Magnetism of Novel Kapellasite-type Quantum Kagome Antiferromagnet InCu₃(OH)₆Cl₃

Datum

09.12.2024

Zeit

14:50 - 16:20

Sprecher

Moyu Kato

Zugehörigkeit

Hokkaido University & MPI-FKF

Serie

TUD Physik-IFMP Institutsseminar

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Host

D. Peets

Beschreibung

Abstract

The quantum kagome antiferromagnet is a good playground for searching for quantum many-body states. Not only zero-field spin liquids, but also magnon crystallization with 7/9, 5/9, and ⅓ magnetization and field-induced spin liquids with ⅑ magnetization have been predicted [1]. However, the lack of ideal model materials and the difficulty of precise measurements under ultra-high magnetic fields of around 100 T have prevented experimental verification of these rich theoretical predictions. We succeeded in synthesizing a novel model quantum kagome antiferromagnet, InCu₃(OH)₆Cl₃ (In-kapellasite). It crystallizes in the trigonal space group P31m with lattice constants a=12.3235 Å and c=6.0347 Å and a kapellasite-type kagome network [2]. Although the kagome network is slightly distorted because Cu forms two different isosceles triangles, there is a three-fold axis on the In site, which marks a significant difference from other distorted kagome materials [2]. The antiferromagnetic Curie-Weiss temperature and effective magnetic moment of In-kapellasite are estimated to be ΘW=–12.8 K and peff=2.05, respectively. Short-range order occurs at 7 K where the magnetic susceptibility exhibits a slight upturn and the heat capacity shows a broad peak. Subsequently, long-range magnetic order develops at 1.8 K, evidenced by a sharp peak in the heat capacity. In high-field magnetization measurements up to 50 T, the full magnetization process to saturation was observed. Interestingly, a ⅓-magnetization plateau is observed at relatively low fields of ~7–14 T.

[1] S. Nishimoto et al., Nat. Commun. (https://doi.org/10.1038/ncomms3287) (2013).
[2] H.K. Yoshida et al., JPSJ (https://doi.org/10.7566/JPSJ.86.033704) (2017).

BigBlueButton: https://bbb.tu-dresden.de/b/dar-mbs-me8-gsc (https://bbb.tu-dresden.de/b/dar-mbs-me8-gsc)

Links

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Letztmalig verändert: 09.12.2024, 07:36:37