DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2018 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 41: Frustrated Magnets - Spin Liquids - Experiments

TT 41.9: Talk

Tuesday, March 13, 2018, 12:30–12:45, H 3005

Exploration of the quantum spin liquid state in Ca10Cr7O28Christian Balz1,2, •Bella Lake1,3, ATM Nazmul Islam1, Ulrich Tutsch4, Michael Lang4, Yuji Matsuda5, Lars Opherden6,7, Thomas Herrmannsdoefer6, and Jose A. Rodriguez-Rivera81Helmholtz Zentrum Berlin, Germany — 2Oak Ridge National Lab, USA — 3Technical University Berlin, Germany — 4Goethe University, Germany — 5Kyoto University, Japan — 6Helmholtz Zentrum Dresden Rossendorf, Germany — 7Technical University Dresden, Germany — 8NIST, MD, USA

Ca10Cr7O28 is a new candidate spin liquid where the magnetic Cr5+ ions (S-1/2) form breathing Kagome bilayers. Both kagome layers consist of alternating ferromagnetic/antiferromagnetic corner-sharing triangles and the two layers are stacked so that the ferromagnetic triangles lie on top of antiferromagnetic triangles and vice versa. Previous measurements revealed the absence of long-range magnetic order and the presence of persistent spin dynamics in the ground state. Here we present a detailed exploration of the ground state and excitations using magnetisation, heat capacity, thermal conductivity and inelastic neutron scattering. The heat capacity and thermal conductivity are linear in temperature suggesting the presence of a gapless spinon Fermi surface while the excitations are diffuse revealing the presence of spinon continuua. The excitations appear gapless and form a distinct pattern that evolves gradually with energy. Together these results provide strong evidence that Ca10Cr7O28 is a gapless quantum spin liquid. The origins of this spin liquid state will be discussed.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2018 > Berlin