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Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet EuCo2-yAs2

TitleEnhanced moments of Eu in single crystals of the metallic helical antiferromagnet EuCo2-yAs2
Publication TypeJournal Article
Year of Publication2018
AuthorsSangeetha, NS, Anand, VK, Cuervo-Reyes, E, Smetana, V, Mudring, AV, Johnston, DC
JournalPhysical Review B
Date Published04
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000429447200002
Keywordselectrical-resistivity, gadolinium, iron-based superconductors, magnetic-properties, order, phosphides, physics, pnictides, susceptibility, ternary arsenides, transition

T-N) for several crystals are reported that are fitted well by unified molecular field theory (MFT), and the Eu-Eu exchange interactions J(ij) are extracted from the fits. High-field magnetization M data for magnetic fields H parallel to ab reveal what appears to be a first-order spin-flop transition followed at higher field by a second-order metamagnetic transition of unknown origin, and then by another second-order transition to the paramagnetic (PM) state. For H parallel to c, the magnetization shows only a second-order transition from the canted AFM to the PM state, as expected. The critical fields for the AFM to PM transition are in approximate agreement with the predictions of MFT. Heat capacity C-p measurements in zero and high H are reported. Phase diagrams for H parallel to c and H parallel to ab versus T are constructed from the high-field M(H, T) and C-p(H, T) measurements. The magnetic part C-mag(T, H = 0) of C-p(T, H = 0) is extracted and is fitted rather well below T-N by MFT, although dynamic short-range AFM order is apparent in Cmag(T) up to about 70 K, where the molar entropy attains its high-T limit of R ln 8.

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