Ortix C, Lorenzana J, Di Castro C
Dipartimento di Fisica, Università del Salento and INFN Sezione di Lecce, Via per Arnesano, 73100 Lecce, Italy.
Phys Rev Lett. 2008 Jun 20;100(24):246402. doi: 10.1103/PhysRevLett.100.246402. Epub 2008 Jun 16.
Using numerical techniques and asymptotic expansions we obtain the phase diagram of a paradigmatic model of Coulomb-frustrated phase separation in systems with negative short-range compressibility. The transition from the homogeneous phase to the inhomogeneous phase is generically first order in isotropic three-dimensional systems except for a critical point. Close to the critical point, inhomogeneities are predicted to form a bcc lattice with subsequent transitions to a triangular lattice of rods and a layered structure. Inclusion of a strong anisotropy allows for second- and first-order transition lines joined by a tricritical point.
利用数值技术和渐近展开，我们得到了具有负短程压缩性的系统中库仑受挫相分离典型模型的相图。在各向同性三维系统中，从均匀相到非均匀相的转变一般是一级的，但存在一个临界点除外。在临界点附近，预计不均匀性会形成体心立方晶格，随后转变为棒状三角晶格和层状结构。引入强各向异性会产生由三临界点连接的二级和一级转变线。
