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Title: Magnetism of classical pyrochlore antiferromagnet Na3Mn(CO3)2Cl
Authors: Nawa, K
Okuyama, D
Avdeev, M
Nojiri, H
Yoshida, M
Ueta, D
Yoshizawa, H
Sato, TJ
Keywords: Pyrochlore
Neutron diffraction
Temperature range 0065-0273 K
Issue Date: 3-Mar-2020
Publisher: American Physical Society
Citation: Nawa, K., Okuyama, D., Avdeev, M., Nojiri, H., Yoshida, M., Ueta, D., Yoshizawa, H., & Sato, T. (2020). Magnetism of classical pyrochlore antiferromagnet Na3Mn(CO3)2Cl. Paper presented at APS March Meeting, March 2–6, Denver, Colorado. In Bulletin of the American Physical Society, 65(1). Retrieved from
Abstract: Pyrochlore antiferromagnets have attracted interests in terms of unconventional ground states and spin excitations owing to competing interactions. When its magnetism is dominated by classical spins coupled by Heisenberg interactions, a spin liquid state is expected as its ground state because of infinite degeneracy in the ground state (R. Moessner and J. T. Chalker, Phys. Rev. Lett. 80, 2929 (1998); Phys. Rev. B 58, 12049 (1998).). In this research, we report structural and magnetic properties together with low-temperature neutron diffraction patterns on a new pyrochlore antiferromagnet Na3Mn(CO3)2Cl. The structure of Na3Mn(CO3)2Cl is isotypic with that of the Co-analogue Na3Co(CO3)2Cl, which exhibits all-in-all-out magnetic order below 1.5 K (Z. Fu et al., Phys. Rev. B 87, 214406 (2013)). On the other hand, no magnetic Bragg peak indicating a magnetic order was detected down to 0.05 K in Na3Mn(CO3)2Cl. A high degeneracy near the ground state is suggested by a magnetic entropy estimated from heat capacity experiments and enhancement of diffuse scattering from neutron diffraction experiments. © 2021 American Physical Society
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