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

E. Canévet; B. Fåk; R. K. Kremer; J. H. Chun; M. Enderle; E. E. Gordon; J. L. Bettis; M. H. Whangbo; J. W. Taylor; D. T. Adroja

doi:10.1103/PhysRevB.91.060402

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

E. Canévet, B. Fåk, R. K. Kremer, J. H. Chun, M. Enderle, E. E. Gordon, J. L. Bettis, M. H. Whangbo, J. W. Taylor, D. T. Adroja

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The mineral malachite, Cu₂(OD)₂CO₃, 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′/J1≈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.

Original language	English
Article number	060402
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	91
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.91.060402
Publication status	Published - 20 Feb 2015
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.91.060402

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title = "Spin excitations in the two-dimensional strongly coupled dimer system malachite",

abstract = "The mineral malachite, Cu2(OD)2CO3, 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′/J1≈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.",

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T1 - Spin excitations in the two-dimensional strongly coupled dimer system malachite

AU - Canévet, E.

AU - Fåk, B.

AU - Kremer, R. K.

AU - Chun, J. H.

AU - Enderle, M.

AU - Gordon, E. E.

AU - Bettis, J. L.

AU - Whangbo, M. H.

AU - Taylor, J. W.

AU - Adroja, D. T.

PY - 2015/2/20

Y1 - 2015/2/20

N2 - The mineral malachite, Cu2(OD)2CO3, 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′/J1≈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.

AB - The mineral malachite, Cu2(OD)2CO3, 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′/J1≈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.

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U2 - 10.1103/PhysRevB.91.060402

DO - 10.1103/PhysRevB.91.060402

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JO - Physical Review B - Condensed Matter and Materials Physics

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IS - 6

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

Abstract

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