Multi-step magnetic transitions in EuNIIN4

Shugo Ikeda; Koji Kaneko; Yuki Tanaka; Takuro Kawasaki; Takayasu Hanashima; Koji Munakata; Akiko Nakao; Ryoji Kiyanagi; Takashi Ohhara; Kenji Mochizuki; Akihiro Kondo; Koichi Kindo; Yoshiya Homma; Matthias D. Frontzek; Hisao Kobayashi

doi:10.7566/JPSJ.89.014707

Multi-step magnetic transitions in EuNIIN₄

Shugo Ikeda, Koji Kaneko, Yuki Tanaka, Takuro Kawasaki, Takayasu Hanashima, Koji Munakata, Akiko Nakao, Ryoji Kiyanagi, Takashi Ohhara, Kenji Mochizuki, Akihiro Kondo, Koichi Kindo, Yoshiya Homma, Matthias D. Frontzek, Hisao Kobayashi

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Abstract

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 ¼ ð1=2; 1=2; 1=2Þ, 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.

Original language	English
Article number	014707
Journal	Journal of the Physical Society of Japan
Volume	89
Issue number	1
DOIs	https://doi.org/10.7566/JPSJ.89.014707
State	Published - 2020

Funding

1Graduate School of Material Science and Center for Novel Material Science under Multi-extreme Conditions, University of Hyogo, Koto, Hyogo 678-1297, Japan 2Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan 3J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan 4Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan 5Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan 6Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan 7Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A. We acknowledge H. Cao, H. Yamagami, and T. Sakai for their informative discussions. The authors thank the sample environment groups at HFIR and MLF J-PARC for their support on neutron scattering experiments. This work was partly supported by JSPS KAKENHI Grant Numbers 24540336, 26400348, and JP16K05031 [Scientific Research (C)], and used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. WAND is operated jointly by ORNL and Japan Atomic Energy Agency under US-Japan Cooperative Program on Neutron Scattering. The neutron diffraction experiment on SENJU at MLF J-PARC was conducted under a user program (Proposal No. 2013I0018). Magnetization measurements due to the long-pulse magnet were performed under the Visiting Researcher's Program of the Institute for Solid State Physics, The University of Tokyo. Acknowledgment We acknowledge H. Cao, H. Yamagami, and T. Sakai for their informative discussions. The authors thank the sample environment groups at HFIR and MLF J-PARC for their support on neutron scattering experiments. This work was partly supported by JSPS KAKENHI Grant Numbers 24540336, 26400348, and JP16K05031 [Scientific Research (C)], and used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. WAND is operated jointly by ORNL and Japan Atomic Energy Agency under US–Japan Cooperative Program on Neutron Scattering. The neutron diffraction experiment on SENJU at MLF J-PARC was conducted under a user program (Proposal No. 2013I0018). Magnetization measurements due to the long-pulse magnet were performed under the Visiting Researcher’s Program of the Institute for Solid State Physics, The University of Tokyo.

Funders	Funder number
CROSS
Comprehensive Research Organization for Science and Society
DOE Office of Science
Institute for Solid State Physics
US-Japan	2013I0018
Oak Ridge National Laboratory
Japan Society for the Promotion of Science	24540336, 26400348, 19K03756, JP16K05031
Japan Society for the Promotion of Science
University of Tokyo
Japan Atomic Energy Agency
Tohoku University
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences

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10.7566/JPSJ.89.014707

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Ikeda, S., Kaneko, K., Tanaka, Y., Kawasaki, T., Hanashima, T., Munakata, K., Nakao, A., Kiyanagi, R., Ohhara, T., Mochizuki, K., Kondo, A., Kindo, K., Homma, Y., Frontzek, M. D., & Kobayashi, H. (2020). Multi-step magnetic transitions in EuNIIN₄ Journal of the Physical Society of Japan, 89(1), Article 014707. https://doi.org/10.7566/JPSJ.89.014707

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title = "Multi-step magnetic transitions in EuNIIN4 ",

abstract = "Magnetism in EuNiIn4 is studied using specific heat, magnetic susceptibility, magnetization, 151Eu M{\"o}ssbauer spectroscopy, and neutron diffraction experiments. The specific heat exhibited two magnetic transitions at TN1 = 15.2 K and TN2 = 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 M{\"o}ssbauer spectroscopy. Further, single crystal neutron diffraction experiments illustrated that this antiferromagnetic structure in the ground state is characterized by the commensurate propagation vector q ¼ {\dh}1=2; 1=2; 1=2{\TH}, which reveals no distinct anomaly at TN2. 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 μB=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.",

author = "Shugo Ikeda and Koji Kaneko and Yuki Tanaka and Takuro Kawasaki and Takayasu Hanashima and Koji Munakata and Akiko Nakao and Ryoji Kiyanagi and Takashi Ohhara and Kenji Mochizuki and Akihiro Kondo and Koichi Kindo and Yoshiya Homma and Frontzek, {Matthias D.} and Hisao Kobayashi",

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year = "2020",

doi = "10.7566/JPSJ.89.014707",

language = "English",

volume = "89",

journal = "Journal of the Physical Society of Japan",

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publisher = "Physical Society of Japan",

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TY - JOUR

T1 - Multi-step magnetic transitions in EuNIIN4

AU - Ikeda, Shugo

AU - Kaneko, Koji

AU - Tanaka, Yuki

AU - Kawasaki, Takuro

AU - Hanashima, Takayasu

AU - Munakata, Koji

AU - Nakao, Akiko

AU - Kiyanagi, Ryoji

AU - Ohhara, Takashi

AU - Mochizuki, Kenji

AU - Kondo, Akihiro

AU - Kindo, Koichi

AU - Homma, Yoshiya

AU - Frontzek, Matthias D.

AU - Kobayashi, Hisao

PY - 2020

Y1 - 2020

N2 - 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 TN1 = 15.2 K and TN2 = 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 ¼ ð1=2; 1=2; 1=2Þ, which reveals no distinct anomaly at TN2. 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 μB=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.

AB - 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 TN1 = 15.2 K and TN2 = 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 ¼ ð1=2; 1=2; 1=2Þ, which reveals no distinct anomaly at TN2. 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 μB=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.

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JO - Journal of the Physical Society of Japan

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ER -

Multi-step magnetic transitions in EuNIIN₄

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