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Magnetic inhomogeneity on a triangular lattice: the magnetic-exchange versus the elastic energy and the role of disorder.

Abstract：

:Inhomogeneity in the ground state is an intriguing, emergent phenomenon in magnetism. Recently, it has been observed in the magnetostructural channel of the geometrically frustrated α-NaMnO2, for the first time in the absence of active charge degrees of freedom. Here we report an in-depth numerical and local-probe experimental study of the isostructural sister compound CuMnO2 that emphasizes and provides an explanation for the crucial differences between the two systems. The experimentally verified, much more homogeneous, ground state of the stoichiometric CuMnO2 is attributed to the reduced magnetoelastic competition between the counteracting magnetic-exchange and elastic-energy contributions. The comparison of the two systems additionally highlights the role of disorder and allows the understanding of the puzzling phenomenon of phase separation in uniform antiferromagnets.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zorko A,Kokalj J,Komelj M,Adamopoulos O,Luetkens H,Arčon D,Lappas A

doi

10.1038/srep09272

subject

Has Abstract

pub_date

2015-03-19 00:00:00

pages

9272

issn

2045-2322

pii

srep09272

journal_volume

5

pub_type

杂志文章

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