{"@context":"http://iiif.io/api/presentation/2/context.json","@type":"sc:Manifest","@id":"https://iiif.quartexcollections.com/portland/iiif/3e2d6c79-c1f2-45d5-8455-d656049dfbbb/manifest","label":"Phase transitions in the two-dimensional superantiferromagnetic I","metadata":[{"label":"Title","value":"Phase transitions in the two-dimensional superantiferromagnetic Ising model with next-nearest-neighbor interactions"},{"label":"Collection","value":["Physics Faculty Publications"]},{"label":"Relation","value":"phy"},{"label":"Author","value":"A. Saguia, B. Boechat, J. Florencio, O. F.de Alcantara Bonfim"},{"label":"Journal Title","value":"Physical Review E"},{"label":"Abstract","value":"We use Monte Carlo and transfer matrix methods in combination with extrapolation schemes to determine the phase diagram of the two-dimensional superantiferromagnetic (SAF) Ising model with next-nearest-neighbor (NNN) interactions in a magnetic field. The interactions between nearest-neighbor (NN) spins are ferromagnetic along x, and antiferromagnetic along Y. We find that for sufficiently low temperatures and fields, there exists a region limited by a critical line of second-order transitions separating a SAF phase from a magnetically induced paramagnetic phase. We did not find any region with either first-order transition or with reentrant behavior. The NNN couplings produce either an expansion or a contraction of the SAF phase. Expansion occurs when the interactions are antiferromagnetic, and contraction when they are ferromagnetic. There is a critical ratio Rc=½ between NNN and NN couplings, beyond which the SAF phase no longer exists."},{"label":"DOI","value":"10.1103/PhysRevE.87.052140"},{"label":"Volume","value":"87"},{"label":"Issue","value":"5"},{"label":"Publication Date","value":"D:00 M:00 Y:2013"},{"label":"Publication Information","value":"Physical Review E, 2013, Volume 87, Issue 5, 1-5. © 2013 American Physical Society Archived version is the final published version."}],"description":"Phase transitions in the two-dimensional superantiferromagnetic Ising model with next-nearest-neighbor interactions","sequences":[{"@type":"sc:Sequence","canvases":[{"@id":"https://iiif.quartexcollections.com/portland/iiif/3e2d6c79-c1f2-45d5-8455-d656049dfbbb/canvas/_1","@type":"sc:Canvas","label":"Phase transitions in the two-dimensional superantiferromagnetic 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