25-30 August 2019
Henry Ford Building
Europe/Berlin timezone

THz ESR study of S=1/2 frustrated J<sub>1</sub>-J<sub>2</sub> chain NaCuMoO<sub>4</sub>(OH) as candidate substance for spin nematic

Not scheduled
4h
Harnack House and Henry Ford Building

Harnack House and Henry Ford Building

Board: 343
Poster Posters

Speaker

Dr Susumu Okubo (Molecular Photoscience Research Center, Kobe University)

Description

Recently, low-dimensional frustrated spin systems have attracted much attention to have novel ground states. The existence of a spin nematic phases, analogous to nematic liquid crystal, is expected theoretically in S=1/2 ferromagnetic and antiferromagnetic frustrated chain at slightly below the saturation field. New candidate substance NaCuMoO4(OH) shows relatively low saturation field of 25 T and no random substitution. Superexchange interactions are estimated to be J1=-51 K and J2=36 K from the magnetic susceptibility measurements. The specific heat does not show long range order down to 0.6 K. Furthermore, relaxation time from NMR measurements behave a spin density wave (SDW), which is expected blow the spin nematic phase. Previously, feature of a spin nematic phase could not observe due to powder samples. In this work, we treat a three-dimensional magnetically aligned powder sample as quasi large single crystal. This treatment is innovative sample treatments to obtain information of magnetic or other properties of anisotropy. High-frequency ESR measurements of NaCuMoO4(OH) for parallel and perpendicular fields to chain have been performed at 1.8 K using the pulsed magnetic fields up to 55 T and in the frequency region to 1.56 THz. The linewidth for H⊥chain is wider than that for H//chain. Frequency dependency of resonance field and linewidthes does not change drastically at around the saturation field. Although to observe coupled nematic spins, which is expected to have 2ω mode, twice time higher frequency measurements have been performed using FIR laser. Detailed results of frequency dependence of resonance field and linewidthes at spin nematic phase will be discussed.

Primary authors

Dr Susumu Okubo (Molecular Photoscience Research Center, Kobe University) Ms Yoko Kitahara (Graduate School of Science, Kobe University) Dr Shigeo Hara (Center for Support to Research and Education Activities, Kobe University) Dr Takahiro Sakurai (Center for Support to Research and Education Activities, Kobe University) Prof. Hitoshi Ohta (Molecular Photoscience Research Center, Kobe University) Dr Yoshizawa Daichi (Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University,) Prof. Masayuki Hagiwara (Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University) Dr Fumiko Kimura (Devision of Forest and Biomaterials Science, Kyoto University) Prof. Tsunehisa Kimura (Devision of Forest and Biomaterials Science, Kyoto University) Dr Kazuhiro Nawa (Institute of Multidisciplinary Research for Advanced Materials, Tohoku University) Dr Okamoto Yoshihito (Department of Applied Physics, Nagoya University, Nagoya) Prof. Zenji Hiroi (Institute for Solid State Physics, University of Tokyo)

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