Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session G60: Poster Session I
Tuesday, March 6, 2018
LACC Room: West Hall A
Abstract: G60.00134 : Frustrated Magnetism in RE2SrAl2O7 (RE = Gd, Tb, Ho) with a 2D Edge-Sharing-Tetrahedral Lattice*
(Oak Ridge National Laboratory)
Single crystals of the refractory aluminate series RE2SrAl2O7 (RE=Gd, Tb, Ho) are grown for the first time using a laser-diode-heated floating zone method. These series belong to the Ruddlesden–Popper phase of general formula SrREnAlnO3n+1 with n=2 . The structure is a periodic stacking of a rock-salt layer and a double perovskite block where rare earth cations are arranged in two square 2D lattices lying on top of each other but shifted by (1/2, 1/2). The two square 2D lattices of the only magnetic ions in these systems, RE3+, can be viewed as a 2D edge-sharing-tetrahedral lattice with nearest-neighbour antiferromagnetic interactions resulting in a 2-in, 2-out spin structure, reminiscent of spin ice. Magnetic measurements do not show magnetic order down to 1.8 K, but the susceptibility indicates competing interactions. The question of magnetic ground state and crystalline anisotropy is further investigated by low temperature µSR and neutron scattering experiments.
 I. Zvereva, Y. Smirnov, V. Gusarov, V. Popova, and J. Choisnet, Solid State Sci. 5, 343 (2003).
*The work at Rutgers University was supported by the DOE under Grant No. DOE: DE-FG02-07ER46382.
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