Neutron Brillouin Scattering Experiments with Pulsed Neutrons on High Resolution Chopper Spectrometer HRC

1st Conference on Light and Particle Beams in Materials Science 2013

物理学;材料科学

Itoh, S.^1,2 ; Yokoo, T.^1,2 ; Kawana, D.^3 ; Kaneko, Y.^4 ; Tokura, Y.^4,5 ; Fujita, M.^6 ; Yoshida, K.^7 ; Saito, K.^2,8 ; Inami, N.^2,8 ; Takeichi, Y.^2,8 ; Ono, K.^2,8 ; Endoh, Y.^1,4,6

Neutron Science Division, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan^1

Condensed Matter Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan^2

Institute for Solid State Physics, University of Tokyo, Toyo 319-1106, Japan^3

RIKEN Center for Emergent Matter of Science, Wako 351-0198, Japan^4

Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan^5

Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan^6

Department of Chemistry, Fukuoka University, Fukuoka 814-0180, Japan^7

Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan^8

关键词: Dispersion curves;    Ferromagnetic spin;    High resolution;    Inelastic neutrons;    Nd2Fe14B;    Neutron brillouin scattering;    Pulsed neutron;    Spinwave excitation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/502/1/012043/pdf
DOI  :  10.1088/1742-6596/502/1/012043

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We improved the High Resolution Chopper Spectrometer (HRC), which is installed at MLF in J-PARC, in order to perform neutron Brillouin scattering (NBS) experiments, and successfully demonstrated a feasibility of this method. Gapless spin-wave excitations were observed in La0.8Sr0.2MnO3, which were in good agreement with previous results using single crystals, on the other hand, a large energy gap in the ferromagnetic spin waves was found in SrRuO3. Spin-wave peaks in a permanent magnet Nd2Fe14B were on the dispersion curve determined previously using a single crystal. Excitations, so-called fast sound, in liquid D2O were in a good agreement with previous inelastic neutron scattering experiments and the dispersion curve were extended to the lower Q region.