Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Correlated Electrons: Quantum-Critical Phenomena - Experiment
TT 28.1: Vortrag
Dienstag, 8. März 2016, 10:00–10:15, H21
Quantum multicriticality in Sr3Ru2O7 — •Dan Sun1, Andreas Rost2, Robin Perry3, Manuel Brando1, and Andrew Mackenzie1,4 — 1Max-Planck Institute for Chemical Physics of Solids, Noethnitzerstr. 40, Dresden, 01187, Germany — 2Max-Planck Institute for Solid State Research, Heisenbergstraße 1, Stuttgart, 70569, Germany — 3University College London, Gower Street, London, WC1E 6BT, United Kingdom — 4Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, United Kingdom
The low temperature phase diagram of the layered perovskite metal Sr3Ru2O7 is of considerable interest because of the interplay between phase formation and quantum criticality [1,2]. We have performed high resolution specific heat and magnetocaloric measurements down to temperatures as low as 65 mK, uncovering evidence that a feature at 7.5 T previously thought to be a crossover is a quantum critical point resulting from the suppression towards T=0 of an extremely low energy scale. Additionally, we report for the first time the observation of thermodynamic signatures associated with the appearance of incommensurate magnetic order recently reported in neutron scattering measurements [3].
[1] S. Grigera et al. Science 306, 1154 (2004)
[2] R. Borzi et al. Science 315, 214 (2007)
[3] C. Lester et al. Nature Materials 14, 373 (2015)