Bond competition and phase evolution on the IrTe2 surface

Li, Qing; Lin, Wenzhi; Yan, Jiaqiang; Chen, Xin; Gianfrancesco, Anthony G.; Singh, David J.; Mandrus, David; Kalinin, Sergei V.; Pan, Minghu

doi:10.1038/ncomms6358

Cited by 44 publications

(48 citation statements)

References 28 publications

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“…The complexity of the crystal structure, Fig. 1(a), can then be readily understood as due to the competition between Te p bonding and accommodation of the metal ions, similar to other complex structure tellurides, such as IrTe 2 [32]. We note that the separation of the metal ions is 4 Å, implying that direct interactions between cations will be weak and that their coupling will be via the Te lattice.…”

Section: E Electronic Structure and Transport Calculationsmentioning

confidence: 99%

Bipolar Conduction as the Possible Origin of the Electronic Transition in Pentatellurides: Metallic vs Semiconducting Behavior

et al. 2018

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The pentatellurides ZrTe 5 and HfTe 5 are layered compounds with one-dimensional transition-metal chains that show a not-yet-understood temperature-dependent transition in transport properties as well as recently discovered properties suggesting topological semimetallic behavior. Here, we report magnetotransport properties for two kinds of ZrTe 5 single crystals grown with the chemical vapor transport (CVT) and the flux method (Flux), respectively. They show distinct transport properties at zero field: The CVT crystal displays a metallic behavior with a pronounced resistance peak and a sudden sign reversal in thermopower at approximately 130 K, consistent with previous observations of the electronic transition; in striking contrast, the Flux crystal exhibits a semiconducting-like behavior at low temperatures and a positive thermopower over the whole temperature range. For both samples, strong effects on the transport properties are observed when the magnetic field is applied along the orthorhombic b and c axes, i.e., perpendicular to the chain direction. Refinements on the single-crystal x-ray diffraction and the measurements of energy dispersive spectroscopy reveal the presence of noticeable Te vacancies in the CVT samples, while the Flux samples are close to the stoichiometry. Analyses on the magnetotransport properties confirm that the carrier densities of the CVT sample are about two orders higher than those of the Flux sample. Our results thus indicate that the widely observed anomalous transport behaviors in pentatellurides actually take place in the Te-deficient samples. For the stoichiometric pentatellurides, our electronic structure calculations show narrow-gap semiconducting behavior, with different transport anisotropies for holes and electrons. For the degenerately doped n-type samples, our transport calculations can result in a resistivity peak and crossover in thermopower from negative to positive at temperatures close to those observed experimentally due to a combination of bipolar effects and different anisotropies of electrons and holes. Our present work resolves the long-standing puzzle regarding the anomalous transport behaviors of pentatellurides, as well as the electronic structure in favor of a semiconducting state.

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Section: E Electronic Structure and Transport Calculationsmentioning

confidence: 99%

Bipolar Conduction as the Possible Origin of the Electronic Transition in Pentatellurides: Metallic vs Semiconducting Behavior

et al. 2018

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“…In this study, we identify with STM a unprecedented honeycomb charge ordering in nanoscale coexistence with stripe charge orders of IrTe2 [19][20][21][22][23][24] , which is distinct from the hexagonal CDW.…”

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confidence: 99%

Nanoscale Superconducting Honeycomb Charge Order in IrTe₂

Kim

et al. 2016

Nano Lett.

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Entanglement of charge orderings and other electronic orders such as superconductivity is in the core of challenging physics issues of complex materials including high temperature superconductivity. Here, we report on the observation of a unique nanometer scale honeycomb charge ordering of the cleaved IrTe2 surface, which hosts a superconducting state. IrTe2 was recently established to exhibit an intriguing cascade of stripe charge orders. The stripe phases coexist with a hexagonal phase, which is formed locally and falls into a superconducting state below 3 K. The atomic and electronic structures of the honeycomb and hexagon pattern of this phase are consistent with the charge order nature but the superconductivity does not survive on neighboring stripe charge order domains. The present work provides an intriguing physics issue and a new direction of functionalization for two dimensional materials.Comment: 20 pages, 5 figures. arXiv admin note: substantial text overlap with arXiv:1505.0053

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“…For example, many of phase transitions are accompanied with the formation of one-dimensional (1D) striped ordering, which breaks the inherent high-temperature symmetry [4,[16][17][18][19]. What is the response of surface which already breaks the translational symmetry?…”

Section: Introductionmentioning

confidence: 99%

Surface phases of the transition-metal dichalcogenide IrTe2

Chen¹,

Kim²,

Yang³

et al. 2017

Phys. Rev. B

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Transition-metal dichalcogenide IrTe 2 has attracted attention because of striped lattice, charge ordering and superconductivity. We have investigated the surface structure of IrTe 2 , using low energy electron diffraction (LEED) and scanning tunneling microscopy (STM). A complex striped lattice modulations as a function of temperature is observed, which shows hysteresis between cooling and warming. While the bulk 5×1 and 8×1 phases appear at high temperatures, the surface ground state has the 6×1 phase, not seen in the bulk, and the surface transition temperatures are distinct from the bulk. The broken symmetry at the surface creates a quite different phase diagram, with the coexistence of several periodicities resembling devil's staircase behavior.

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Bond competition and phase evolution on the IrTe2 surface

Cited by 44 publications

References 28 publications

Bipolar Conduction as the Possible Origin of the Electronic Transition in Pentatellurides: Metallic vs Semiconducting Behavior

Bipolar Conduction as the Possible Origin of the Electronic Transition in Pentatellurides: Metallic vs Semiconducting Behavior

Nanoscale Superconducting Honeycomb Charge Order in IrTe₂

Surface phases of the transition-metal dichalcogenide IrTe2

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Bond competition and phase evolution on the IrTe2 surface

Cited by 44 publications

References 28 publications

Bipolar Conduction as the Possible Origin of the Electronic Transition in Pentatellurides: Metallic vs Semiconducting Behavior

Bipolar Conduction as the Possible Origin of the Electronic Transition in Pentatellurides: Metallic vs Semiconducting Behavior

Nanoscale Superconducting Honeycomb Charge Order in IrTe2

Surface phases of the transition-metal dichalcogenide IrTe2

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Product

Resources

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Nanoscale Superconducting Honeycomb Charge Order in IrTe₂