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000840399 1001_ $$0P:(DE-HGF)0$$aTymoshenko, Y. V.$$b0
000840399 245__ $$aPseudo-Goldstone Magnons in the Frustrated S=3=2 Heisenberg Helimagnet ZnCr2Se4with a Pyrochlore Magnetic Sublattice
000840399 260__ $$aCollege Park, Md.$$bAPS$$c2017
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000840399 520__ $$aLow-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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000840399 65027 $$0V:(DE-MLZ)SciArea-170$$2V:(DE-HGF)$$aMagnetism$$x0
000840399 65017 $$0V:(DE-MLZ)GC-2004-2016$$2V:(DE-HGF)$$aBasic research$$x0
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000840399 7001_ $$0P:(DE-HGF)0$$aOnykiienko, Y. A.$$b1
000840399 7001_ $$0P:(DE-HGF)0$$aMüller, T.$$b2
000840399 7001_ $$0P:(DE-HGF)0$$aThomale, R.$$b3
000840399 7001_ $$0P:(DE-HGF)0$$aRachel, S.$$b4
000840399 7001_ $$0P:(DE-HGF)0$$aCameron, A. S.$$b5
000840399 7001_ $$0P:(DE-HGF)0$$aPortnichenko, P. Y.$$b6
000840399 7001_ $$0P:(DE-HGF)0$$aEfremov, D. V.$$b7
000840399 7001_ $$0P:(DE-HGF)0$$aTsurkan, V.$$b8
000840399 7001_ $$0P:(DE-HGF)0$$aAbernathy, D. L.$$b9
000840399 7001_ $$0P:(DE-HGF)0$$aOllivier, J.$$b10
000840399 7001_ $$0P:(DE-Juel1)156579$$aSchneidewind, Astrid$$b11$$ufzj
000840399 7001_ $$0P:(DE-HGF)0$$aPiovano, A.$$b12
000840399 7001_ $$0P:(DE-HGF)0$$aFelea, V.$$b13
000840399 7001_ $$0P:(DE-HGF)0$$aLoidl, A.$$b14
000840399 7001_ $$0P:(DE-HGF)0$$aInosov, D. S.$$b15$$eCorresponding author
000840399 773__ $$0PERI:(DE-600)2622565-7$$a10.1103/PhysRevX.7.041049$$p041049$$tPhysical review / X$$v7$$x2160-3308$$y2017
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