Eom Man Jin, Kim Kyoo, Jo Y J, Yang J J, Choi E S, Min B I, Park J-H, Cheong S-W, Kim Jun Sung
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
Department of Physics, Kyungpook National University, Daegu 702-701, Korea.
Phys Rev Lett. 2014 Dec 31;113(26):266406. doi: 10.1103/PhysRevLett.113.266406. Epub 2014 Dec 30.
We report a de Haas-van Alphen (dHvA) oscillation study on IrTe2 single crystals showing complex dimer formations. By comparing the angle dependence of dHvA oscillations with band structure calculations, we show distinct Fermi surface reconstruction induced by a 1/5-type and a 1/8-type dimerizations. This verifies that an intriguing quasi-two-dimensional conducting plane across the layers is induced by dimerization in both cases. A phase transition to the 1/8 phase with higher dimer density reveals that local instabilities associated with intra- and interdimer couplings are the main driving force for complex dimer formations in IrTe2.
