Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7
2016.04.27 15:34
날짜 | 2016-04-28 15:00 |
---|---|
일시 | Apr. 28 (Thu.) 3PM |
장소 | #2501(E6-2. 2nd fl.) |
연사 | Dr. Chang Hee Sohn, SEOUL NATIONAL UNIVERSITY |
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)
댓글 0
번호 | 날짜 | 장소 | 제목 |
---|---|---|---|
13 | 2014-03-10 16:00 | E6, 1501 | Physics Colloquium : 2014 Spring |
12 | 2013-09-09 16:00 | E6, 1501 | Physics Colloquium : 2013 Fall |
11 | 2013-03-11 16:00 | E6, 1501 | Physics Colloquium : 2013 Spring |
10 | 2012-04-02 16:00 | E6, 1501 | A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4 |
9 | 2012-02-13 16:00 | E6, 1501 | Physics Colloquium : 2012 Spring |
8 | 2011-09-03 16:00 | E6, 1501 | Physics Colloquium : 2011 Fall |
7 | 2011-05-16 16:00 | E6, 1501 | Photonics with surface plasmon polaritons |
6 | 2010-09-06 16:00 | E6, 1501 | Physics Colloquium : 2010 Fall |
5 | 2010-02-14 16:00 | E6, 1501 | Physics Colloquium - 2011 Spring |
4 | 2010-02-08 16:00 | E6, 1501 | Physics Ciolloquium : 2010 Spring |
3 | 2009-10-21 16:00 | E6, 1501 | Interdimensional Universality of Dynamic Interfaces |
2 | 2009-09-07 16:00 | E6, 1501 | Physics Colloquium : 2009 Fall |
1 | 2009-02-23 16:00 | E6, 1501 | Physics Colloquium : 2009 Spring |