期刊
PHYSICAL REVIEW B
卷 81, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.184409
关键词
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资金
- DFG [SFB 463]
- Hungarian OTKA [T049607, K62280]
- MEXT, Japan [16GS50219, 17740244, 19052008]
- EPSRC [EP/C539974/1, EP/G031460/1]
- EPSRC [EP/G031460/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G031460/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [17740244] Funding Source: KAKEN
The classical bilinear-biquadratic nearest-neighbor Heisenberg antiferromagnet on the pyrochlore lattice does not exhibit conventional Neel-type magnetic order at any temperature or magnetic field. Instead spin correlations decay algebraically over length scales r less than or similar to xi(c)similar to 1/root T, behavior characteristic of a Coulomb phase arising from a strong local constraint. Despite this, its thermodynamic properties remain largely unchanged if Neel order is restored by the addition of a degeneracy-lifting perturbation, e.g., further neighbor interactions. Here we show how these apparent contradictions can be resolved by a proper understanding of way in which long-range Neel order emerges out of well-formed local correlations and identify nematic and vector-multipole orders hidden in the different Coulomb phases of the model. So far as experiment is concerned, our results suggest that where long-range interactions are unimportant, the magnetic properties of Cr spinels which exhibit half-magnetization plateaux may be largely independent of the type of magnetic order present.
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