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Title: Magnetic Structure and Quadrupolar Order Parameter Driven by Geometrical Frustration Effect in NdB 4

Abstract

Neutron diffraction experiments have been carried out to characterize the magnetic structures and order parameters in an intermediate phase of NdB 4 showing the successive phase transitions at T 0 = 17.2 K, T N1 = 7.0 K, and T N2 = 4.8 K. We have revealed the antiferromagnetic ordering with the propagation vectors q0=(0,0,0), q0 and qs1=(δ,δ,0.4) (δ ~ 0.14), and q 0 and q s2=(0.2,0,0.4) in phase II (T N1 < T < T 0), phase III (T N2 < T < T N1), and phase IV (T < T N2), respectively. The observed patterns in phase II are successfully explained by postulating a coplanar structure with static magnetic moments in the tetragonal ab-plane. We have found that the magnetic structure in phase II can be uniquely determined to be a linear combination of antiferromagnetic “all-in/all-out”-type (Γ 4) and “vortex”-type (Γ 2) structures, consisting of a Γ 4 main component (77%) with a small amplitude of Γ 2 (23%). Finally, we propose that the quadrupolar interaction holds the key to stabilizing the noncollinear magnetic structure and quadrupolar order. Here, the frustration in the Shastry–Sutherland lattice would play an essential role in suppressing the dominance of the magnetic interaction.

Authors:
 [1];  [1];  [2];  [2];  [1]; ORCiD logo [3]; ORCiD logo [3]
  1. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Materials Sciences Research Center
  2. Yokohama National Univ., Yokohama (Japan). Faculty of Engineering
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Japan Society for the Promotion of Science (JSPS)
OSTI Identifier:
1426593
Grant/Contract Number:
AC05-00OR22725; 25390133
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of the Physical Society of Japan
Additional Journal Information:
Journal Volume: 86; Journal Issue: 4; Journal ID: ISSN 0031-9015
Publisher:
Physical Society of Japan
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Yamauchi, Hiroki, Metoki, Naoto, Watanuki, Ryuta, Suzuki, Kazuya, Fukazawa, Hiroshi, Chi, Songxue, and Fernandez-Baca, Jaime A. Magnetic Structure and Quadrupolar Order Parameter Driven by Geometrical Frustration Effect in NdB 4. United States: N. p., 2017. Web. doi:10.7566/JPSJ.86.044705.
Yamauchi, Hiroki, Metoki, Naoto, Watanuki, Ryuta, Suzuki, Kazuya, Fukazawa, Hiroshi, Chi, Songxue, & Fernandez-Baca, Jaime A. Magnetic Structure and Quadrupolar Order Parameter Driven by Geometrical Frustration Effect in NdB 4. United States. doi:10.7566/JPSJ.86.044705.
Yamauchi, Hiroki, Metoki, Naoto, Watanuki, Ryuta, Suzuki, Kazuya, Fukazawa, Hiroshi, Chi, Songxue, and Fernandez-Baca, Jaime A. Sat . "Magnetic Structure and Quadrupolar Order Parameter Driven by Geometrical Frustration Effect in NdB 4". United States. doi:10.7566/JPSJ.86.044705. https://www.osti.gov/servlets/purl/1426593.
@article{osti_1426593,
title = {Magnetic Structure and Quadrupolar Order Parameter Driven by Geometrical Frustration Effect in NdB 4},
author = {Yamauchi, Hiroki and Metoki, Naoto and Watanuki, Ryuta and Suzuki, Kazuya and Fukazawa, Hiroshi and Chi, Songxue and Fernandez-Baca, Jaime A.},
abstractNote = {Neutron diffraction experiments have been carried out to characterize the magnetic structures and order parameters in an intermediate phase of NdB4 showing the successive phase transitions at T0 = 17.2 K, TN1 = 7.0 K, and TN2 = 4.8 K. We have revealed the antiferromagnetic ordering with the propagation vectors q0=(0,0,0), q0 and qs1=(δ,δ,0.4) (δ ~ 0.14), and q0 and qs2=(0.2,0,0.4) in phase II (TN1 < T < T0), phase III (TN2 < T < TN1), and phase IV (T < TN2), respectively. The observed patterns in phase II are successfully explained by postulating a coplanar structure with static magnetic moments in the tetragonal ab-plane. We have found that the magnetic structure in phase II can be uniquely determined to be a linear combination of antiferromagnetic “all-in/all-out”-type (Γ4) and “vortex”-type (Γ2) structures, consisting of a Γ4 main component (77%) with a small amplitude of Γ2 (23%). Finally, we propose that the quadrupolar interaction holds the key to stabilizing the noncollinear magnetic structure and quadrupolar order. Here, the frustration in the Shastry–Sutherland lattice would play an essential role in suppressing the dominance of the magnetic interaction.},
doi = {10.7566/JPSJ.86.044705},
journal = {Journal of the Physical Society of Japan},
number = 4,
volume = 86,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2017},
month = {Sat Apr 15 00:00:00 EDT 2017}
}

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