Universität zu Köln

Valldor, Martin, Hermann, Raphael P., Wuttke, Joachim ORCID: 0000-0002-4028-1447, Zamponi, Michaela and Schweika, Werner (2011). Spin correlations in the extended kagome system YBaCo3FeO7. Phys. Rev. B, 84 (22). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1098-0121

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Abstract

The transition metal-based oxide YBaCo3FeO7 is structurally related to the mineral Swedenborgite SbNaBe4O7, a polar noncentrosymmetric crystal system. The magnetic Co3Fe sublattice consists of a tetrahedral network containing kagome-like layers with trigonal interlayer sites. This geometry causes frustration effects for magnetic ordering, which were investigated by magnetization measurements, Mossbauer spectroscopy, polarized neutron diffraction, and neutron spectroscopy. Magnetization measurement and neutron diffraction do not show long range ordering even at low temperature (1 K), although a strong antiferromagnetic coupling (similar to 2000 K) is deduced from the magnetic susceptibility. Below 590 K we observe two features, a spontaneous weak anisotropic magnetization hysteresis along the polar crystallographic axis and a hyperfine field on the Fe kagome sites, whereas the Fe spins on the interlayer sites remain idle. Below similar to 50 K the onset of a hyperfine field shows the development of moments static on the Mossbauer time scale also for the Fe interlayer sites. Simultaneously, an increase of spin correlations is found by polarized neutron diffraction. The relaxation part of the dynamic response has been further investigated by high-resolution neutron spectroscopy, which reveals that the spin correlations start to freeze below similar to 50 K. Monte Carlo simulations show that the neutron scattering results at lower temperatures are compatible with a recent proposal that the particular geometric frustration in the Swedenborgite structure promotes quasi-one-dimensional partial order.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Valldor, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Hermann, Raphael P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wuttke, Joachim UNSPECIFIED orcid.org/0000-0002-4028-1447 UNSPECIFIED Zamponi, Michaela UNSPECIFIED UNSPECIFIED UNSPECIFIED Schweika, Werner UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-483296
DOI:	10.1103/PhysRevB.84.224426
Journal or Publication Title:	Phys. Rev. B
Volume:	84
Number:	22
Date:	2011
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1098-0121
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WEAK FERROMAGNETISM; MAGNETIC MONOPOLES; ANTIFERROMAGNET; ICE; SCATTERING; YBACO4O7; BEHAVIOR; LATTICE; ORDER Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48329