Photoemission study of the electronic structure and charge density waves of Na2Ti2Sb2O

Tan, Shanjun; Jiang, Juan; Ye, Z. R.; Niu, X. H.; Song, Yu; Zhang, C. L.; Dai, Pengcheng; Xie, B. P.; Lai, Xinchun; Feng, Dongxia

doi:10.1038/srep09515

Cited by 12 publications

(9 citation statements)

References 33 publications

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“…In Figure d, our data show that the spectral weight decreases with temperature increasing over a very large energy scale, which is far beyond the impact due to the broadening of the Fermi–Dirac function. This unusual temperature-dependent behavior may result from the strong interaction between electrons and bosons in a solid. − More specifically, when there are polarons in a solid, ARPES data could show a similar phenomenon. − For example, in SrTiO 3 , there are secondary characteristic spectral weights under the main conduction bands. When the temperature rises, the spectral weight decreases gradually within a considerable energy scale .…”

Section: Resultsmentioning

confidence: 99%

Electronic Structures of Cr-Intercalated ZrTe₂ Revealed by Angle-Resolved Photoemission Spectroscopy

et al. 2020

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The intercalation of transition metal atoms into the van der Waals gap of the layered transition metal dichalcogenides (TMDCs) results in modulations of electronic structures and transport properties of the host materials. In order to reveal the physical mechanism of intercalation, it is essential to elucidate the band structures, especially near the Fermi level, which contributes significantly to physical properties of a solid. Taking advantage of angle-resolved photoemission spectroscopy (ARPES), we studied how Cr intercalation modifies the electronic structures of the pristine ZrTe 2 in the intercalated compound Cr 0.4 ZrTe 2 . By comparing with the semimetal band structures of ZrTe 2 , we found a nonrigid shift in the band dispersions of Cr 0.4 ZrTe 2 , in which an indirect gap opens between the valence and conduction bands with only electron-type carriers contributing to the electronic states at the Fermi level. Moreover, additional electronic states emerge below the bottom of the conduction band at M and exhibit a strong temperature-dependent behavior. Our studies show that the intercalation of atoms in van der Waals crystals could regulate the inherent band dispersions of the host materials and induce new physical properties.

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Section: Resultsmentioning

confidence: 99%

Electronic Structures of Cr-Intercalated ZrTe₂ Revealed by Angle-Resolved Photoemission Spectroscopy

et al. 2020

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“…This is probably due to either the fact that the band gap value is significantly smaller than the resolution of the ARPES instrument (~18 meV) or the difficulty of cleaning the sample surface. Certainly, another temperature-dependent ARPES experiment must be performed to further clarify the opening of the band gap of the SIS sample that exhibits the CDW feature, particularly to elucidate how the band gap is related to the nesting properties at the Fermi surface and the k -dependent “ kinking ” of the band dispersions that are caused by electron-phonon coupling4041. Typically, a perfect or partial nesting of the Fermi surface can induce the CDW and satellite peaks, as observed using XRS in Fig.…”

Section: Resultsmentioning

confidence: 99%

Electronic and atomic structures of the Sr3Ir4Sn13 single crystal: A possible charge density wave material

Wang

Srivastava

et al. 2017

Sci Rep

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X-ray scattering (XRS), x-ray absorption near-edge structure (XANES) and extended x-ray absorption fine structure (EXAFS) spectroscopic techniques were used to study the electronic and atomic structures of the high-quality Sr3Ir4Sn13 (SIS) single crystal below and above the transition temperature (T* ≈ 147 K). The evolution of a series of modulated satellite peaks below the transition temperature in the XRS experiment indicated the formation of a possible charge density wave (CDW) in the (110) plane. The EXAFS phase derivative analysis supports the CDW-like formation by revealing different bond distances [Sn1(2)-Sn2] below and above T* in the (110) plane. XANES spectra at the Ir L3-edge and Sn K-edge demonstrated an increase (decrease) in the unoccupied (occupied) density of Ir 5d-derived states and a nearly constant density of Sn 5p-derived states at temperatures T < T* in the (110) plane. These observations clearly suggest that the Ir 5d-derived states are closely related to the anomalous resistivity transition. Accordingly, a close relationship exists between local electronic and atomic structures and the CDW-like phase in the SIS single crystal.

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“…The non-doped Ti-based oxypnictides show similar, yet much enhanced, anomalies in electrical transport, magnetic susceptibility, and specific heat 4,24,39,40 . Partial gap opening on the Fermi surface or Fermi patches was observed from angle-resolved photoemission spectroscopy (ARPES) 27,33,35 .…”

Section: Discussionmentioning

confidence: 99%

“…Materials with M = Ti mostly show a metallic behavior, and undergo a possible DW transition [16][17][18] . There have been a lot of debates on the nature of the DW transition [22][23][24][25][26][27][28][29][30][31][32][33] . The most recent results confirm a charge-density-wave (CDW) [34][35][36] or a nematic charge order 37,38 , depending on specific material system.…”

Section: Introductionmentioning

confidence: 99%

Weak metal-metal transition in the vanadium oxytelluride Rb$_{1-δ}$V$_2$Te$_2$O

Ablimit,

Sun,

Jiang

et al. 2018

Preprint

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We report the synthesis, crystal structure, physical properties, and first-principles calculations of a vanadium-based oxytelluride Rb 1−δ V2Te2O (δ ≈ 0.2). The crystal structure bears two-dimensional V2O square nets sandwiched with tellurium layers, mimicking the structural motifs of cuprate and iron-based superconductors. The material exhibits metallic conductivity with dominant hole-type charge carriers. A weak metal-to-metal transition takes place at ∼100 K, which is conformably characterized by a slight kink/hump in the electrical resistivity, jumps in the Hall and Seebeck coefficients, a minute drop in the magnetic susceptibility, and a small peak in the heat capacity. Neither Bragg-peak splitting nor superlattice reflections can be detected within the resolution of conventional x-ray diffractions. The band-structure calculations show that V-3d orbitals dominate the electronic states at around Fermi energy where a dyz/dxz orbital polarization shows up. There are three Fermi-surface sheets that seem unfavorable for nesting. Our results suggest an orbital or spin-density-wave order for the low-temperature state and, upon suppression of the competing order, emergence of superconductivity could be expected.

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Photoemission study of the electronic structure and charge density waves of Na2Ti2Sb2O

Cited by 12 publications

References 33 publications

Electronic Structures of Cr-Intercalated ZrTe₂ Revealed by Angle-Resolved Photoemission Spectroscopy

Electronic Structures of Cr-Intercalated ZrTe₂ Revealed by Angle-Resolved Photoemission Spectroscopy

Electronic and atomic structures of the Sr3Ir4Sn13 single crystal: A possible charge density wave material

Weak metal-metal transition in the vanadium oxytelluride Rb$_{1-δ}$V$_2$Te$_2$O

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Photoemission study of the electronic structure and charge density waves of Na2Ti2Sb2O

Cited by 12 publications

References 33 publications

Electronic Structures of Cr-Intercalated ZrTe2 Revealed by Angle-Resolved Photoemission Spectroscopy

Electronic Structures of Cr-Intercalated ZrTe2 Revealed by Angle-Resolved Photoemission Spectroscopy

Electronic and atomic structures of the Sr3Ir4Sn13 single crystal: A possible charge density wave material

Weak metal-metal transition in the vanadium oxytelluride Rb$_{1-δ}$V$_2$Te$_2$O

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Electronic Structures of Cr-Intercalated ZrTe₂ Revealed by Angle-Resolved Photoemission Spectroscopy

Electronic Structures of Cr-Intercalated ZrTe₂ Revealed by Angle-Resolved Photoemission Spectroscopy