Spin-orbital-lattice coupling and the phonon Zeeman effect in the Dirac honeycomb magnet CoTiO3
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10508651" target="_blank" >RIV/00216208:11320/25:10508651 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=AoBM7.9Yg1" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=AoBM7.9Yg1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.111.104419" target="_blank" >10.1103/PhysRevB.111.104419</a>
Alternative languages
Result language
angličtina
Original language name
Spin-orbital-lattice coupling and the phonon Zeeman effect in the Dirac honeycomb magnet CoTiO3
Original language description
The entanglement of electronic spin and orbital degrees of freedom is often the precursor to emergent behaviors in condensed matter systems. With considerable spin-orbit coupling strength, the cobalt atom on a honeycomb lattice offers a platform that can make accessible the study of novel magnetic ground states. Using temperature-dependent Raman spectroscopy and high-magnetic-field Raman and IR spectroscopy, we studied the lattice and spin-orbital excitations in CoTiO(3), an antiferromagnetic material that exhibits topologically protected magnon Dirac crossings in the Brillouin zone. Under the application of an external magnetic field up to 22 T along the crystalline c axis, we observed the splitting of both the spin-orbital excitations and a phonon nearby in energy. Using density functional theory (DFT), we identify a number of modes that below the antiferromagnetic (AFM) transition become Raman active due to the zone folding of the Brillouin zone caused by the doubling of the magnetic unit cell. The phonon splitting under an applied magnetic field, or the phonon Zeeman effect, is observed in both a zone-centered phonon as well as its zone-folded counterpart. We use a model that includes both the spin and orbital degrees of freedom of the Co(2+) ions to explain the spin-orbital excitation energies and their behavior in an applied field. Our experimental observations along with several deviations from the model behavior point to significant coupling between the spin-orbital and the lattice excitations.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review B
ISSN
2469-9950
e-ISSN
2469-9969
Volume of the periodical
111
Issue of the periodical within the volume
10
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
104419
UT code for WoS article
001457114900003
EID of the result in the Scopus database
2-s2.0-105000472750