Journal
SCIENTIFIC REPORTS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-017-04752-z
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Funding
- Deutsche Forschungsgemeinschaft via the Transregional Collaborative Research Center (Augsburg/Munich/Stuttgart) [TRR 80]
- Furstlich und Graflich Fuggersche Stiftung
- BMBF via ENREKON [03EK3015]
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Spin spirals, which coexist with collinear spin order in linarite PbCuSO4(OH)(2), indicate electrical polarisation textures of spin-multipolar phases. We derive experimental evidence by a detailed investigation of the magnetic-field dependent dielectric and electric polarization properties at low temperatures. Linarite exhibits a quasi-one-dimensional frustrated S = 1/2 spin chain, which forms 3D spin-spiral order in zero magnetic field for T < 2.85 K. Recently, due to the monoclinic lattice of linarite with CuO2 ribbon chains, complex magnetic field induced states were found. These spin-multipolar phases, which compete with spin-density waves at low magnetic fields, exist in close vicinity to the transition from the spin spiral into field induced spin polarized state. Via antisymmetric DzyaloshinskiiMoriya interaction spin-driven ferroelectricity develops in the spin-spirals state. Via electric polarization measurements this allows to prove the transitions into complex magnetic field induced phases. Thorough analyses of the temperature and magnetic field dependent dielectric properties of a naturally grown single crystalline sample provide a detailed (T, H) phase diagrams for the three different crystallographic directions.
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