U2Ni2Sn and the origin of magnetic anisotropy in uranium compounds

Mašková, S.; Andreev, A. V.; Skourski, Y.; Yasin, S.; Gorbunov, D. I.; Zherlitsyn, S.; Nakotte, H.; Kothapalli, K.; Nasreen, F.; Cupp, C.; Cao, H. B.; Kolomiets, A.; Havela, L.

doi:10.1103/PhysRevB.99.064415

Title: U₂Ni₂Sn and the origin of magnetic anisotropy in uranium compounds

Journal Article · 14 February 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.99.064415 · OSTI ID:1569369

Mašková, S. ^[1]; Andreev, A. V. ^[2]; Skourski, Y. ^[3]; Yasin, S. ^[4]; Gorbunov, D. I. ^[3]; Zherlitsyn, S. ^[3]; Nakotte, H. ^[5]; Kothapalli, K. ^[6]; Nasreen, F. ^[7]; Cupp, C. ^[8]; Cao, H. B. ^[9]; Kolomiets, A. ^[10]; Havela, L. ^[1]

Charles Univ., Prague (Czech Republic). Dept. of Condensed Matter Physics
Academy of Sciences, Prague (Czech Republic). Inst. of Physics
Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany). Hochfeld-Magnetlabor Dresden (HLD-EMFL)
Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany). Hochfeld-Magnetlabor Dresden (HLD-EMFL); American Univ. of the Middle East (Kuwait). College of Engineering and Technology
New Mexico State Univ., Las Cruces, NM (United States). Dept. of Physics
New Mexico State Univ., Las Cruces, NM (United States). Dept. of Physics; King Univ., Bristol, TN (United States). College of Arts and Sciences
Univ. of Nevada, Las Vegas, NV (United States). High Pressure Science and Engineering Center (HiPSEC) and Dept. of Physics and Astronomy
King Univ., Bristol, TN (United States). College of Arts and Sciences
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Charles Univ., Prague (Czech Republic). Dept. of Condensed Matter Physics; Lviv Poytechnic National Univ., Lviv (Ukraine). Dept. of Physics

Here, U₂Ni₂Sn is a member of a large family of intermetallic compounds with the tetragonal Mo₂FeB₂ crystal structure. It orders antiferromagnetically at 25 K with propagation vector $$q = (0, 0, \frac{1}{2})$$. Magnetization, magnetoacoustic, and neutron-diffraction experiments on a single crystal provide evidence that the uranium moments align parallel to the $$c$$ axis with the anisotropy energy of ≈170 K, indicating that U₂Ni₂Sn can be classified as an Ising system. The results are at variance with previous studies on polycrystals, which indicated different magnetic structure, and which were incompatible with the $5f - 5f$ two-ion anisotropy model dominant in most U band systems. High-field magnetization studies exhibit a weak linear response for fields along the basal plane up to the highest field applied (60 T), while the $$c$$-axis magnetization curve exhibits three metamagnetic transitions at approximately 30, 39, and 50 T. The U magnetic moments of $$0.87 μ_B$$, the low magnetic entropy, and the enhanced Sommerfeld coefficient $$γ$$ = 187 mJ/mol f.u.K² suggest that U₂Ni₂Sn can be classified as an itinerant antiferromagnet with strong electron-electron correlations.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1569369

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 99; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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