Prefer a chat interface with context about you and your work?
Spin fluctuations with two-dimensional XY behavior in a frustrated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:math>square-lattice ferromagnet
The spin dynamics of the layered square-lattice vanadate Pb${}_{2}$VO(PO${}_{4}$)${}_{2}$ is investigated by electron spin resonance (ESR) at various magnetic fields and at temperatures above magnetic ordering. The linewidth divergence towards low temperatures seems to agree with isotropic Heisenberg-type spin exchange suggesting that the spin relaxation in this quasi-two-dimensional compound is …