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Helical antiferromagnetic ordering in EuNi1.95As2 single crystals
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-0763-1457
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Number of Authors: 42019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 9, article id 094438Article in journal (Refereed) Published
Abstract [en]

The Eu(+2 )spins-7/2 in EuNi2As2 with the body-centered tetragonal ThCr2Si2 structure order antiferromagnetically below the Ned temperature T-N = 15 K into a helical antiferromagnetic (AFM) structure with the helix axis aligned along the tetragonal c axis and the Eu ordered moments aligned ferromagnetically within the ab plane as previously reported from neutron diffraction measurements [T. Jin et al., Phys. Rev. B 99, 014425 (2019)]. Here we study the crystallographic, magnetic, thermal, and electronic transport properties of Bi flux grown single crystals using single-crystal x-ray diffraction, anisotropic magnetic susceptibility chi, isothermal magnetization M, heat capacity C-p, and electrical resistivity rho measurements versus applied magnetic field H and temperature T. Vacancies are found on the Ni sites corresponding to the composition EuNi1.95(1)As2. A good fit of the rho(T) data by the Bloch-Grijneisen theory for metals was obtained. The chi(ab )(T) data below T-N are fitted well by molecular field theory (MFT), and the helix turn angle kd and the Eu-Eu Heisenberg exchange constants are extracted from the fit parameters. The kd value is in good agreement with the neutron-diffraction result. The magnetic contribution to the zero-field heat capacity below T-N is also fitted by MFT. The isothermal in-plane magnetization M-ab exhibits two metamagnetic transitions versus H, whereas M-c(T = 2 K) is nearly linear up to H = 14 T, both behaviors being consistent with MFT. The M-c(H, T), rho(H-c, T ), and C-p(H-c, T ) data yielded aH(c)-T phase diagram separating the AFM and paramagnetic phases in good agreement with MFT. Anisotropic chi(T) literature data for the ThCr2Si2-type helical antiferromagnet EuRh2As2 were also fitted well by MFT. A comparison is made between the crystallographic and magnetic properties of ThCr2Si2-type EuM(2)Pn(2) compounds with M = Fe, Co, Ni, Cu, or Rh, and Pn = P or As, where only ferromagnetic and c-axis helical AFM structures are found.

Place, publisher, year, edition, pages
2019. Vol. 100, no 9, article id 094438
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Physical Sciences Chemical Sciences Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-175707DOI: 10.1103/PhysRevB.100.094438ISI: 000488250400003OAI: oai:DiVA.org:su-175707DiVA, id: diva2:1369950
Available from: 2019-11-13 Created: 2019-11-13 Last updated: 2019-11-13Bibliographically approved

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Smetana, VolodymyrMudring, Anja-Verena
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