Universität zu Köln

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

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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
Creators:	Creators Email ORCID ORCID Put Code Qureshi, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ressouche, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mukhin, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ivanov, V. Yu UNSPECIFIED UNSPECIFIED UNSPECIFIED Barilo, S. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shiryaev, S. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Skumryev, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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
Uncontrolled Keywords:	Keywords Language COBALT Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47192