Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session S51: Kagome & Shastry-Sutherland Systems
8:00 AM–11:00 AM,
Thursday, March 17, 2022
Room: McCormick Place W-474B
Sponsoring
Units:
GMAG DMP
Chair: Peter Armitage, Johns Hopikns Univ.
Abstract: S51.00008 : Magnetism in a distorted kagome lattice: the case of Y-kapellasite*
9:48 AM–10:00 AM
Presenter:
Aleksandar Razpopov
(Goethe University Frankfurt)
Authors:
Aleksandar Razpopov
(Goethe University Frankfurt)
Max Hering
(Free University of Berlin)
Francesco Ferarri
(Goethe University Frankfurt)
Igor Mazin
(George Mason University)
Roser Valenti
(Goethe University Frankfurt)
Harald O Jeschke
(Okayama Univ)
Johannes Reuther
(Free University of Berlin)
Here we focus on an unexplored distorted spin-1/2 kagome lattice with three symmetry-inequivalent nearest-neighbor AFM Heisenberg couplings. The recently synthesized Y-kapellasite Y3Cu9(OH)19Cl8 is a realization of such a distorted lattice. First, we analyse the classical magnetic phase diagram using analytical arguments and numerical methods, and find a rich classical phase diagram with a Q=0 magnetic phase, Q=(1/3,1/3) non-collinear coplanar magnetic phases and a classical spin liquid regime. In a second step we estimate the effective magnetic Heisenberg Hamiltonian by total-energy mapping analysis within the FPLO framework. Using the extracted Heisenberg Hamiltonian we predict Y-kapellasite to be localized in the Q=(1/3,1/3) phase which is stable after inclusion of quantum effects.
*Funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within the SFB/transregio 288 "Elastic Tuning and Response of Electronic Quantum Phases of Matter" (ELASTO-Q-MAT), project A05 "Interplay of lattice, charge and spin degrees of freedom from first principles" is gratefully acknowledged.
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