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Frustrated Heisenberg J1–J2 Model within the Stretched Diamond Lattice of LiYbO2



Mitchell M. Bordelon, Chunxiao Liu, Lorenzo Posthuma, Eric Kenney, M. J. Graf, Nicholas Butch, Arnab Banerjee, Stuart Calder, Leon Balents, Stephen Wilson


We investigate the magnetic properties of LiYbO2, containing a three-dimensionally frustrated, diamondlike lattice via neutron scattering, magnetization, and heat capacity measurements. The stretched diamond network of Yb3+ ions in LiYbO2 enters a long-range incommensurate, helical state with an ordering wave vector k = (0.384, plus or minus} 0.384, 0) that "locks-in" to a commensurate k = (1/3, plus or minus} 1/3, 0) phase under the application of a magnetic field. The spiral magnetic ground state of LiYbO2 can be understood in the framework of a Heisenberg J1–J2 Hamiltonian on a stretched diamond lattice, where the propagation vector of the spiral is uniquely determined by the ratio of J2/|J1|. The pure Heisenberg model, however, fails to account for the relative phasing between the Yb moments on the two sites of the bipartite lattice, and this detail as well as the presence of an intermediate, partially disordered, magnetic state below 1 K suggests interactions beyond the classical Heisenberg description of this material.
Physical Review B


magnetic frustration, helimagnet


Bordelon, M. , Liu, C. , Posthuma, L. , Kenney, E. , Graf, M. , Butch, N. , Banerjee, A. , Calder, S. , Balents, L. and Wilson, S. (2021), Frustrated Heisenberg J<sub>1</sub>&#8211;J<sub>2</sub> Model within the Stretched Diamond Lattice of LiYbO<sub>2</sub>, Physical Review B (Accessed April 18, 2024)
Created January 13, 2021, Updated August 30, 2021