FY2023 Annual Report

Electronic and Quantum Magnetism Unit
Associate Professor Yejun Feng

Abstract

This is the seven year of the Electronic and Quantum Magnetism Unit at OIST. 

1. Staff & Students

  • Magarita Dronova, Graduate Student 
  • Sandeep Vijayan, Graduate Student 
  • Yuxiang Guan, Rotation Graduate Student 
  • Marina Razzhivina, Intern Student  
  • Aytul Sensu, Intern Student 
  • Julia Elzbieta Osmolska, Intern Student  
  • Zhanel Arshabekova, Intern Student  
  • Scott Cooper, Technical Staff 
  • Yukiko Murabayashi, Administrative Assistant

2. Collaborations

2.1 Synchrotron x-ray magnetic diffraction under high pressure

  • We explore the all-in-all-out antiferromagnetic order in Eu2Ir2O7, using resonant x-ray magnetic diffraction under continous pressure tuning towards a quantum critical point. 
  • Collaborators:
    • Professor Yishu Wang, University of Tennessee - Knoxville
    • Professor Satoru Nakatsuji, University of Tokyo

2.2 Single crystal refinement of neutron magnetic diffraction

  • We refine both the lattice and magnetic neutron diffraction data of a spinel single crystal ZnFe2O4. 
  • Collaborators:
    • Dr. Zach Morgan, ORNL, USA
    • Dr. Feng Ye, ORNL, USA
    • Dr. Vaclav Patricek, Institute of Physics of the Czech Academy of Sciences, Czech

3. Activities and Findings

3.1 Single crystal growth using high temperature solution technique

Margarita Dronova is leading the effort on single crystal growth of pyrochlore magnets and taking effort on the subsequent charcterization process.  This work is experimentally collaborated with staff scientists at the Spallation Neutron Source at Oak Ridge National Laboratory. 

3.2 Acoustoelectric effects in surface acoustic devices 

Sandeep Vijayan is leading the effort on exploring acoustoelectric effects using LiNbO3 based devices.

4. Publications

4.1 Journals

Margarita G. Dronova, Vaclav Petricek, Zachary Morgan, Feng Ye, D. M. Silevitch, Yejun Feng, Three-dimensional checkerboard spin structure on a breathing pyrochlore lattice. Phys. Rev. B. 109, 064421 (2024), as an Editor's Suggestion.

Yejun Feng, Yishu Wang, T. F. Rosenbaum, P. B. Littlewood, Hua Chen, Quantum interference in superposed lattices. Proc. Nat. Acad. Sci. USA 121, e2315787121 (2024). 

4.2 Books and other one-time publications

Nothing to report

4.3 Oral and Poster Presentations

Invited talks by the PI:

Nothing to report

Contributed poster with the PI listed:

Margarita G. Dronova, Zachary Morgan, Feng Ye, Václav Petříček, Yejun Feng, Lattice and spin structures of non-collinear antiferromagnet ZnFe2O4. 26th Congress of IUCr, Melbourne, Australia, Aug. 22-29, 2023.

5. Intellectual Property Rights and Other Specific Achievements

Nothing to report

6. Meetings and Events

Nothing to report

7. Other

Nothing to report