Structural, magnetic and electric polarization properties of geometrically frustrated YBaCo4O7 and DyBaCo4O7 cobaltites

Abstract

In RBaCo4O7 (R = Ca, Y and Rare earth) cobaltite family, only CaBaCo4O7 shows 3D long range ferrimagnetic and spin driven electric polarization properties. In the present study, we have investigated the structural, magnetic and electric polarization properties in YBaCo4O7 and DyBaCo4O7 members of this family and the obtained results are compared with the CaBaCo4O7. The compound YBaCo4O7 showed a series of magnetic transitions in agreement with reported literature, additionally, a cluster glass behavior below 5 K is observed. Powder neutron diffraction studies on DyBaCo4O7 cobaltite showed an orthorhombic Pbn21 symmetry and signature of short-range 120 degree magnetic correlations of kagome layer and a spin glass behavior below 65 K. Dielectric measurements on both the samples showed strong frequency dispersion at high temperature and frequency independent behavior at low temperature without dielectric anomaly. Pyroelectric current measurement has showed a broad peak around 50 K in both the samples; however, a careful analysis relates the peak to thermally stimulated depolarization current. This study signifies that the giant structural distortions and cobalt charge ordering at kagome layer are the key factors to drive both long range magnetic ordering and spin driven electric polarization in this cobaltite family.

arXiv commentaccepted in EPL

References in corpus (21)

• Ising-like Spin Anisotropy and Competing Antiferromagnetic - Ferromagnetic Orders in GdBaCo_{2}O_{5.5} Single Crystals
• Competing magnetic interactions in the extended Kagome system YBaCo4O7
• Magnetic Structure of CaBaCo4O7: Lifting of Geometrical Frustration towards Ferrimagnetism
• Gigantic magnetic field polarization and magnetoelectric coupling in a ferrimagnetic oxide CaBaCo4O7
• Magnetic correlations in YBaCo4O7 probed by single-crystal neutron scattering
• Approaching the ground state of the kagome antiferromagnet
• Magnetic Structure of YBaCo4O7 with Kagome- and Triangular-Lattices
• CaBaCo${}_4$O${}_7$ : A ferrimagnetic pyroelectric
• Reentrant cluster glass behavior in La2CoMnO6 nanoparticles
• Spin-ordering and magnetoelastic coupling in the extended Kagome system YBaCo4O7
• Direct evidence for charge stripes in a layered cobalt oxide
• Identification of a Griffiths singularity in a geometrically frustrated antiferromagnet
• Unidirectional terahertz light absorption in the pyroelectric ferrimagnet CaBaCo4O7
• Excess-Hole Induced High Temperature Polarized State and its Correlation with the Multiferroicity in Single Crystalline DyMnO3
• Spin dynamics, short range order and spin freezing in Y0.5Ca0.5BaCo4O7
• Competing Exchange Interactions in the Multiferroic and Ferrimagnetic CaBaCo${}_4$O${}_7$
• Short-range Magnetic Ordering in the Geometrically Frustrated Layered Compound YBaCo4O7 with an Extended Kagomé Structure
• Spin correlations in the extended kagome system YBaCo3FeO7
• Switching from pyroelectric to ferroelectric order in Ni doped CaBaCo4O7
• Terahertz frequency magnetoelectric effect in Ni doped CaBaCo${}_4$O${}_7$
• Spin-liquid phase and order-by-disorder of classical Heisenberg spins on the swedenborgite lattice

Cited by in corpus (2)

• New Gd-based magnetic compound GdPt${}_2$B with a chiral crystal structure
• Coexistence of magnetic and dielectric glassy states in alternating kagome and triangular lattice LuBaCo${}_4$O${}_7$ cobaltite