Extraordinary Magnetic Response of an Anisotropic 2D Antiferromagnet via Site Dilution

Yang, Junyi; Suwa, Hidemaro; Meyers, Derek; Zhang, Han; Horak, Lukas; Zhang, Zhan; Karapetrova, Evguenia; Kim, Jong-Woo; Ryan, Philip J.; Dean, Mark P. M.; Hao, Lin; Liu, Jian

doi:10.1021/acs.nanolett.3c02470

Extraordinary Magnetic Response of an Anisotropic 2D Antiferromagnet via Site Dilution

Journal Article · Thu Dec 14 00:00:00 EST 2023 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.3c02470· OSTI ID:2222384

^[1]; ^[2]; Meyers, Derek ^[3]; Zhang, Han ^[4]; Horak, Lukas ^[5]; Zhang, Zhan ^[6]; Karapetrova, Evguenia ^[6]; Kim, Jong-Woo ^[6]; Ryan, Philip J. ^[7]; ^[8]; Hao, Lin ^[9]; Liu, Jian ^[4]

University of Tennessee, Knoxville, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
University of Tokyo (Japan)
Brookhaven National Laboratory (BNL), Upton, NY (United States); Oklahoma State University, Stillwater, OK (United States)
University of Tennessee, Knoxville, TN (United States)
Charles University, Prague (Czech Republic)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States); Dublin City University (Ireland)
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Chinese Academy of Sciences, Anhui (China)

A prominent characteristic of 2D magnetic systems is the enhanced spin fluctuations, which reduce the ordering temperature. We report that a magnetic field of only 1000th of the Heisenberg superexchange interaction can induce a crossover, which for practical purposes is the effective ordering transition, at temperatures about 6 times the Néel transition in a site-diluted two-dimensional anisotropic quantum antiferromagnet. Such a strong magnetic response is enabled because the system directly enters the antiferromagnetically ordered state from the isotropic disordered state, skipping the intermediate anisotropic stage. The underlying mechanism is achieved on a pseudospin-half square lattice realized in the [(SrIrO3)1/(SrTiO3)2] superlattice thin film that is designed to linearly couple the staggered magnetization to external magnetic fields by virtue of the rotational symmetry-preserving Dzyaloshinskii–Moriya interaction. Furthermore, our model analysis shows that the skipping of the anisotropic regime despite finite anisotropy is due to the enhanced isotropic fluctuations under moderate dilution.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: Basic Research Program of the Chinese Academy of Sciences Based on Major Scientific Infrastructures; Grant Agency of the Czech Republic; JSPS KAKENHI; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-06CH11357; SC0012704

OSTI ID:: 2222384

Report Number(s):: BNL--225028-2023-JAAM

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 24 Vol. 23; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
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Extraordinary Magnetic Response of an Anisotropic 2D Antiferromagnet via Site Dilution

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