Spin correlations in the extended kagome system YBaCo3FeO7

Abstract

The transition metal based oxide YBaCo3FeO7 is structurally related to the mineral Swedenborgite SbNaBe4O7, a polar non-centrosymmetric 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, Mössbauer 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 (~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 ~50 K, the onset of a hyperfine field shows the development of moments static on the Mössbauer 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 in below ~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.

13 pages, 7 figures

References in corpus (6)

• Dirac Strings and Magnetic Monopoles in Spin Ice Dy2Ti2O7
• Competing magnetic interactions in the extended Kagome system YBaCo4O7
• Electronic and magnetic properties of the kagome systems YBaCo4O7 and YBaCo3MO7 (M=Al, Fe)
• Magnetic Structure of YBaCo4O7 with Kagome- and Triangular-Lattices
• Remnant magnetization above room temperature in semiconducting Y_0.5Ca_0.5BaCo_4O_7
• Spin Correlations in the Geometrically Frustrated RBaCo4O7 Antiferromagnets: Mean-Field Approach and Monte-Carlo Simulations

Cited by in corpus (6)

• Spin-lattice and magnetoelectric couplings enhanced by orbital degrees of freedom in polar magnets
• Neutron diffraction study and theoretical analysis of the antiferromagnetic order and diffuse scattering in the layered Kagome system CaBaCo${}_2$Fe${}_2$O${}_7$
• Spin-liquid phase and order-by-disorder of classical Heisenberg spins on the swedenborgite lattice
• A possible chiral spin-liquid phase in non-centrosymmetric $R$BaCo${}_4$O${}_7$
• Structural, magnetic and electric polarization properties of geometrically frustrated YBaCo4O7 and DyBaCo4O7 cobaltites
• Controlling structural distortion in the geometrically frustrated layered cobaltate YBaCo4O7+δ by Fe substitution and its role on magnetic correlations