Randomness and frustration in a S= 12 square-lattice Heisenberg antiferromagnet

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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2022-05-12

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en

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7
1-7

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Physical Review B, Volume 105, issue 18

Abstract

We explore the interplay between randomness and magnetic frustration in the series of S=12 Heisenberg square-lattice compounds Sr2CuTe1-xWxO6. Substituting W for Te alters the magnetic interactions dramatically, from strongly nearest-neighbor to next-nearest-neighbor antiferromagnetic coupling. We perform neutron scattering measurements to probe the magnetic ground state and excitations over a range of x. We propose a bond-disorder model that reproduces ground states with only short-ranged spin correlations in the mixed compounds. The calculated neutron diffraction patterns and powder spectra agree well with the measured data and allow detailed predictions for future measurements. We conclude that quenched randomness plays the major role in defining the physics of Sr2CuTe1-xWxO6 with frustration being less significant.

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Funding Information: We thank E. Cussen, A. Sandvik, and O. Yazyev for helpful discussions. This work was funded by the Swiss National Science Foundation, including by its Sinergia networks MPBH (Grant Nos. CRSII2 141962/1 and CRSII2 160765/1) and Nanoskyrmionics (Grant No. 171003), by the European Research Council through the project CONQUEST (Grant No. 259602) and the Synergy network HERO (Grant No. 810451), and by the Leverhulme Trust through Research Project Grant No. RPG-2017-109 and Early Career Fellowship No. ECF-2021-170. We thank the ILL and ISIS for the allocation of beam time for this study. Data collected at both facilities are available as Refs. . Publisher Copyright: © 2022 American Physical Society.

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Fogh, E, Mustonen, O, Babkevich, P, Katukuri, V M, Walker, H C, Mangin-Thro, L, Karppinen, M, Ward, S, Normand, B & Rønnow, H M 2022, ' Randomness and frustration in a S= 12 square-lattice Heisenberg antiferromagnet ', Physical Review B, vol. 105, no. 18, 184410, pp. 1-7 . https://doi.org/10.1103/PhysRevB.105.184410