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Magnetic properties of the itinerant A-type antiferromagnet CaCo2P2 studied by Co-59 and P-31 nuclear magnetic resonance

TitleMagnetic properties of the itinerant A-type antiferromagnet CaCo2P2 studied by Co-59 and P-31 nuclear magnetic resonance
Publication TypeJournal Article
Year of Publication2018
AuthorsHiga, N, Ding, QP, Teruya, A, Yogi, M, Hedo, M, Nakama, T, Onuki, Y, Furukawa, Y
JournalPhysical Review B
Volume98
Pagination184433
Date Published11
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000452001200001
KeywordsMaterials Science, nmr, phosphides, physics, relaxation, superconductivity
Abstract

Co-59 and P-31 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/T-1 exhibiting a clear peak, provide clear evidence for the AFM transition at a Ned temperature of T-N similar to 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 T-N, we have observed Co-59 and P-31 NMR signals under zero magnetic field. From Co-59 NMR data, the ordered magnetic moments of Co are found to be in ab plane and are estimated to be 0.35 mu(B) at 4.2 K. Furthermore, the external field dependence of Co-59 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 CaCo2P2 is well explained by the local-moment picture in the AFM state, although the system is metallic, as seen by 1/T1T = constant behavior.

DOI10.1103/PhysRevB.98.184433
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Complex States

Alternate JournalPhys. Rev. B