Magnetic polarons due to spin-length fluctuations in d4 spin-orbit Mott systems
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F25%3A00140141" target="_blank" >RIV/00216224:14310/25:00140141 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevB.111.195125" target="_blank" >https://doi.org/10.1103/PhysRevB.111.195125</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.111.195125" target="_blank" >10.1103/PhysRevB.111.195125</a>
Alternative languages
Result language
angličtina
Original language name
Magnetic polarons due to spin-length fluctuations in d4 spin-orbit Mott systems
Original language description
Mott insulators based on 4d and 5d transition-metal ions, where spin-orbit interaction plays a key role, can exhibit various forms of unusual magnetism. A particular example is the antiferromagnet Ca2RuO4 containing d4Ru4+ ions. Here the spin-orbit interaction stabilizes the nonmagnetic J=0 singlet ionic ground state, which gets dynamically mixed, via exchange interactions, with low-energy J=1 ionic excitations. Thanks to a sufficient strength of the exchange, these excitations condense and a long-range order emerges. The resulting ordered moments are soft and prone to fluctuations of their effective length. The corresponding amplitude mode appears as a prominent magnetic excitation and complements the conventional magnons involving rotations of the moments. Motivated by this peculiar kind of magnetic order and the specific spectrum of magnetic excitations, we study their influence on the propagation of doped carriers. To this end, we construct a microscopic model including both d4 and d5 degrees of freedom and address the propagation of an injected electron by employing self-consistent Born approximation. We find that the electron shows a combination of both free and a polaronic type of motion, where the mobile carrier strongly interacts with an accompanying cloud of magnetic excitations. Remarkably, in the latter case it is the exotic excitation, the amplitude mode, that is found to dominate over the contribution of magnons. Our soft-spin situation thus largely contrasts with spin polarons widely discussed in the context of doped Heisenberg-type magnets based on rigid spin moments.
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
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
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
19
Country of publishing house
US - UNITED STATES
Number of pages
20
Pages from-to
195125
UT code for WoS article
001495020000003
EID of the result in the Scopus database
2-s2.0-105005405107