Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 8: Electronic Structure and Spin-Orbit Interaction I
O 8.10: Talk
Monday, March 31, 2014, 12:45–13:00, GER 38
Hysteretic melting of a soliton lattice in a commensurate charge modulation — •Tobias Mauerer1, Pin-Jui Hsu1, Matthias Vogt1, J.J. Yang2, Yoon Seok Oh3, S-W. Cheong2,3, Matthias Bode1, and Weida Wu3 — 1Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Laboratory for Pohang Emergent Materials and Department of Physics,Pohang University of Science and Technology, Pohang 790-784, Republic of Korea — 3Rutgers Center for Emergent Materials and Department of Physics and Astronomy,Rutgers University, Piscataway, New Jersey 08854, USA
We report on the observation of the irreversible transition
of a commensurate charge modulation in IrTe2
from transport and scanning tunneling microscopy (STM) studies.
Below the transition (TC ≈ 275 K on cooling)
a q = 1/5 charge modulation was observed, which is consistent with previous studies [1,2].
Additional modulations [qn = (3n+2)−1] appear
below a second transition at TS ≈ 180 K on cooling.
The coexistence of various modulations persist up to TC on warming.
The atomic structures of charge modulations
and the temperature-dependent STM studies suggest that 1/5 modulation
is a periodic soliton lattice which partially melts below TS on cooling.
Our results provide compelling evidence
that the ground state of IrTe2
is a commensurate 1/6 charge modulation,
which originates from periodic dimerization of Te atoms
visualized by atomically resolved STM images.
J. J. Yang et al., Phys. Rev. Lett. 108, 116402 (2012).
S. Pyon et al., J. Phys. Soc. Jap. 81, 053701 (2012).