Spin excitations in the two-dimensional strongly coupled dimer system malachite - Archive ouverte HAL
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2015

Spin excitations in the two-dimensional strongly coupled dimer system malachite

Abstract

The mineral malachite, Cu-2(OD)(2)CO3, has a quantum spin-liquid ground state and no long-range magnetic order down to at least T = 0.4 K. Inelastic neutron scattering measurements show that the excitation spectrum consists of dispersive gapped singlet-triplet excitations, characteristic of spin-1/2 dimer-forming Heisenberg antiferromagnets. We identify a distinct two-dimensional dimerized coupling scheme with strong interdimer coupling J'/J(1) approximate to 0.3 that places malachite between strongly coupled alternating chains, square lattice antiferromagnets, and infinite-legged ladders. The geometry of the interaction scheme resembles the staggered dimer lattice, which may allow unconventional quantum criticality.

Dates and versions

hal-01588139 , version 1 (15-09-2017)

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Cite

Emmanuel Canevet, Bjorn Fak, R. K. Kremer, J. H. Chun, M. Enderle, et al.. Spin excitations in the two-dimensional strongly coupled dimer system malachite. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 91 (6), pp.060402. ⟨10.1103/PhysRevB.91.060402⟩. ⟨hal-01588139⟩
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