Dirac fermions in the layered titanium-based oxypnictide superconductor 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>BaTi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:math>

Shi, Xianbiao; Chen, Li; He, Peng; Wang, Guangtao; Zheng, Gong-Ping; Liu, Xin; Zhao, Weiwei

doi:10.1103/physrevb.99.155155

Cited by 10 publications

(8 citation statements)

References 63 publications

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“…Bi-based compounds have shown very intriguing properties such as a topological quantum nature and the emergence of a superconducting state. − The most significant property is their topological quantum nature found in Bi-chalcogenides such as Bi 2– x Sb x Te 3– y Se y . − Bi 2 Se 3 is a well-known topological insulator . Moreover, some of the Bi compounds such as Bi 3 Na and A 3 Bi (A: Na, K, and Rb) are categorized as “Dirac semimetals” − based on experimental and theoretical approaches.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, some of the Bi compounds such as Bi 3 Na and A 3 Bi (A: Na, K, and Rb) are categorized as “Dirac semimetals” − based on experimental and theoretical approaches. Recently, the compound BaTi 2 Bi 2 O has also been reported to be a Dirac semimetal . Many Bi-based topological materials have shown superconductivity. − Actually, the topological insulators such as Bi 2– x Sb x Te 3– y Se y and PdBi 2 showed superconductivity or the enhancement of superconducting transition temperature ( T c ) via the application of pressure − and chemical doping. , …”

Section: Introductionmentioning

confidence: 99%

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Pressure Dependence of Superconductivity in a Charge-Density-Wave Superconductor Bi₂Rh₃Se₂

et al. 2023

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The structural and superconducting properties of a Bi-based compound, Bi2Rh3Se2, are investigated over a wide pressure range. Bi2Rh3Se2 is a superconductor with a superconducting transition temperature, T c, of 0.7 K. This compound is in a charge-density-wave (CDW) state below 240 K, which implies the coexistence of superconducting and CDW states at low temperatures. Here, the superconducting properties of Bi2Rh3Se2 are studied from the perspective of the temperature dependence of electrical resistance (R) at high pressures (p’s). The pressure dependence of T c of Bi2Rh3Se2 shows a slow increase in T c at 0–15.5 GPa, and the T c slowly decreases with pressure above 15.5 GPa, which is markedly different from that of normal superconductors because the value of T c should simply decrease owing to the decrease in density of states (DOS) on the Fermi level, N(εF), driven by a simple shrinkage of the lattice under pressure. To ascertain the origin of such a dome-like T c–p behavior, the crystal structure of Bi2Rh3Se2 was explored over a wide pressure range of 0–20 GPa on the basis of powder X-ray diffraction; no structural phase transitions or simple shrinkage of the lattice was observed. This result implies that the increase in T c against pressure cannot simply be explained from a structural point of view. In other words, a direct relation between superconductivity and crystal structure was not found. On the other hand, the CDW transition became ambiguous at pressures higher than 3.8 GPa, suggesting that the T c had been suppressed by the CDW transition in a low pressure range. Thus, the findings suggest that for Bi2Rh3Se2, T c is enhanced through the suppression of CDW transition, which may be reasonable because the CDW-ordered state restrains the charge fluctuation to weaken the electron–phonon coupling and opens the gap to decrease the density of states on the Fermi level. The obtained dome-like T c–p behavior indicates the possibility of Bi2Rh3Se2 being an exotic superconductor.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pressure Dependence of Superconductivity in a Charge-Density-Wave Superconductor Bi₂Rh₃Se₂

et al. 2023

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“…In contrast, BaTi 2 Bi 2 O showed no CDW/SDW transition . In addition, BaTi 2 Bi 2 O is theoretically predicted to be a Dirac semimetal, protected by the C 4 symmetry of this crystal. Thus, the physical properties of BaTi 2 (Sb 1– y Bi y ) 2 O are completely distinguished depending on y .…”

Section: Introductionmentioning

confidence: 83%

“…In contrast, BaTi 2 Bi 2 O showed no CDW/SDW transition. 4 In addition, BaTi 2 Bi 2 O is theoretically predicted to be a Dirac semimetal, 9 protected by the C 4 symmetry of this crystal. Thus, the physical properties of BaTi 2 (Sb 1−y Bi y ) 2 O are completely distinguished depending on y. Namely, the first super-conducting phase at y = 0−0.4 and the second superconducting phase at y = 0.6−1.0 in BaTi 2 (Sb 1−y Bi y ) 2 O provide different physical and electronic properties.…”

Section: Introductionmentioning

confidence: 92%

Superconducting Behavior of BaTi₂(Sb_1–yBi_y)₂O under Pressure

et al. 2022

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The crystal structure and superconducting properties of a new type of titanium–pnictide superconductor, BaTi2(Sb1–y Bi y )2O (y = 0.2, 0.5, and 0.8), are comprehensively investigated over a wide pressure range to elucidate the effect of substituting Bi for Sb on the superconducting behavior. The behavior of superconducting properties under pressure changes drastically with y, as expected from the double-dome T c–y phase diagram obtained at ambient pressure. In this study, three BaTi2(Sb1–y Bi y )2O samples (y = 0.2, 0.5, and 0.8) are considered, which correspond to the first superconducting dome, nonsuperconducting part, and second superconducting dome, respectively, in the T c–y phase diagram. The crystal of BaTi2(Sb1–y Bi y )2O with y = 0.2 shows a clear collapse transition, i.e., a drastic shrinkage of the lattice constant c at ca. 5 GPa. Strictly speaking, the collapsed crystal phase coexists with the noncollapsed phase above 5 GPa. On the other hand, BaTi2(Sb1–y Bi y )2O with y = 0.8 shows a continuous change in the crystal lattice with pressure, i.e., no collapse transitions. The pressure dependence of T c for BaTi2(Sb1–y Bi y )2O with y = 0.2 shows a drastic increase in T c at approximately 5 GPa, where the collapse transition occurs, indicating a clear pressure-induced superconducting phase transition related to the collapse transition. The value of T c for BaTi2(Sb1–y Bi y )2O with y = 0.8 increases slightly up to ∼2 GPa and is almost constant at 2–13 GPa. It is found that the superconducting behavior under pressure can be unambiguously classified by y based on the double-dome T c–y phase diagram, indicative of distinguishable superconducting features at different y values. In this study, we comprehensively discuss the superconducting properties of the exotic material, BaTi2(Sb1–y Bi y )2O, with a double-dome T c–y phase diagram.

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“…Again, the possibilities of alio-and isovalent substitutions have led to superconductivity 80 and other exotic magnetic properties. 81,82 New compositions and structures expanded the Zintl concept to include transition metals through isostructural relationships, and the Zintl concept is surprisingly robust in rationalizing those new structures with no main-group-containing Zintl analog. 4−6,17−19,25,44,83−87…”

Section: ■ Introductionmentioning

confidence: 99%

Zintl Phases: From Curiosities to Impactful Materials

Kauzlarich

2023

Chem. Mater.

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The synthesis of new compounds and crystal structures remains an important research endeavor in pursuing technologically relevant materials. The Zintl concept is a guidepost for the design of new functional solid-state compounds. Zintl phases are named in recognition of Eduard Zintl, a German chemist who first studied a subgroup of intermetallics prepared with electropositive metals combined with main-group metalloids from groups 13–15 in the 1930s. Unlike intermetallic compounds, where metallic bonding is the norm, Zintl phases exhibit a combination of ionic and covalent bonding and are typically semiconductors. Zintl phases provide a palette for iso- and aliovalent substitutions that can each contribute uniquely to the properties. Zintl electron-counting rules can be employed to interrogate a structure type and develop a foundation of structure–property relationships. Employing substitutional chemistry allows for the rational design of new Zintl compounds with technological properties, such as magnetoelectronics, thermoelectricity, and other energy storage and conversion capabilities. Discovering new structure types and compositions through this approach is also possible. The background on the strength and innovation of the Zintl concept and a few highlights of Zintl phases with promising thermoelectric properties in the context of structural and electronic design will be provided.

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Dirac fermions in the layered titanium-based oxypnictide superconductor BaTi2Bi2O

Cited by 10 publications

References 63 publications

Pressure Dependence of Superconductivity in a Charge-Density-Wave Superconductor Bi₂Rh₃Se₂

Pressure Dependence of Superconductivity in a Charge-Density-Wave Superconductor Bi₂Rh₃Se₂

Superconducting Behavior of BaTi₂(Sb_1–yBi_y)₂O under Pressure

Zintl Phases: From Curiosities to Impactful Materials

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Dirac fermions in the layered titanium-based oxypnictide superconductor BaTi2Bi2O

Cited by 10 publications

References 63 publications

Pressure Dependence of Superconductivity in a Charge-Density-Wave Superconductor Bi2Rh3Se2

Pressure Dependence of Superconductivity in a Charge-Density-Wave Superconductor Bi2Rh3Se2

Superconducting Behavior of BaTi2(Sb1–yBiy)2O under Pressure

Zintl Phases: From Curiosities to Impactful Materials

Contact Info

Product

Resources

About

Pressure Dependence of Superconductivity in a Charge-Density-Wave Superconductor Bi₂Rh₃Se₂

Pressure Dependence of Superconductivity in a Charge-Density-Wave Superconductor Bi₂Rh₃Se₂

Superconducting Behavior of BaTi₂(Sb_1–yBi_y)₂O under Pressure