visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-04-28 15:00 
연사  
장소 #2501(E6-2. 2nd fl.) 

Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7

 

Apr. 28 (Thu.) 3PM, #2501(E6-2. 2nd fl.)
Dr. Chang Hee Sohn, SEOUL NATIONAL UNIVERSITY

 

We investigated strong lattice/spin/charge coupling in 5d pyrochlore Cd2Os2O7 by using optical spectroscopy. In the first part of the presentation, I’ll show strong effect of magnetic ordering on the charge dynamics of Cd2Os2O7. In this compound, we observe that all-in/all-out antiferromagnetic ordering induces a Lifshitz-type metal-insulator transition that magnetic ordering gradually annihilates the Fermi surface. In the second part of the talk, I’ll present strong spin-lattice coupling in Cd2Os2O7. We observed large renormalization of phonon frequencies below all-in/all-out antiferromagnetic ordering temperature, which can be understood in terms of modulation of Heisenberg exchange interaction and single ion anisotropy. Relevance to expected novel phenomena and future work will be discussed.

 

Contact: Eun Gook Moon, Physics Dept., (egmoon@kaist.ac.kr)

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
583 2016-04-05 16:00    A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space
582 2024-06-13 16:00    [CAPP seminars]Simulation, design and fabrication of Josephson Parametric Amplifiers for axion search file
581 2016-01-11 16:00    Mott Physics in the Strong Spin-Orbit Coupling Regime
580 2016-11-11 16:00    Dirac fermions in condensed matters
579 2019-06-28 14:00    1st Research-exchange meeting of computational material physics file
578 2025-06-05 11:00  Dr. Bruno Tomasello (University of Catania, Italy)  Crystal-Field Anisotropy and Low-Temperature Spin Seebeck in Terbium Iron Garnet file
577 2016-05-11 16:00    The quest for novel high-temperature superconductors---Prospects and progress in iridates
576 2018-02-12 15:00    The recent result of XMASS Experiment
575 2022-09-30 16:00    Spin-orbit torque-based spintronic devices file
574 2019-01-07 15:00    Many-Body Invariants for Multipoles in Higher-Order Topological Insulators file
573 2025-04-22 13:30  Dr. Chaebin Kim (Georgia Institute of Technology)  Emulation of quantum correlations by classical dynamics in quantum magnets file
572 2024-01-25 16:00    [CAPP seminars] Detecting Gravitational Waves by Elecromagnetic Cavity
571 2016-10-18 13:30    "Visualization of oxygen vacancy in motion and the interplay with electronic conduction"
» 2016-04-28 15:00    Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7
569 2019-12-13 13:00    Computational Material Designs: Current Status and Future Directions file
568 2023-11-09 16:00    Assessing the Capability of Near-Term Photonic Devices Towards Quantum Supremacy
567 2018-09-04 14:30    Ultrafast time- and angle-resolved photoemission spectroscopy (tr-ARPES) with extreme ultraviolet laser pulses file
566 2016-04-08 16:00    Spectroscopic studies of iron-based superconductors : what have we learned?
565 2023-07-26 10:00    [CAPP Seminar] Am Expansive Search for Dark Matter with ADMX and DM Radio
564 2016-10-07 16:00    “Tilt engineering of 4d and 5d transition metal oxides?”