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| 001 | 840399 | ||
| 005 | 20210129231828.0 | ||
| 024 | 7 | _ | |2 doi |a 10.1103/PhysRevX.7.041049 |
| 024 | 7 | _ | |2 Handle |a 2128/16127 |
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| 037 | _ | _ | |a FZJ-2017-07932 |
| 082 | _ | _ | |a 530 |
| 100 | 1 | _ | |0 P:(DE-HGF)0 |a Tymoshenko, Y. V. |b 0 |
| 245 | _ | _ | |a Pseudo-Goldstone Magnons in the Frustrated S=3=2 Heisenberg Helimagnet ZnCr2Se4with a Pyrochlore Magnetic Sublattice |
| 260 | _ | _ | |a College Park, Md. |b APS |c 2017 |
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| 520 | _ | _ | |a Low-energy spin excitations in any long-range ordered magnetic system in the absence of magnetocrystallineanisotropy are gapless Goldstone modes emanating from the ordering wave vectors. Inhelimagnets, these modes hybridize into the so-called helimagnon excitations. Here we employ neutronspectroscopy supported by theoretical calculations to investigate the magnetic excitation spectrum of theisotropic Heisenberg helimagnet ZnCr2Se4 with a cubic spinel structure, in which spin-3=2 magnetic Cr3þions are arranged in a geometrically frustrated pyrochlore sublattice. Apart from the conventionalGoldstone mode emanating from the ð0 0 qhÞ ordering vector, low-energy magnetic excitations in thesingle-domain proper-screw spiral phase show soft helimagnon modes with a small energy gap of∼0.17 meV, emerging from two orthogonal wave vectors ðqh 00Þ and ð0 qh 0Þ where no magnetic Braggpeaks are present. We term them pseudo-Goldstone magnons, as they appear gapless within linear spinwavetheory and only acquire a finite gap due to higher-order quantum-fluctuation corrections. Our resultsare likely universal for a broad class of symmetric helimagnets, opening up a new way of studying weakmagnon-magnon interactions with accessible spectroscopic methods. |
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| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Onykiienko, Y. A. |b 1 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Müller, T. |b 2 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Thomale, R. |b 3 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Rachel, S. |b 4 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Cameron, A. S. |b 5 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Portnichenko, P. Y. |b 6 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Efremov, D. V. |b 7 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Tsurkan, V. |b 8 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Abernathy, D. L. |b 9 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Ollivier, J. |b 10 |
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| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Felea, V. |b 13 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Loidl, A. |b 14 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Inosov, D. S. |b 15 |e Corresponding author |
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