Dresden 2017 – wissenschaftliches Programm

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

TT: Fachverband Tiefe Temperaturen

TT 72: Correlated Electrons: Frustrated Magnets - General 2

TT 72.7: Vortrag

Donnerstag, 23. März 2017, 16:30–16:45, HSZ 204

The response of a triangular antiferromagnet to anisotropic lattice distortion — •Dan Sun1, Jack Bartlett1,2, Jhuma Sannigrahi1, Pallavi Kushwaha1, Andrew Mackenzie1,2, and Clifford Hicks1,21Max-Planck Institute for Chemical Physics of Solids, Nöthnitzerstr. 40, Dresden, 01187, Germany — 2Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom

The ground state of Heisenberg spins interacting antiferromagnetically on a triangular lattice is 120 antiferromagnetic order. We probe the effects of anisotropic lattice distortion on this phase using the material PdCrO2, which has highly-conducting Pd sheets that alternate with Mott-insulating CrO2 layers. The Cr spins order into a 120 phase at TN = 39 K. The conductivity of the Pd sheets can be measured to probe magnetic scattering across the transition. In the unstrained lattice, the resistivity has a sharp first-order-like step at TN. It persists with almost no change up to a compression of ∼ 0.2%, then broadens dramatically. This feature suggests a rigidity of the 120 phase at T ∼ TN against small perturbations, which we discuss in terms of magnetoelastic coupling and fluctuation effects.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2017 > Dresden