Structural phase transition associated with van Hove singularity in 5d transition metal compound IrTe<sub>2</sub>

Qian, Tian; Miao, H.; Wang, Z J; Shi, Xun; Huang, Yi-Zhi; Zhang, P; Xu, Na; Zeng, Linghui; Z, J; Richard, P.; Shi, M.; Xu, Gang; Dai, Xi; Fang, Zhong; Fang, A. F.; Wang, N L; Ding, Hong

doi:10.1088/1367-2630/16/12/123038

Cited by 26 publications

(29 citation statements)

References 36 publications

(73 reference statements)

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“…Compared with the structure, the interlayer interaction of the C 2/ m structure and hence its band dispersion along the c axis (Γ- A direction) are suppressed, so that the 2D character of the FSs becomes enhanced. The reconfiguration in the topology of FSs along the k z direction appears to be consistent with what has been observed in angle-resolved photoemission spectroscopy measurements151617.…”

Section: Resultssupporting

confidence: 86%

Novel structural phases and superconductivity of iridium telluride under high pressures

Huang

Sun

et al. 2014

Sci Rep

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Transition metal selenide and telluride have recently receive considerable attention due to their possible structural relation to ferropnictide. Pressure is often used as an efficient way to modify the crystal or electronic structure that in many cases lead to new material states of interest. Here we search the structures of IrTe2 up to 150 GPa using crystal structure prediction techniques combining with ab initio calculations. Three new stable phases under high pressures are predicted, and their electronic structure properties, phonon spectra, and electron-phonon couplings are also investigated. Significant reconstructions of band structures and Fermi surfaces are found in these new phases. Calculated results show that while the C2/m-2 phase has bad metal behavior and very weak electron-phonon coupling, the and I4/mmm phases have relatively higher electron-phonon coupling up to ~ 1.5 and 0.7, respectively. The variable-composition searching have been performed, newly compounds with different stoichiometries, such as IrTe3, IrTe, and Ir3Te, are predicted to be thermodynamically and dynamically stable at high pressures. The pressure range investigated here is accessible in the diamond anvil cell experiments, thus our results might stimulate further experimental studies.

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Section: Resultssupporting

confidence: 86%

Novel structural phases and superconductivity of iridium telluride under high pressures

Huang

Sun

et al. 2014

Sci Rep

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“…This sizable high-T spreading of FS is due to non zero value of self energy at ω = 0. The flower-shaped Fermi surface is consistent with the earlier calculation [22,37]. Along A-L-H-A direction six connected beads can also be identified in the FS map at 290 K which seems to be smeared out at low temperature.…”

Section: Introductionsupporting

confidence: 89%

Phase transition in IrTe2 induced by spin-orbit coupling

Koley

2016

Solid State Communications

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IrTe2 has been renewed as an interesting system showing competing phenomenon between a questionable density-wave transition near 270 K followed by superconductivity with doping of high atomic number materials. Higher atomic numbers of Te and Ir supports strong spin-orbital coupling in this system. Using dynamical mean field theory with LDA band structure I have introduced Rashba spin orbit coupling in this system to get the interpretation for anomalous resistivity and related transition in this system. While no considerable changes are observed in DMFT results of Ir-5d band other than orbital selective pseudogap 'pinned' to Fermi level, Te-p band shows a van Hove singularity at the Fermi level except low temperature. Finally I discuss the implications of these results in theoretical understanding of ordering in IrTe2.

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“…Another example of VHs nesting has been found recently in 5d transition metal compound IrTe 2 [257]. It has been shown that the band related to the saddle points at the Fermi level is strongly reconstructed below transition temperature, removing VHs from E F and the wavevector between the adjacent saddle points is consistent with the in-plane structural modulation vector.…”

Section: E Vhs Nesting and Mott Gap In Tmdmentioning

confidence: 68%

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article)

Kordyuk¹

2015

Low Temperature Physics

136

126

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A term first coined by Mott back in 1968 a "pseudogap" is the depletion of the electronic density of states at the Fermi level, and pseudogaps have been observed in many systems. However, since the discovery of the high-temperature superconductors (HTSC) in 1986, the central role attributed to the pseudogap in these systems has meant that by many researchers now associate the term pseudogap exclusively with the HTSC phenomenon. Recently, the problem has got a lot of new attention with the rediscovery of two distinct energy scales ("two-gap scenario") and charge density waves patterns in the cuprates. Despite many excellent reviews on the pseudogap phenomenon in HTSC, published from its very discovery up to now, the mechanism of the pseudogap and its relation to superconductivity are still open questions. The present review represents a contribution dealing with the pseudogap, focusing on results from angle resolved photoemission spectroscopy (ARPES) and ends up with the conclusion that the pseudogap in cuprates is a complex phenomenon which includes at least three different "intertwined" orders: spin and charge density waves and preformed pairs, which appears in different parts of the phase diagram. The density waves in cuprates are competing to superconductivity for the electronic states but, on the other hand, should drive the electronic structure to vicinity of Lifshitz transition, that could be a key similarity between the superconducting cuprates and iron-based superconductors. One may also note that since the pseudogap in cuprates has multiple origins there is no need to recoin the term suggested by Mott. V C 2015 AIP Publishing LLC. [http://dx.

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Structural phase transition associated with van Hove singularity in 5d transition metal compound IrTe₂

Cited by 26 publications

References 36 publications

Novel structural phases and superconductivity of iridium telluride under high pressures

Novel structural phases and superconductivity of iridium telluride under high pressures

Phase transition in IrTe2 induced by spin-orbit coupling

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article)

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Structural phase transition associated with van Hove singularity in 5d transition metal compound IrTe2

Cited by 26 publications

References 36 publications

Novel structural phases and superconductivity of iridium telluride under high pressures

Novel structural phases and superconductivity of iridium telluride under high pressures

Phase transition in IrTe2 induced by spin-orbit coupling

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article)

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Structural phase transition associated with van Hove singularity in 5d transition metal compound IrTe₂