papers
Publications (3)
cond-mat.str-el1999
Quantum Phase Transitions in Two-Dimensional Spin Systems with Ladder, Plaquette and Mixed-Spin Structures
A. Koga, S. Kumada, N. Kawakami
cond-mat.str-el1997
Mixed-Spin Ladders and Plaquette Spin Chains
A. Koga, S. Kumada, N. Kawakami +1
cond-mat.str-el1998
Two-Dimensional Quantum Spin Systems with Ladder and Plaquette Structure
A. Koga, S. Kumada, N. Kawakami