Invited Speech

1. J.Akimitsu； Recent Development in the Ladder Compound, Taniguchi Symposium on Physics and Chemistry of Transition Metal Oxides(1998/05/28)
2. J.Akimitsu； Spin Gap and Antiferromagnetism in Spin Ladder Compound,Second International Conference, Stripes and High-T_c Superconductivity,(Roma) (1998/06/02)
3. J.Akimitsu； Superconductivity in the Ladder Material, Strongly Correlated Electron System-SCES 98 (Paris) (1998/07/15)
4. J. Akimitsu, T. Nagata, H. Fujino, M. Nishi, K. Kakurai and S. Katano; Spin Gap, Antiferromagnetism and Superconductivity in the Doped Ladder Materimal,The 7th ISSP International Symposium-Frontiers in Neutron Scattering Research-(1999/11/25)
5. J. Akimitsu； Superconductivity, Spin Gap and Antiferromagnetism in Ladder Material, The 22nd International Conference on Low Temperature Physics(L.T),(Helsinki) (1999/8/6)
6. J. Akimitsu； Superconductivity and Magnetism in the Spin-Ladder Compound(Sr. Ca)₁₄Cu₂₄O₄₁, I.U.Cr.18th Congress,(Glasgow) (1999/8/9)
7. H. Ichikawa and J. Akimitsu; The Direct Observation of Orbital Ordering in YTiO₃ and La_0.5Sr_1.5MnO₄, The Yamada Conference on Strongly Correlated Electron Systems,Nagano (SCES) (1999/8/24)
8. J. Akimitsu;The Magnetic Ordering in the Spin Ladder Compound Sr_2.5Ca_11.5Cu₂₄O₄₁、 8th International Conference on Muon Spin Rotation, Relaxation and Resonance(Les Diablerets) (1999/09/01)
9. J.Akimitsu; Antiferromagnetism and Spin Gap in the Two-Leg Ladder System, Pseudo Gap, Spin and Anomalous Metals,CREST International Conference, （Nagoya） (2000/1/26)
10. J. Akimitsu； Superconductivity, Spin Liquid State and Antiferromagnetism in the Spin Ladder Compound (Sr, Ca)₁₄Cu₂₄O₄₁,U.S.-Japan Neutron Scattering Workshop-Stripe in Transition Metal Oxides-,(Hawaii) (2000/1/29)
11. J. Akimitsu;Spin Liquid State and Antiferromagnetism in the Spin Ladder Compound(Sr, Ca)₁₄Cu₂₄O₄₁, 6th International Conference on Materials and Mechanism of Superconductivity and High Temperature Superconductors (M2S-HTSC-VI), (Houston) (2000/2/23)