  For underdoped cuprate HTSC within the framework of the two component model
of charge carries (holes and Zhang-Rice polarons) it is considered two near
degenerate states of hole molecular orbitals in copper-oxygen plane. These are
the state of hole molecular orbitals around one-site Zhang-Rice polarons, and
another state is two-site hole molecular orbitals around the two-site oxygen
cluster of two nearest Jahn-Teller copper ions with antiferromagnetic ordering
spins and with common oxygen ion. Taking into account that the vibronic mixing
of these near-degenerate electronic states leads to the Jahn-Teller dynamic
effect, in this paper the supposition that the pseudogap state is a consequence
of the Jahn-Teller pseudoeffect is discussed. It is shown that existence of
two-site Jahn-Teller polaron is consistent with a recent observation of broken
time-reversal symmetry in the pseudogap state.
