Superconducting behavior of BaTi<sub>2</sub>Bi<sub>2</sub>O and its pressure dependence

Wang, Yanan; Li, Huan; Taguchi, Tomoya; Suzuki, Atsushi; Miura, Akari; Goto, Hidenori; Eguchi, Ritsuko; Miyazaki, Takafumi; Liao, Yen Fa; Ishii, Hirofumi; Kubozono, Yoshihiro

doi:10.1039/d0cp04771f

Cited by 5 publications

(11 citation statements)

References 32 publications

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“…However, phase-I completely disappears after the collapse transition in BaTi 2 Sb 2 O, whereas it remains in BaTi 2 (Sb 1– y Bi y ) 2 O ( y = 0.2) up to 22 GPa. As described later, no collapse transition occurs in BaTi 2 (Sb 1– y Bi y ) 2 O ( y = 0.5 and 0.8) and BaTi 2 Bi 2 O under pressure, indicating a robustness of the crystal lattice of phase-I against pressure. Therefore, the coexistence of phase-I and phase-II in BaTi 2 (Sb 1– y Bi y ) 2 O ( y = 0.2) under pressure seems to reasonably reflect the nature of both BaTi 2 Sb 2 O and BaTi 2 Bi 2 O.…”

Section: Resultsmentioning

confidence: 62%

“…It is important to note that the collapse transition does not occur in BaTi 2 (Sb 1−y Bi y ) 2 O (y = 0.8); i.e., the collapse transition is closely related to the enhancement of T c . In addition, the T c −p behavior is slightly different from that of BaTi 2 Bi 2 O, 13 which shows an increase in T c at pressures up to 4 GPa and a constant T c (∼7.0 K) above 4 GPa.…”

Section: Resultsmentioning

confidence: 75%

“…Studies on superconductivity under pressure have been conducted thus far for BaTi 2 Sb 2 O, Ba 1– x A x Ti 2 Sb 2 O, ,, and BaTi 2 Bi 2 O . Among these, Ba 1– x A x Ti 2 Sb 2 O indicated the emergence of a new pressure-induced superconducting phase that showed a rapid increase in T c .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 75%

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

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“…6(b) shows the reduced critical field, h *, against t of KBi 2 at 0.790 GPa, which was determined from the formula, ; We attempted to fit curves to the h * – t plot based on three models— s -wave dirty limit model, s -wave clean limit model, and p -wave polar model. 41–43 In the case of p -wave polar model, curves with two models ( h *(0) = 0.80 and 0.85) were drawn, 44,45 whereas h *(0) was 0.72 and 0.69 for the s -wave clean and dirty limit models, respectively (the Werthamer-Helfand-Hohenberg (WHH) theory was used). 41,42 As indicated in Fig.…”

Section: Resultsmentioning

confidence: 99%

Pressure dependence of superconductivity in alkali-Bi compounds KBi₂ and RbBi₂

Ikeda

Suzuki

et al. 2022

Phys. Chem. Chem. Phys.

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“…Isovalent doping via Sb/Bi mixing yields an intriguing two-dome T c evolution with a non-superconducting or low T c phase in between [6,17]. More recently, pressure has been demonstrated to be an effective control parameter for superconductivity [18].…”

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Theory for doping trends in titanium oxypnictide superconductors

Xu,

Guterding,

Jeschke

2021

Preprint

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A family of titanium oxypnictide materials BaTi2Pn2O (P n = pnictogen) becomes superconducting when a charge and/or spin density wave is suppressed. With hole doping, isovalent doping and pressure, a whole range of tuning parameters is available. We investigate how charge doping controls the superconducting transition temperature Tc. To this end, we use experimental crystal structure data to determine the electronic structure and Fermi surface evolution along the doping path. We show that a naive approach to calculating Tc via the density of states at the Fermi level and the McMillan formula systematically fails to yield the observed Tc variation. On the other hand, spin fluctuation theory pairing calculations allow us to consistently explain the Tc increase with doping. All alkali doped materials Ba1−xAxTi2Sb2O (A=Na, K, Rb) are described by a sign-changing swave order parameter. Susceptibilities also reveal that the physics of the materials is controlled by a single Ti 3d orbital.

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Superconducting behavior of BaTi₂Bi₂O and its pressure dependence

Abstract: A possible Dirac semimetal, BaTi2Bi2O, indicates a sign of topologically nontrivial nature in superconductivity at high pressure.

Cited by 5 publications

References 32 publications

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

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

Pressure dependence of superconductivity in alkali-Bi compounds KBi₂ and RbBi₂

Theory for doping trends in titanium oxypnictide superconductors

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Superconducting behavior of BaTi2Bi2O and its pressure dependence

Abstract: A possible Dirac semimetal, BaTi2Bi2O, indicates a sign of topologically nontrivial nature in superconductivity at high pressure.

Cited by 5 publications

References 32 publications

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

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

Pressure dependence of superconductivity in alkali-Bi compounds KBi2 and RbBi2

Theory for doping trends in titanium oxypnictide superconductors

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Product

Resources

About

Superconducting behavior of BaTi₂Bi₂O and its pressure dependence

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

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

Pressure dependence of superconductivity in alkali-Bi compounds KBi₂ and RbBi₂