Structural and spin-glass properties of single crystal J(eff)=1/2 pyrochlore antiferromagnet NaCdCo2F7: correlating T-f with magnetic-bond-disorder

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10468145" target="_blank" >RIV/00216208:11320/23:10468145 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Ot4rJ3h6BD" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Ot4rJ3h6BD</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1402-4896/acdeb7" target="_blank" >10.1088/1402-4896/acdeb7</a>

Result language
angličtina
Original language name
Structural and spin-glass properties of single crystal J(eff)=1/2 pyrochlore antiferromagnet NaCdCo2F7: correlating T-f with magnetic-bond-disorder
Original language description
Weak bond disorder disrupts the expected spin-liquid ground-state of the ideal S = 1/2 Heisenberg pyrochlore antiferromagnet. Here we introduce a single crystal study of the structural and magnetic properties of the bond-disordered pyrochlore NaCdCo2F7. The magnetic susceptibility appears isotropic, with a large negative Curie-Weiss temperature (theta(CW) = -108(1) K), however no magnetic order is observed on cooling until a spin-glass transition at T-f = 4.0 K. AC-susceptibility measurements show a frequency-dependent shift of the associated cusp in chi' at T-beta, that can be fitted well by the empirical Vogel-Fulcher law. The magnetic moment of mu(eff) = 5.4(1) mu(B)/Co2+ indicates a significant orbital contribution and heat capacity measurements show that down to 1.8 K, well below T-beta only S-mag similar to 2/3 Rln(2) of the magnetic entropy is recovered, suggestive of residual continued dynamics. Structural and magnetism comparisons are made with the other known members of the NaA''Co2F7 family (A '' = Ca2+, Sr2+), confirming the expected relationship between spin-glass freezing temperature, and extent of magnetic bond disorder brought about by the size mismatch between A-site ions.
Czech name
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Czech description
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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.)

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)

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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