TY - JOUR
T1 - Quantum spin fluctuations and hydrogen bond network in the antiferromagnetic natural mineral henmilite
AU - Yamamoto, Hajime
AU - Sakakura, Terutoshi
AU - Jeschke, Harald O.
AU - Kabeya, Noriyuki
AU - Hayashi, Kanata
AU - Ishikawa, Yuya
AU - Fujii, Yutaka
AU - Kishimoto, Shunji
AU - Sagayama, Hajime
AU - Shigematsu, Kei
AU - Azuma, Masaki
AU - Ochiai, Akira
AU - Noda, Yukio
AU - Kimura, Hiroyuki
N1 - Funding Information:
The authors thank Prof. Masakazu Matsubara and Daiki Sekine (Tohoku University), Dr. Takayuki Asano (University of Fukui), Dr. Koji Kaneko (Japan Atomic Energy Agency), and Dr. Koichi Momma (National Museum of Nature and Science) for productive discussions. This work has been financially supported by the TEPCO Memorial Foundation (Grant No. 19-022), Grant-in-Aid for Scientific Research (Grant No. 19K15280) from the Japan Society for the Promotion of Science (JSPS), and the Collaborative Research Projects of Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology. The SXRD experiments were performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2019G566).
Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/10
Y1 - 2021/10
N2 - Henmilite {Ca2Cu(OH)4[B(OH)4]2} is a blue calcium copper borate mineral found only in the Fuka mine, Okayama Prefecture, Japan. Crystal structure refinement, magnetic and specific heat measurements, and density functional theory (DFT) calculations are performed to clarify its magnetic properties. Synchrotron x-ray diffraction experiments reveal that the hydrogen-bonded chains are arranged in an antiferroelectric manner, doubling the unit cell along the a axis. An antiferromagnetic transition is observed at 0.2 K at zero magnetic field. Furthermore, a dome-shaped antiferromagnetic ordering region exists in the temperature-magnetic-field phase diagram, indicating the presence of quantum spin fluctuations. The obtained crystal structure in combination with DFT calculations suggests that the system has a coupled two-leg ladder magnetic lattice, explaining the very low ordering temperature.
AB - Henmilite {Ca2Cu(OH)4[B(OH)4]2} is a blue calcium copper borate mineral found only in the Fuka mine, Okayama Prefecture, Japan. Crystal structure refinement, magnetic and specific heat measurements, and density functional theory (DFT) calculations are performed to clarify its magnetic properties. Synchrotron x-ray diffraction experiments reveal that the hydrogen-bonded chains are arranged in an antiferroelectric manner, doubling the unit cell along the a axis. An antiferromagnetic transition is observed at 0.2 K at zero magnetic field. Furthermore, a dome-shaped antiferromagnetic ordering region exists in the temperature-magnetic-field phase diagram, indicating the presence of quantum spin fluctuations. The obtained crystal structure in combination with DFT calculations suggests that the system has a coupled two-leg ladder magnetic lattice, explaining the very low ordering temperature.
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U2 - 10.1103/PhysRevMaterials.5.104405
DO - 10.1103/PhysRevMaterials.5.104405
M3 - Article
AN - SCOPUS:85117219311
VL - 5
JO - Physical Review Materials
JF - Physical Review Materials
SN - 2475-9953
IS - 10
M1 - 104405
ER -