Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 46: Poster Session: Frustrated Magnets, Quantum Magnets, Charge Order and Complex Oxids

TT 46.16: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/2OG

Mean-field study of the magnetocaloric effect in a quasi-one-dimensional bimetallic compound — •Maheshwor Tiwari and Andreas Honecker — Laboratoire de Physique Théorique et Modélisation, CNRS (UMR 8089), Université de Cergy-Pontoise, France

Understanding the nature of all possible ground states, in particular, field-induced phases of antiferromagnets, represents an important first step towards understanding their thermodynamic properties, and in particular the magnetocaloric effect. MnNi(NO2)4(en)2, en = ethylenediamine, contains ferromagnetically coupled chains with alternating spins of magnitude 1 and 5/2. Here a self-consistent mean-field calculation of the corresponding mixed-spin model with antiferromagnetic exchange between the chains, single ion anisotropy (D), and Zeeman coupling to a magnetic field parallel to the easy axis gives rise to an antiferromagnetic state and a spin-flop transition. We construct the full phase diagram in the H-T plane and discuss the different magnetic states. The antiferromagnetic interchain coupling gives rise to a low ordering temperature and a low saturation field that promise interesting magnetocaloric properties, as we verify by computation of the thermodynamic properties of the model in a magnetic field.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden