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  Magnetic anisotropy in the frustrated spin-chain compound β-TeVO4

Weickert, F., Harrison, N., Scott, B. L., Jaime, M., Leitmae, A., Heinmaa, I., et al. (2016). Magnetic anisotropy in the frustrated spin-chain compound β-TeVO4. Physical Review B, 94(6): 064403, pp. 1-12. doi:10.1103/PhysRevB.94.064403.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-5575-A Version Permalink: http://hdl.handle.net/21.11116/0000-0000-FF0D-4
Genre: Journal Article

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 Creators:
Weickert, F.1, Author
Harrison, N.1, Author
Scott, B. L.1, Author
Jaime, M.1, Author
Leitmae, A.1, Author
Heinmaa, I.1, Author
Stern, R.1, Author
Janson, O.2, Author              
Berger, H.1, Author
Rosner, H.2, Author              
Tsirlin, A. A.3, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              

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 Abstract: Isotropic and anisotropic magnetic behavior of the frustrated spin-chain compound beta-TeVO4 is reported. Three magnetic transitions observed in zero magnetic field are tracked in fields applied along different crystallographic directions using magnetization, heat capacity, and magnetostriction measurements. Qualitatively different temperature-field diagrams are obtained below 10 T for the field applied along a or b and along c, respectively. In contrast, a nearly isotropic high-field phase emerges above 18 T and persists up to the saturation that occurs around 22.5 T. Upon cooling in low fields, the transitions at T-N1 and T-N2 toward the spin-density-wave and stripe phases are of the second order, whereas the transition at T-N3 toward the helical state is of the first order and entails a lattice component. Our microscopic analysis identifies frustrated J(1)-J(2) spin chains with a sizable antiferromagnetic interchain coupling in the bc plane and ferromagnetic couplings along the a direction. The competition between these ferromagnetic interchain couplings and the helical order within the chain underlies the incommensurate order along the a direction, as observed experimentally. While a helical state is triggered by the competition between J(1) and J(2) within the chain, the plane of the helix is not uniquely defined because of competing magnetic anisotropies. Using high-resolution synchrotron diffraction and Te-125 nuclear magnetic resonance, we also demonstrate that the crystal structure of beta-TeVO4 does not change down to 10 K, and the orbital state of V4+ is preserved.

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Language(s): eng - English
 Dates: 2016-08-012016-08-01
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 94 (6) Sequence Number: 064403 Start / End Page: 1 - 12 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008