Hysteretic melting transition of a soliton lattice in a commensurate charge modulation

Pin Jui Hsu, Tobias Mauerer, Matthias Vogt, J. J. Yang, Yoon Seok Oh, Sang-Wook Cheong, Matthias Bode, Weida Wu

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Abstract

We report on the observation of the hysteretic 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. Additional modulations [qn=(3n+2)-1] appear below a second transition at TS≈180 K on cooling. The coexistence of various modulations persists 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 that 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 the periodic dimerization of Te atoms visualized by atomically resolved STM images.

Original languageEnglish (US)
Article number266401
JournalPhysical review letters
Volume111
Issue number26
DOIs
StatePublished - Dec 27 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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