Qureshi, N., Ressouche, E., Mukhin, A. A., Ivanov, V. Yu, Barilo, S. N., Shiryaev, S. V. and Skumryev, V. (2013). Stabilization of multiferroic spin cycloid in Ni3V2O8 by light Co doping. Phys. Rev. B, 88 (17). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969
Full text not available from this repository.Abstract
We present macroscopic and neutron diffraction data on multiferroic lightly Co-doped Ni3V2O8. Doping Co into the parent compound suppresses the sequence of four magnetic phase transitions, and only two magnetically ordered phases-the paraelectric high-temperature incommensurate (HTI) phase and the ferroelectric lowtemperature incommensurate (LTI) phase-can be observed. Interestingly, the LTI multiferroic phase with a spiral (cycloidal) magnetic structure is stabilized down to at least 1.8 K, which could be revealed by measurements of the electric polarization and confirmed by neutron diffraction on single-crystal samples. The extracted magnetic moments of the LTI phase contain, besides the main exchange, also fine components of the cycloid allowed by symmetry, which result in a small amplitude variation of the magnetic moments along the cycloid propagation due to the site-dependent symmetry properties of the mixed representations. In the HTI phase, a finite imaginary part of the spine magnetic moment could be deduced yielding a spin cycloid instead of a purely sinusoidal structure with an opposite spin chirality for different spine spin chains. The magnetic ordering of the cross-tie sites in both phases is different in comparison to the respective ones in the pure Ni compound. A wider temperature stability range of the HTI phase has been observed in comparison to Ni3V2O8, which can be explained by an additional single-ion easy-axis anisotropy due to Co doping. The larger incommensurability of the Co-doped compounds yields a larger ratio between the competing next-nearest-neighbor and nearest-neighbor interaction, which is J(2)/J(1) = 0.43 (0.47) for a doping level of 7% (10%) Co compared to 0.39 in the parent compound.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||
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URN: | urn:nbn:de:hbz:38-471925 | ||||||||||||||||||||||||||||||||
DOI: | 10.1103/PhysRevB.88.174412 | ||||||||||||||||||||||||||||||||
Journal or Publication Title: | Phys. Rev. B | ||||||||||||||||||||||||||||||||
Volume: | 88 | ||||||||||||||||||||||||||||||||
Number: | 17 | ||||||||||||||||||||||||||||||||
Date: | 2013 | ||||||||||||||||||||||||||||||||
Publisher: | AMER PHYSICAL SOC | ||||||||||||||||||||||||||||||||
Place of Publication: | COLLEGE PK | ||||||||||||||||||||||||||||||||
ISSN: | 2469-9969 | ||||||||||||||||||||||||||||||||
Language: | English | ||||||||||||||||||||||||||||||||
Faculty: | Unspecified | ||||||||||||||||||||||||||||||||
Divisions: | Unspecified | ||||||||||||||||||||||||||||||||
Subjects: | no entry | ||||||||||||||||||||||||||||||||
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URI: | http://kups.ub.uni-koeln.de/id/eprint/47192 |
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