[en] Typically, magnetic phenomena result from the spontaneous order of the sublattices. Here, the cross-talk of two magnetic ions gives rise to an intrinsic, yet non-spontaneous ordering and manifests as emergent strong spin-phonon coupling in SmFeO3. Many material properties such as superconductivity, magnetoresistance or magnetoelectricity emerge from the non-linear interactions of spins and lattice/phonons. Hence, an in-depth understanding of spin-phonon coupling is at the heart of these properties. While most examples deal with one magnetic lattice only, the simultaneous presence of multiple magnetic orderings yield potentially unknown properties. We demonstrate a strong spin-phonon coupling in SmFeO3 that emerges from the interaction of both, iron and samarium spins. We probe this coupling as a remarkably large shift of phonon frequencies and the appearance of new phonons. The spin-phonon coupling is absent for the magnetic ordering of iron alone but emerges with the additional ordering of the samarium spins. Intriguingly, this ordering is not spontaneous but induced by the iron magnetism. Our findings show an emergent phenomenon from the non-linear interaction by multiple orders, which do not need to occur spontaneously. This allows for a conceptually different approach in the search for yet unknown properties.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Guennou, Mael ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Evans, Donald M.; Univ Cambridge, Dept Earth Sci, Downing St, Cambridge CB2 3EQ, England.
Toulouse, Constance ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Emerging spin-phonon coupling through cross-talk of two magnetic sublattices
Publication date :
2022
Journal title :
NATURE COMMUNICATIONS
Publisher :
Nature Portfolio, Berlin, Unknown/unspecified
Volume :
13
Issue :
1
Pages :
443-7
Peer reviewed :
Peer reviewed
Funders :
SNSF [200021_178825, CRSK-2_196061] European Research Council [694955-INSEETO] Fond National de Recherche Luxembourg through a PEARL grant [FNR/P12/4853155/Kreisel] Fond National de Recherche Luxembourg through INTER mobility grant [INTER/Mobility/19/13992074] Fond National de Recherche Luxembourg through project EXPAND [ANR-17-CE24-0032] SNF Ambizione grant [PZ00P2_180035] Natural Environment Research Council [NE/B505738/1, NE/F017081/1] Engineering and Physical Sciences Research Council [EP/I036079/1, EP/P024904/1] National Natural Science Foundation of China (NSFC) [12074242, 51911530124] Science and Technology Commission of Shanghai Municipality [21JC1402600]
Commentary :
The authors thank Christian Tzschaschel, Steven Huband and Inmaculada Peral Alonso for fruitful discussions. MCW and MF are grateful for financial support from the SNSF (Grant No. 200021_178825), European Research Council (Advanced Grant 694955-INSEETO), MCW also for the support from the SNSF Spark funding CRSK-2_196061. MCW, MG, CT and JK acknowledge financial support from the Fond National de Recherche Luxembourg through a PEARL grant (FNR/P12/4853155/Kreisel), BD through an INTER mobility grant (INTER/Mobility/19/13992074) and the project EXPAND (ANR-17-CE24-0032) and AS and YK through the SNF Ambizione PZ00P2_180035 grant. RUS facilities were established and supported through grants from the Natural Environment Research Council (NE/B505738/1, NE/F017081/1) and the Engineering and Physical Sciences Research Council (EP/I036079/1, EP/P024904/1) awarded to MAC. SC and WR are grateful for financial support from the National Natural Science Foundation of China (NSFC, Nos. 12074242, 51911530124), and the Science and Technology Commission of Shanghai Municipality (No.21JC1402600).
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