Chemistry of layered<i>d</i>-metal pnictide oxides and their potential as candidates for new superconductors

Ozawa, Tadashi C.; Kauzlarich, Susan M.

doi:10.1088/1468-6996/9/3/033003

Cited by 132 publications

(108 citation statements)

References 89 publications

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“…The titanium pnictide oxides, such as Na 2 Ti 2 Pn 2 O and BaTi 2 Pn 2 O (Pn = As, Sb), are layered systems with distinct transport anomalies that are associated with the formation of density wave order. The transition temperatures are 330 K for Na 2 [4][5][6]. So far, the exact nature of the density wave is still unknown, although no sign of spin density wave (SDW) have been found, there is also no direct evidence for a charge density wave (CDW) ground state.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure of the titanium-based oxypnictide superconductorBa0.95Na0.05Ti2Sb2Oand direct observation of its char

Song

Yan

et al. 2016

Phys. Rev. B

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Ba 0.95 Na 0.05 Ti 2 Sb 2 O is a titanium-based oxypnictide superconductor with possible density wave order. We have performed high resolution angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy (STM) studies on Ba 0.95 Na 0.05 Ti 2 Sb 2 O. Our STM studies find a charge density wave (CDW) order with the wavevector of (π, π). The electronic structure shows both multi-orbital and three-dimensional nature, consistent with the theoretical calculations. The observed Fermi surfaces are well nested along the (π, π) direction, which might drive the CDW transition. Likely due to the weak strength of the CDW order, we do not observe a leading-edge gap. Instead, we observe an overall spectral weight enhancement with decreasing temperature, but the rate of this enhancement is abruptly reduced or diminished in the CDW state, suggesting the suppression of spectral weight or opening of a partial CDW gap. Our results give a comprehensive picture of the electronic structure and direct observation of the CDW order in Ba 0.95 Na 0.05 Ti 2 Sb 2 O.

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Section: Introductionmentioning

confidence: 99%

Electronic structure of the titanium-based oxypnictide superconductorBa0.95Na0.05Ti2Sb2Oand direct observation of its char

Song

Yan

et al. 2016

Phys. Rev. B

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“…Although this period is still quite short, already diverse reviews on this highly exciting field have been published [26][27][28][29][30][31][32][33][34] and special issues in New Journal of Physics [35] and Physica C: Superconductivity [36] have been edited. The vast numbers of physical property measurements have competently been reviewed by Johnston [37].…”

Section: Introductionmentioning

confidence: 99%

Structural chemistry of superconducting pnictides and pnictide oxides with layered structures

Johrendt

Hosono

Hoffmann

et al. 2011

Zeitschrift Für Kristallographie

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Abstract. The basic structural chemistry of superconducting pnictides and pnictide oxides is reviewed. Crystal chemical details of selected compounds and group subgroup schemes are discussed with respect to phase transitions upon charge-density formation, the ordering of vacancies, or the ordered displacements of oxygen atoms. Furthermore, the influences of doping and solid solutions on the valence electron concentration are discussed in order to highlight the structural and electronic flexibility of these materials.

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“…Very recently, superconductivity was discovered [17][18][19] in titanium-oxypnictide compounds, such as ATi 2 Pn 2 O (A ¼ Na 2 , Ba, (SrF) 2 , (SmO) 2 ; Pn ¼ As, Sb, Bi), which are close structural and chemical cousins to the cuprates and iron-pnictides [20][21][22][23][24] . In particular, in isovalent BaTi 2 (Sb 1-x Bi x ) 2 O and aliovalent Ba 1-x Na x Ti 2 Sb 2 O (ref.…”

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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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Chemistry of layeredd-metal pnictide oxides and their potential as candidates for new superconductors

Cited by 132 publications

References 89 publications

Electronic structure of the titanium-based oxypnictide superconductorBa0.95Na0.05Ti2Sb2Oand direct observation of its char

Electronic structure of the titanium-based oxypnictide superconductorBa0.95Na0.05Ti2Sb2Oand direct observation of its char

Structural chemistry of superconducting pnictides and pnictide oxides with layered structures

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

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