T. A. Shaplygina

Spin-glass state and long-range magnetic order in Pb ( Fe 1 / 2 Nb 1 / 2 ) O 3 seen via neutron scattering and muon spin rotation

We have investigated the magnetic ground state of the multiferroic relaxor ferroelectric

Glasslike state in PbFe1/2Nb1/2O3 single crystal

\text{Pb}({\text{Fe}}_{1/2}{\text{Nb}}_{1/2}){\text{O}}_{3}

Neutron scattering study of PbMg

with

_{\mathsf{1/3}}

\ensuremath{\mu}\text{SR}

Ta

spectroscopy and neutron scattering. We find that a transition to a partially disordered phase occurs below

_{\mathsf{2/3}}

T=20\text{ }\text{K}

O

that coexists with long-range antiferromagnetic ordering. The disordered phase resembles a spin glass. No clustering of magnetic ions could be evidenced by

_{\mathsf 3}

\ensuremath{\mu}\text{SR}

and BaMg

so that the coexistence appears homogeneous in the sample.

_{\mathsf{1/3}}

Magnetic properties of PbFe1/2Nb1/2O3 single crystal showed onset of glasslike behavior at 120 K, saturation of onset at 28 K, and freezing of glasslike state at 27.6 K. Zero field cooled (ZFC) and field cooled magnetization curves displayed sharp cusp in ZFC. Almeida and Toulouse line illustrated stability over 1000 Oe with unstable onset for low field. Magnetic hysteresis was observed below glasslike freezing temperature having steplike behavior and low coercive field ∼296 Oe, which may be due to chemical inhomogeneity, strong anisotropy, and weak dipole interaction.