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Oh, Yoon Seok
Laboratory for Strong Correlation in Quantum Materials
Research Interests
  • Materials for Quantum Information Processing, Transport, and Storage
  • Quantum Magnet
  • Multiferroic

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Hierarchical stripe phases in IrTe2 driven by competition between Ir dimerization and Te bonding

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Title
Hierarchical stripe phases in IrTe2 driven by competition between Ir dimerization and Te bonding
Author
Dai, JixiaHaule, KristjanYang, J. J.Oh, Yoon SeokCheong, S-W.Wu, Weida
Keywords
DEVILS STAIRCASE; SUPERCONDUCTIVITY; TRANSITION; SUSCEPTIBILITY; ANOMALIES; SURFACE; STATE; VO2
Issue Date
2014-12
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.90, no.23, pp.235121 -
Abstract
Layered 5d transition metal dichalcogenide (TMD) IrTe2 is distinguished from the traditional TMDs (such as NbSe2) by the existence of multiple charge-density wave (CDW)-like stripe phases and superconductivity at low temperatures. Despite intensive studies, there is still no consensus on the physical origin of the stripe phases or even the ground state modulation for this 5d material. Here we present atomic-scale evidence from scanning tunneling microscopy and spectroscopy (STM/STS) that the ground state of IrTe2 is a q = 1/6 stripe phase, identical to that of the Se-doped compound. Furthermore, our data suggest that the multiple transitions and stripe phases are driven by the intralayer Ir-Ir dimerization that competes against the interlayer Te-Te bonding. The competition results in a unified phase diagram with a series of hierarchical modulated stripe phases, strikingly similar to the renowned "devil's staircase" phenomena.
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DOI
10.1103/PhysRevB.90.235121
ISSN
2469-9950
Appears in Collections:
PHY_Journal Papers
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