Magnetic properties of the itinerant A- type antiferromagnet CaCo2P2 studied by Co59 and P31 nuclear magnetic resonance

Higa, N.; Ding, Q. -P.; Teruya, A.; Yogi, M.; Hedo, M.; Nakama, T.; Ōnuki, Y.; Furukawa, Y.

doi:10.1103/PhysRevB.98.184433

Title: Magnetic properties of the itinerant A- type antiferromagnet ${CaCo}_{2} P_{2}$ studied by ${}^{59}{Co}$ and ${}^{31}P$ nuclear magnetic resonance

Journal Article · 29 November 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.98.184433 · OSTI ID:1487220

Higa, N. ^[1]; Ding, Q. -P. ^[2]; Teruya, A. ^[3]; Yogi, M. ^[3]; Hedo, M. ^[3]; Nakama, T. ^[3]; Ōnuki, Y. ^[3]; Furukawa, Y. ^[2]

Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Univ. of the Ryukyus, Okinawa (Japan). Dept. of Physics and Earth Sciences
Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Univ. of the Ryukyus, Okinawa (Japan). Dept. of Physics and Earth Sciences

⁵⁹Co and ³¹P nuclear magnetic resonance (NMR) measurements in external magnetic and zero magnetic fields have been performed to investigate the magnetic properties of the A-type antiferromagnetic (AFM) CaCo₂P₂. NMR data, especially the nuclear spin lattice relaxation rates 1/T₁ exhibiting a clear peak, provide clear evidence for the AFM transition at a Néel temperature of T_N ~ 110 K. The magnetic fluctuations in the paramagnetic state were found to be three-dimensional ferromagnetic, suggesting ferromagnetic interaction between Co spins in the ab plane characterizes the spin correlations in the paramagnetic state. In the AFM state below TN, we have observed ⁵⁹Co and ³¹P NMR signals under zero magnetic field. From ⁵⁹Co NMR data, the ordered magnetic moments of Co are found to be in ab plane and are estimated to be 0.35 μ_B at 4.2 K. Furthermore, the external field dependence of ⁵⁹Co NMR spectrum in the AFM state suggests a very weak magnetic anisotropy of the Co ions and also provides microscopic evidence of canting the Co-ordered moments along the external magnetic field directions. The magnetic state of the Co ions in CaCo₂ P₂ is well explained by the local-moment picture in the AFM state, although the system is metallic, as seen by 1/T₁T = constant behavior.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: Japan Society for the Promotion of Science KAKENHI; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1487220

Report Number(s):: IS-J-9826

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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