Helical antiferromagnetic ordering in EuNi1.95As2 single crystals

Sangeetha, N. S.; Smetana, V.; Mudring, A. -V.; Johnston, D. C.

doi:10.1103/PhysRevB.100.094438

Title: Helical antiferromagnetic ordering in EuNi_1.95As₂ single crystals

Journal Article · Mon Sep 23 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.100.094438· OSTI ID:1570835

Sangeetha, N. S. ^[1];

^[2]; Mudring, A. -V. ^[2];

^[3]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Stockholm Univ. (Sweden)
Ames Lab., and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy

The Eu^{+ 2} spins-7/2 in EuNi₂ As₂ with the body-centered tetragonal ThCr₂ Si₂ structure order antiferromagnetically below the Néel 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 χ, isothermal magnetization M, heat capacity Cp, and electrical resistivity ρ measurements versus applied magnetic field H and temperature T. Vacancies are found on the Ni sites corresponding to the composition EuNi_{1.95 (1)} As 2. A good fit of the ρ (T) data by the Bloch-Grüneisen theory for metals was obtained. The _χab (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) , ρ(H_c, T) , and Cp (H _c , T) data yielded a H_c- T phase diagram separating the AFM and paramagnetic phases in good agreement with MFT. Anisotropic χ(T) literature data for the ThCr ₂ Si₂ -type helical antiferromagnet EuRh₂ As₂ were also fitted well by MFT. A comparison is made between the crystallographic and magnetic properties of ThCr₂ Si₂-type Eu M₂ Pn₂ 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.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1570835

Report Number(s):: IS-J-10052; PRBMDO; TRN: US2100039

Journal Information:: Physical Review B, Vol. 100, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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References (76)

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