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Crystals grown from molten salts

Dr Ryutaro Okuma

Visitor - Computer account only

Research theme

  • Quantum materials

Sub department

  • Condensed Matter Physics

Research groups

  • Quantum magnetism and quantum phase transitions
ryutaro.okuma@physics.ox.ac.uk
Telephone: 01865 (2)72310
Clarendon Laboratory, room 051,106
  • About
  • Publications

Synthesized pharmacosiderite

Emergent topological magnetism in Hund's excitonic insulator

ArXiv 2405.16781 (2024)

Authors:

R Okuma, K Yamagami, Y Fujisawa, CH Hsu, Y Obata, N Tomoda, M Dronova, K Kuroda, H Ishikawa, K Kawaguchi, K Aido, K Kindo, YH Chan, H Lin, Y Ihara, T Kondo, Y Okada

Compass-model physics on the hyperhoneycomb lattice in the extreme spin-orbit regime: Data archive

University of Oxford (2024)

Authors:

Ryutaro Okuma, Kylie MacFarquharson, Roger D Johnson, David Voneshen, Pascal Manuel, Radu Coldea

Abstract:

This dataset contains plain text files containing the data presented in the corresponding manuscript.

Selective synthesis and crystal chemistry of candidate rare earth Kitaev materials honeycomb and hyperhoneycomb Na2PrO3: Data archive

University of Oxford (2024)

Authors:

Ryutaro Okuma, Kylie MacFarquharson, Radu Coldea

Abstract:

This dataset contains plain text files containing the data presented in Figures 1, 4, 6, 7 and 8 of the corresponding manuscript published in Inorganic Chemistry.

Negative-chirality order in S = 1/2 kagome antiferromagnet CdCu3(OH)6(NO3)2·H2O

Physical Review B American Physical Society 106:2 (2022) 24401

Authors:

Yoshihiko Ihara, Ryoga Hiyoshi, Masakazu Shimohashi, Kaoru Hayashi, Ryutaro Okuma, Fabio Orlandi, Pascal Manuel, Gøran J Nilsen, Zenji Hiroi

Abstract:

Neutron diffraction and nuclear magnetic resonance (NMR) measurements have been used to analyze the magnetic structure in the S = 1 2 kagome antiferromagnet CdCu 3 ( OH ) 6 ( NO 3 ) 2 ⋅ H 2 O . Below the magnetic ordering temperature T N ≃ 4 K , magnetic Bragg reflections at (101) and (100) were found in the neutron diffraction pattern, which suggests a q = 0 magnetic structure. Furthermore, the vector spin chirality for the q = 0 structure was successfully identified from the internal field direction obtained by the 14 N -NMR measurement, previous magnetization measurements, and magnetic symmetry analysis. Our findings point to a chirality-ordered magnetic structure with negative vector chirality and ⟨ 100 ⟩ anisotropy.

Magnetic frustration in a van der Waals metal CeSiI

Physical Review Materials American Physical Society (APS) 5:12 (2021) l121401

Authors:

Ryutaro Okuma, Clemens Ritter, Gøran J Nilsen, Yoshinori Okada

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