Degenerate ground state in the classical pyrochlore antiferromagnet Na3Mn(CO3)2Cl

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dc.contributor.authorNawa, Ken_AU
dc.contributor.authorOkuyama, Den_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorNojiri, Hen_AU
dc.contributor.authorYoshida, Men_AU
dc.contributor.authorUeta, Den_AU
dc.contributor.authorYoshizawa, Hen_AU
dc.contributor.authorSato, TJen_AU
dc.date.accessioned2021-09-02T21:51:30Zen_AU
dc.date.available2021-09-02T21:51:30Zen_AU
dc.date.issued2018-10-18en_AU
dc.date.statistics2021-08-31en_AU
dc.description.abstractIn an ideal classical pyrochlore antiferromagnet without perturbations, an infinite degeneracy in a ground state leads to the absence of magnetic order and a spin-glass transition. Here we present Na3Mn(CO3)2Cl as a new candidate compound where classical spins are coupled antiferromagnetically on the pyrochlore lattice and report its structural and magnetic properties. The temperature dependences of the magnetic susceptibility and heat capacity and the magnetization curve are consistent with those of an S=5/2 pyrochlore lattice antiferromagnet with nearest-neighbor interactions of 2 K. Neither an apparent signature of a spin-glass transition nor magnetic order is detected in magnetization and heat capacity measurements or powder neutron diffraction experiments. On the other hand, antiferromagnetic short-range order of the nearest neighbors is evidenced by the Q dependence of the diffuse scattering which develops around 0.85Å−1. A high degeneracy near the ground state in Na3Mn(CO3)2Cl is supported by the magnetic entropy, estimated as almost 4JK−2mol−1 at 0.5 K. ©2018 American Physical Societyen_AU
dc.identifier.articlenumber144426en_AU
dc.identifier.citationNawa, K., Okuyama, D., Avdeev, M., Nojiri, H., Yoshida, M., Ueta, D., Yoshizawa, H., & Sato, T. J. (2018). Degenerate ground state in the classical pyrochlore antiferromagnet Na3Mn(CO3)2Cl. Physical Review B, 98(14), 144426. doi:10.1103/PhysRevB.98.144426en_AU
dc.identifier.issn2469-9969en_AU
dc.identifier.issue14en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttps://doi.org/10.1103/PhysRevB.98.144426en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11577en_AU
dc.identifier.volume98en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectSpecific heaten_AU
dc.subjectPyrochloreen_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectTemperature dependenceen_AU
dc.titleDegenerate ground state in the classical pyrochlore antiferromagnet Na3Mn(CO3)2Clen_AU
dc.typeJournal Articleen_AU
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