Optical properties of layered superconductor LixZrNCl

Takano, T.; Kitora, A.; Taguchi, Y.; Iwasa, Yoshihiro

doi:10.1016/j.jpcs.2008.06.026

Cited by 10 publications

(13 citation statements)

References 26 publications

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“…47 For the insulating compound, the reflectivity shows the similar behavior for both polarizations, with interband transitions appearing in R zz at higher energy (∼4 eV) than in R xx (∼3 eV) due to matrix element effects, consistent with the description of ǫ(ω).…”

Section: Reflectivity Spectrumsupporting

confidence: 61%

“…6 shows the calculated dependence of the real and imaginary part of both components of the dielectric function for the pristine compound as well as for Li x ZrNCl (x= 0.16, 0.25, and 0.50). For undoped ZrNCl the experimental value 47 of the static dielectric constant is ǫ 1,xx =5. From the calculated electronic structure we obtain an almost identical value.…”

Section: A Handling Of the Intraband Partmentioning

confidence: 98%

“…12 We find that actual occupation of the Li site does not alter the band structure in any significant way, with carrier doping occurring in a rigid band fashion as has been assumed in all previous works both theoretical (band structure calculations) 12 and experimental (optical reflectivity measurements). 47 For the lowest doping levels studied electrons will fill only the same single band with minimum at K with Zr-(d x 2 −y 2 ,d xy ) character using both VCA methods. For x= 0.5, some out of plane d-states start being occupied as shown in the previous section.…”

Section: Lixzrncl Within Vcamentioning

confidence: 98%

“…47 For the lowest doping levels studied electrons will fill only the same single band with minimum at K with Zr-(d x 2 −y 2 ,d xy ) character using both VCA methods. For x= 0.5, some out of plane d-states start being occupied as shown in the previous section.…”

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confidence: 98%

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Dielectric response of electron-doped ionic superconductorLixZrNCl

Botana

Pickett

2014

Phys. Rev. B

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When electron doped, the layered transition metal nitrides T NCl (T = group IVB transition metal ion) become impressive superconductors with critical temperature Tc= 15-26K. Here we take the most studied member, ZrNCl, as a representative and calculate the dielectric response ǫ(ω) versus frequency and concentration of doped electronic carriers. The static dielectric constant ǫ∞=5 is reproduced extremely well. We establish that the differences between rigid band modeling and virtual crystal treatment are small, and compare also with actual lithium doping using supercells. We obtain the variations upon changing the doping level of the reflectivity and energy loss function as well, many of which are found not to be correlated with the observed (non)variation of Tc(x). The main plasmon peaks appear where the electron gas model suggests, in the range 1.2-2.0 eV for x varying from 0.16 to 0.50.

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Section: Reflectivity Spectrumsupporting

confidence: 61%

Section: A Handling Of the Intraband Partmentioning

confidence: 98%

Section: Lixzrncl Within Vcamentioning

confidence: 98%

mentioning

confidence: 98%

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Dielectric response of electron-doped ionic superconductorLixZrNCl

Botana

Pickett

2014

Phys. Rev. B

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“…The overall electronic structure has been investigated by optical spectroscopy technique for Li x ZrNCl system with different Li concentrations [17,18]. The reflectivity for the undoped compound shows a typical spectral shape for an insulator, namely, almost frequency-independent low reflectivity for below 3 eV, accompanied by spiky structures below 0.1 eV due to phonons, and a conspicuous peak around 3.7 eV due to interband transition.…”

Section: Optical Spectroscopymentioning

confidence: 99%

Unconventional superconductivity in electron-doped layered metal nitride halides MNX (M= Ti, Zr, Hf; X= Cl, Br, I)

Kasahara

Kuroki

Yamanaka

et al. 2015

Physica C: Superconductivity and its Applications

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Unconventional superconductivity in electron-doped layered metal nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I) AbstractIn this review, we present a comprehensive overview of superconductivity in electron-doped metal nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I) with layered crystal structure and two-dimensional electronic states. The parent compounds are band insulators with no discernible long-range ordered state. Upon doping tiny amount of electrons, superconductivity emerges with several anomalous features beyond the conventional electron-phonon mechanism, which stimulate theoretical investigations. We will discuss experimental and theoretical results reported thus far and compare the electron-doped layered nitride superconductors with other superconductors.

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Two-dimensional superconducting nature of Bi₂Sr₂CaCu₂O_8+δ thin films revealed by BKT transition

Zhang,

Kang,

Liu

et al. 2023

RSC Adv.

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Optical properties of layered superconductor LixZrNCl

Cited by 10 publications

References 26 publications

Dielectric response of electron-doped ionic superconductorLixZrNCl

Dielectric response of electron-doped ionic superconductorLixZrNCl

Unconventional superconductivity in electron-doped layered metal nitride halides MNX (M= Ti, Zr, Hf; X= Cl, Br, I)

Two-dimensional superconducting nature of Bi₂Sr₂CaCu₂O_8+δ thin films revealed by BKT transition

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Optical properties of layered superconductor LixZrNCl

Cited by 10 publications

References 26 publications

Dielectric response of electron-doped ionic superconductorLixZrNCl

Dielectric response of electron-doped ionic superconductorLixZrNCl

Unconventional superconductivity in electron-doped layered metal nitride halides MNX (M= Ti, Zr, Hf; X= Cl, Br, I)

Two-dimensional superconducting nature of Bi2Sr2CaCu2O8+δ thin films revealed by BKT transition

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Two-dimensional superconducting nature of Bi₂Sr₂CaCu₂O_8+δ thin films revealed by BKT transition