Electronic structure of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>BaTi</mml:mtext><mml:mn>2</mml:mn></mml:msub></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>As</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:mo>O</mml:mo></mml:math>parent compound of the titanium-based oxypnictide superconductor

Xu, H. C.; Xu, Min; Peng, Rui; Zhang, Y.; Ge, Q. Q.; Qin, Fenghua; Xia, Mingxu; Ying, Jianjun; Chen, X. H.; Yu, Xiang-Long; Zou, Liang‐Jian; Arita, Masashi; Shimada, Kenya; Takeuchi, Masaki; Lü, Donghui; Xie, Bin; Feng, Dongxia

doi:10.1103/physrevb.89.155108

Cited by 17 publications

(20 citation statements)

References 35 publications

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“…On the other hand, a conventional CDW should be evident through an associated structural distortion. However, initial electron and neutron diffraction studies on the Sb endmember 26 found no broken symmetry or any signature of superlattice formation at low temperatures, nor was a CDW gap formation observed in angle-resolved photoemission measurements of the nested Fermi surfaces (although a slight depression of the density of states at other momenta was found to correlate in temperature with the resistivity anomaly 35 ). The possibility of an incommensurate CDW was also ruled out by 121/123 Sb nuclear resonance measurements 31 .…”

Section: Resultsmentioning

confidence: 99%

Intra-unit-cell nematic charge order in the titanium-oxypnictide family of superconductors

Frandsen

Božin

et al. 2014

Nat Commun

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Understanding the role played by broken-symmetry states such as charge, spin and orbital orders in the mechanism of emergent properties, such as high-temperature superconductivity, is a major current topic in materials research. That the order may be within one unit cell, such as nematic, was only recently considered theoretically, but its observation in the iron-pnictide and doped cuprate superconductors places it at the forefront of current research. Here, we show that the recently discovered BaTi 2 Sb 2 O superconductor and its parent compound BaTi 2 As 2 O form a symmetry-breaking nematic ground state that can be naturally explained as an intra-unit-cell nematic charge order with d-wave symmetry, pointing to the ubiquity of the phenomenon. These findings, together with the key structural features in these materials being intermediate between the cuprate and iron-pnictide hightemperature superconducting materials, render the titanium oxypnictides an important new material system to understand the nature of nematic order and its relationship to superconductivity.

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Section: Resultsmentioning

confidence: 99%

Intra-unit-cell nematic charge order in the titanium-oxypnictide family of superconductors

Frandsen

Božin

et al. 2014

Nat Commun

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“…Indeed, such shapes have been recently observed by state-of-the-art Angle-Resolved Photo Emission Spectroscopy (ARPES) applied to BaTi 2 As 2 O and BaTi 2 Sb 2 O single crystals. [25,26] Subedi [15] worked on BaTi 2 Sb 2 O using DFT and reported the possible lattice instability toward CDW with √ 2 × √ 2 × 1 superstructure at low temperature. Experimentally, however, no such superlattice peaks were found by neutron and electron diffractions for this compound, [17,27] reviving the argument over if the anoma-lies in ρ(T ) and χ(T ) can be really attributed to the phonondriven CDW or not.…”

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confidence: 99%

Phonon dispersions and Fermi surfaces nesting explaining the variety of charge ordering in titanium-oxypnictides superconductors

Nakano

Hongo

2016

Sci Rep

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There has been a puzzle between experiments and theoretical predictions on the charge ordering of layered titanium-oxypnictides superconductors. Unconventional mechanisms to explain this discrepancy have been argued so far, even affecting the understanding of superconductivity on the compound. We provide a new theoretical prediction, by which the discrepancy itself is resolved without any complicated unconventional explanation. Phonon dispersions and changes of nesting vectors in Fermi surfaces are clarified to lead to the variety of superlattice structures even for the common crystal structures when without CDW, including orthorhombic 2 × 2 × 1 one for BaTi2As2O, which has not yet been explained successfully so far, being different from tetragonal for BaTi2Sb2O and BaTi2Bi2O. The electronic structure analysis can naturally explain experimental observations about CDW including most latest ones without any cramped unconventional mechanisms.

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“…In the sibling compound BaTi 2 As 2 O (Ref. 27 ), large energy scale spectral weight transfer with broad lineshape was reported. With decreasing temperature, some parts of the bands in BaTi 2 As 2 O get suppressed through the CDW transition, while some parts of the bands get enhanced.…”

Section: Resultsmentioning

confidence: 99%

“…Anomalous temperature dependent spectral weight redistribution and broad lineshape with incoherent character was reported in BaTi 2 As 2 O (Ref. 27), an iso-structural compound of Na 2 Ti 2 Sb 2 O. It was found that partial energy gap opens at the Fermi patches, instead of Fermi surface nesting, is responsible for the CDW in BaTi 2 As 2 O.…”

Section: Formation Of the Density Wave Energy Gapmentioning

confidence: 87%

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

Tan

Jiang

et al. 2015

Sci Rep

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The electronic structure of Na2Ti2Sb2O single crystal is studied by photon energy and polarization dependent angle-resolved photoemission spectroscopy (ARPES). The obtained band structure and Fermi surface agree well with the band structure calculation of Na2Ti2Sb2O in the non-magnetic state, which indicates that there is no magnetic order in Na2Ti2Sb2O and the electronic correlation is weak. Polarization dependent ARPES results suggest the multi-band and multi-orbital nature of Na2Ti2Sb2O. Photon energy dependent ARPES results suggest that the electronic structure of Na2Ti2Sb2O is rather two-dimensional. Moreover, we find a density wave energy gap forms below the transition temperature and reaches 65 meV at 7 K, indicating that Na2Ti2Sb2O is likely a weakly correlated CDW material in the strong electron-phonon interaction regime.

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Electronic structure of theBaTi2As2Oparent compound of the titanium-based oxypnictide superconductor

Cited by 17 publications

References 35 publications

Intra-unit-cell nematic charge order in the titanium-oxypnictide family of superconductors

Intra-unit-cell nematic charge order in the titanium-oxypnictide family of superconductors

Phonon dispersions and Fermi surfaces nesting explaining the variety of charge ordering in titanium-oxypnictides superconductors

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

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