Nanoscale degeneracy lifting in a geometrically frustrated antiferromagnet

Frandsen, Benjamin A.; Bozin, Emil S.; Aza, Eleni; Martinez, Antonio Fernández; Feygenson, Mikhail; Page, Katherine; Lappas, Alexandros

doi:10.1103/physrevb.101.024423

Title: Nanoscale degeneracy lifting in a geometrically frustrated antiferromagnet

Journal Article · 26 January 2020 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.101.024423 · OSTI ID:1593249

^[1];

^[2]; Aza, Eleni ^[3]; Martinez, Antonio Fernández ^[4]; Feygenson, Mikhail ^[5]; Page, Katherine ^[6];

^[4]

Brigham Young Univ., Provo, UT (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Foundation for Research and Technology-Hellas, Vassilika Vouton, Heraklion (Greece); Univ. of Ioannina, Ioannina (Greece)
Foundation for Research and Technology-Hellas, Vassilika Vouton, Heraklion (Greece)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Forschungszentrum Jülich, Jülich (Germany). Jülich Centre of Neutron Science
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

The local atomic and magnetic structures of the compounds A MnO₂ (A = Na, Cu), which realize a geometrically frustrated, spatially anisotropic triangular lattice of Mn spins, have been investigated by atomic and magnetic pair distribution function analysis of neutron total scattering data. Relief of frustration in CuMnO₂ is accompanied by a conventional cooperative symmetry-lowering lattice distortion driven by Néel order. In NaMnO₂, however, the distortion has a short-range nature. A cooperative interaction between the locally broken symmetry and short-range magnetic correlations lifts the magnetic degeneracy on a nanometer length scale, enabling long-range magnetic order in the Na derivative. The degree of frustration, mediated by residual disorder, contributes to the rather differing pathways to a single, stable magnetic ground state in these two related compounds. This study demonstrates how nanoscale structural distortions that cause local-scale perturbations can lift the ground-state degeneracy and trigger macroscopic magnetic order.

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

Sponsoring Organization:: Fulbright Foundation-Greece; Science and Technology Facilities Council (STFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0012704

OSTI ID:: 1593249

Report Number(s):: BNL-213567-2020-JAAM

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 101; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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