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MA: Fachverband Magnetismus

MA 1: Computational Magnetism I

MA 1.6: Vortrag

Montag, 16. März 2020, 10:45–11:00, HSZ 04

Thermodynamics of the S=1/2 Pyrochlore Antiferromagnet — •Robin Schaefer, David Luitz, and Imre Hagymási — Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany

Studying three-dimensional frustrated quantum magnets is a challenging problem in general. Here we use several complementary techniques to study the high temperature behavior of the low spin pyrochlore quantum antiferromagnet: DMRG and quantum typicality yield exact results for small systems.
In order to test the stability of the features in the specific heat in the thermodynamic limit, we use the numerical linked cluster expansion, a systematic high temperature series expansion.
Rather than the usual approach based on clusters composed of single spins, we use physically motivated clusters of complete tetrahedra (i.e. complete unit cells), effectively allowing to access much higher orders of the expansion than otherwise possible. This combination of methods yields consistent results on the location of the high temperature peak of the specific heat.