin simulations of an effective coarse grained model, confirming the expected extension of the reentrance in the phase diagram. These results shed new light on many systems undergoing inverse melting transitions by qualitatively improving the understanding of the interplay of entropy and energy around the inverse melting points.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2019. Vol. 9, article id 2020
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Other Engineering and Technologies not elsewhere specified
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URN: urn:nbn:se:kth:diva-245135DOI: 10.1038/s41598-018-38465-8ISI: 000458619600020PubMedID: 30765837Scopus ID: 2-s2.0-85061574004OAI: oai:DiVA.org:kth-245135DiVA, id: diva2:1296054
Note

QC 20190313

Available from: 2019-03-13 Created: 2019-03-13 Last updated: 2019-03-13Bibliographically approved

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Diaz-Mendez, Rogelio

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