Fermi Surface Evolution Across Multiple Charge Density Wave Transitions in ErTe3

Moore, R. G.; Brouet, V.; He, R.; Lu, D. H.; Ru, N.; Chu, J. -H.; Fisher, I. R.; Shen, Z. -X.

Fermi Surface Evolution Across Multiple Charge Density Wave Transitions in ErTe3

Authors

Description

The Fermi surface (FS) of ErTe3 is investigated using angle-resolved photoemission spectroscopy (ARPES). Low temperature measurements reveal two incommensurate charge density wave (CDW) gaps created by perpendicular FS nesting vectors. A large Delta_1 = 175 meV gap arising from a CDW with c* - q_CDW1 ~ 0.70(0) c* is in good agreement with the expected value. A second, smaller Delta_2 = 50 meV gap is due to a second CDW with a* - q_CDW2 ~ 0.68(5) a*. The temperature dependence of the FS, the two gaps and possible interaction between the CDWs are examined.
4 pages, 3 figures