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Physical properties of metallic antiferromagnetic CaCo1.86As2 single crystals

TitlePhysical properties of metallic antiferromagnetic CaCo1.86As2 single crystals
Publication TypeJournal Article
Year of Publication2014
AuthorsAnand, VK, Dhaka, RS, Lee, Y, Harmon, BN, Kaminski, A, Johnston, DC
JournalPhysical Review B
Date Published06
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000338639100002
Keywordscaco2p2, heat, high-temperature superconductivity, laco2p2, magnetic-properties, order, phosphides, ternary arsenides, transition

eel temperature TN = 52(1) K with the easy axis being the tetragonal c axis. However, no clear evidence from the.(T) and Cp(T) data for a magnetic transition at TN is observed. A metallic ground state is demonstrated from the band calculations and the.(T), C-p(T), and ARPES data, and spin-polarized calculations indicate a competition between the A-type AFM and FM ground states. The C-p(T) data exhibit a large Sommerfield electronic coefficient reflecting a large density of states at the Fermi energy D(EF) that is enhanced compared with the band structure calculation where the bare D(EF) arises from Co 3d bands. At 1.8 K, theM(H) data for Hc exhibit a well-defined first-order spin-flop transition at an applied field of 3.5 T. The small ordered moment of 0.3 B/Co obtained from the M(H) data at low T, the large exchange enhancement of. and the lack of a self-consistent interpretation of the.(T) and M(H, T) data in terms of a local moment Heisenberg model together indicate that the magnetism of CaCo1.86As2 is itinerant.

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