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MA: Fachverband Magnetismus
MA 59: Posters Magnetism III
MA 59.46: Poster
Freitag, 20. März 2020, 09:00–12:00, P2/EG
Quantum criticality in α-RuCl3 investigated by means of dilatometry — •Vilmos Kocsis1, Anja U.B. Wolter1, Sebastian Gass1, Laura T. Corredor1, Pedro M. Consoli2,3, Lukas Janssen2, Matthias Vojta2, Paula L. Kelley4,5, Stephen Nagler6, David G. Mandrus4,5, and Bernd Büchner1,7 — 1Institute for Solid State and Materials Research, Leibniz IFW Dresden, Germany — 2Institute for Theoretical Physics, Technical University Dresden, Germany — 3Instituto de Física de Sao Carlos, Universidade de Sao Paulo, Sao Carlos, Brazil — 4Materials Science and Engineering Department, University of Tennessee, USA — 5Materials Science and Technology Division, Oak Ridge National Laboratory, USA — 6Neutron Scattering Division, Oak Ridge National Laboratory, USA — 7Institute of Solid State and Materials Physics, Technical University Dresden, Germany
When the antiferromagnetic zigzag phase is suppressed, field-induced quantum criticality was found around Bc 7-8T in the quantum spin liquid candidate α-RuCl3 [1]. We present high-resolution thermal expansion α, magnetostriction λ, and specific-heat (Cp) measurements on α-RuCl3. The extracted Grüneisen parameter Γ= α/Cp shows divergence as typical for quantum critical behavior. Our thermodynamic experiments further hint at the existence of a third low-temperature phase in the examined field range in general agreement with former magnetocaloric and neutron diffraction measurements [2]. [1] A. U. B. Wolter et. al., PRB 96, 041405(R) (2017) [2] Christian Balz et al., Phys. Rev. B 100, 060405(R) (2019).