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Spin Density Wave versus Fractional Magnetization Plateau in a Triangular Antiferromagnet

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arxiv 2204.10682 v2 pith:H3HOR4Y2 submitted 2022-04-22 cond-mat.str-el

Spin Density Wave versus Fractional Magnetization Plateau in a Triangular Antiferromagnet

classification cond-mat.str-el
keywords spinfrustratedmagnetizationplateauquantumstatewaveadjacent
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

We report an excellent realization of the highly non-classical 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 long-sought SDW-UUD transition in triangular-type quantum magnets.

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