Spin Density Wave versus Fractional Magnetization Plateau in a Triangular Antiferromagnet
L. Facheris, K. Yu. Povarov, S. D. Nabi, D. G. Mazzone, Jakob Lass, B. Roessli, E. Ressouche, Z. Yan, S. N. Gvasaliya, A. Zheludev
Abstract
We report an excellent realization of the highly nonclassical incommensurate spin-density wave (SDW) state in the quantum frustrated antiferromagnetic insulator Cs_{2}CoBr_{4}. In contrast to the well-known Ising spin chain case, here the SDW is stabilized by virtue of competing planar in-chain anisotropies and frustrated interchain exchange. Adjacent to the SDW phase is a broad m=1/3 magnetization plateau that can be seen as a commensurate locking of the SDW state into the up-up-down (UUD) spin structure. This represents the first example of the long-sought SDW-UUD transition in triangular-type quantum magnets.
Topics & Concepts
Condensed matter physicsAntiferromagnetismMagnetizationPlateau (mathematics)PhysicsSpin waveSpin (aerodynamics)FerromagnetismQuantum mechanicsMagnetic fieldMathematicsMathematical analysisThermodynamicsAdvanced Condensed Matter PhysicsPhysics of Superconductivity and MagnetismMagnetic and transport properties of perovskites and related materials