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Mean-field phase diagram and spin glass phase of the dipolar Kagome Ising antiferromagnet

Abstract : We derive the equilibrium phase diagram of the classical dipolar Ising antiferromagnet at the mean-field level on a geometry that mimics the two dimensional Kagome lattice. Our mean-field treatment is based on the combination of the cluster variational Bethe-Peierls formalism and the cavity method, developed in the context of the glass transition, and is complementary to the Monte Carlo simulations realized in [Phys. Rev. B 98, 144439 (2018)]. Our results confirm the nature of the low temperature crystalline phase which is reached through a weakly first-order phase transition. Moreover, they allow us to interpret the dynamical slowing down observed in the work of Hamp & al. as a remnant of a spin glass transition taking place at the mean-field level (and expected to be avoided in 2 dimensions).
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Submitted on : Monday, March 30, 2020 - 4:02:45 PM
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Leticia F Cugliandolo, Laura Foini, Marco Tarzia. Mean-field phase diagram and spin glass phase of the dipolar Kagome Ising antiferromagnet. 2020. ⟨cea-02524891⟩



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