Multi-Step Magnetic Transitions in EuNiIn₄

Journal Article · Wed Jan 15 00:00:00 EST 2020 · Journal of the Physical Society of Japan

DOI:https://doi.org/10.7566/JPSJ.89.014707· OSTI ID:1615987

Ikeda, Shugo ^[1]; Kaneko, Koji ^[2]; Tanaka, Yuki ^[1]; Kawasaki, Takuro ^[3]; Hanashima, Takayasu ^[4]; Munakata, Koji ^[4]; Nakao, Akiko ^[4]; Kiyanagi, Ryoji ^[3]; Ohhara, Takashi ^[3]; Mochizuki, Kenji ^[5]; Kondo, Akihiro ^[5]; Kindo, Koichi ^[5]; Homma, Yoshiya ^[6]; Frontzek, Matthias D.  ^[7]; Kobayashi, Hisao ^[1]

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1. Univ. of Hyogo, Koto, Hyogo (Japan). Graduate School of Material Science and Center for Novel Material Science under Multi-extreme Conditions
2. Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki (Japan). Materials Sciences Research Center and J-PARC Center
3. Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki (Japan). J-PARC Center
4. Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibarak (Japan). Center for Neutron Science and Technology
5. Univ. of Tokyo (Japan). Inst. for Solid State Physics
6. Tohoku Univ., Oarai, Ibaraki (Japan). Inst. for Materials Research
7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division

Magnetism in EuNiIn4 is studied using specific heat, magnetic susceptibility, magnetization, ¹⁵¹Eu Mössbauer spectroscopy, and neutron diffraction experiments. The specific heat exhibited two magnetic transitions at T_N1 = 15.2 K and T_N2 = 14.3 K at zero magnetic field. An antiferromagnetic ground state of EuNiIn₄ was observed to have a uniaxial magnetic anisotropy along the b axis using magnetic susceptibility and 151Eu Mössbauer spectroscopy. Further, single crystal neutron diffraction experiments illustrated that this antiferromagnetic structure in the ground state is characterized by the commensurate propagation vector q=(1/2,1/2,1/2), which reveals no distinct anomaly at T_N2. The magnetization curve along the b axis at 2 K was observed to exhibit four successive magnetic field-induced transitions up to 50 kOe, following which it increased linearly, resulting in saturated magnetization of 7 μ_B/f.u. above 195.2 kOe, as expected of Eu²⁺ free ions. The magnetic phase diagram for H ∥ b in EuNiIn₄ was found to have unique characteristics with five magnetic states in low magnetic fields.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); Japan Atomic Energy Agency (JAEA); Japan Society for the Promotion of Science (JSPS)
• Grant/Contract Number: AC05-00OR22725; 24540336; 26400348; JP16K05031
• OSTI ID: 1615987
• Journal Information: Journal of the Physical Society of Japan, Vol. 89, Issue 1; ISSN 0031-9015
• Publisher: Physical Society of Japan
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EuNiIn4
multi magnetic transitions
151Eu
Mossbauer spectroscopy
neutron diffraction experiment