title: Nonmonotonic magnetic susceptibility of dipolar hard-spheres at low temperature and density.
abstract: We investigate, via numerical simulations, mean field, and density functional theories, the magnetic response of a dipolar hard sphere fluid at low temperatures and densities, in the region of strong association. The proposed parameter-free theory is able to capture both the density and temperature dependence of the ring-chain equilibrium and the contribution to the susceptibility of a chain of generic length. The theory predicts a nonmonotonic temperature dependence of the initial (zero field) magnetic susceptibility, arising from the competition between magnetically inert particle rings and magnetically active chains. Monte Carlo simulation results closely agree with the theoretical findings.
authors.affiliation: Ural Federal University, Lenin Avenue 51, 620083, Ekaterinburg, Russia and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, 00185 Roma, Italy.
authors.forename: Sofia
authors.initials: S
authors.lastname: Kantorovich
authors.affiliation: Ural Federal University, Lenin Avenue 51, 620083, Ekaterinburg, Russia.
authors.forename: Alexey O
authors.initials: AO
authors.lastname: Ivanov
authors.affiliation: Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, 00185 Roma, Italy.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Rovigatti
authors.affiliation: Instituto Superior de Engenharia de Lisboa-ISEL, Rua Conselheiro Emídio Navarro 1, P-1950-062 Lisbon, Portugal and Centro de Física Teórica e Computacional, Avenida Professor Gama Pinto 2, P-1649-003 Lisbon, Portugal.
authors.forename: José Maria
authors.initials: JM
authors.lastname: Tavares
authors.affiliation: Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, 00185 Roma, Italy and CNR-ISC, Università di Roma La Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Sciortino