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Orphan spins and bound in-gap states in the $S={5\over2}$ antiferromagnet CaFe$_{2}$O$_{4}$
| العنوان: | Orphan spins and bound in-gap states in the $S={5\over2}$ antiferromagnet CaFe$_{2}$O$_{4}$ |
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| المؤلفون: | Stock, C., Rodriguez, E. E., Lee, N., Demmel, F., Fouquet, P., Laver, M., Niedermayer, Ch., Su, Y., Nemkovski, K., Green, M A., Rodriguez-Rivera, J. A., Kim, J. W., Zhang, L., Cheong, S. -W. |
| المصدر: | Phys. Rev. Lett. 119, 257204 (2017) |
| سنة النشر: | 2017 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | CaFe$_{2}$O$_{4}$ is an anisotropic $S={5\over 2}$ antiferromagnet with two competing $A$ ($\uparrow \uparrow \downarrow \downarrow$) and $B$ ($\uparrow \downarrow \uparrow \downarrow$) magnetic order parameters separated by static antiphase boundaries at low temperatures. Neutron diffraction and bulk susceptibility measurements, show that the spins near these boundaries are weakly correlated and a carry an uncompensated ferromagnetic moment that can be tuned with a magnetic field. Spectroscopic measurements find these spins are bound with excitation energies less than the bulk magnetic spin-waves and resemble the spectra from isolated spin-clusters. Localized bound orphaned spins separate the two competing magnetic order parameters in CaFe$_{2}$O$_{4}$. Comment: (main text - 5 pages, 4 figures; supplementary information - 4 pages, 6 figures, to be published in Physical Review Letters). arXiv admin note: text overlap with arXiv:1606.04243 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.119.257204 |
| URL الوصول: | http://arxiv.org/abs/1712.02853 |
| رقم الانضمام: | edsarx.1712.02853 |
| قاعدة البيانات: | arXiv |
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