Silvanite AuAgTe<sub>4</sub>: a rare case of gold superconducting material

Amiel, Y.; Kafle, Gyanu P.; Komleva, Evgenia V.; Greenberg, Eran; Ponosov, Yu. S.; Chariton, Stella; Lavina, Barbara; Zhang, Dongzhou; Palevski, A.; Ушаков, А. В.; Mori, Hironori; Khomskii, Daniel I.; Mazin, I. I.; Streltsov, S. V.; Margine, E. R.; Rozenberg, G. Kh.

doi:10.1039/d3tc00787a

J. Mater. Chem. C

2023

DOI: 10.1039/d3tc00787a

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Silvanite AuAgTe₄: a rare case of gold superconducting material

Y. Amiel

Gyanu P. Kafle

Evgenia V. Komleva

et al.

Abstract: Gold is one of the most inert metals, forming very few compounds, and only a few of them are currently known to be superconducting. Here we have found yet another chemical compound of gold (and silver) that is superconducting.

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“…Cont. Mode at 103 cm −1 of Bi 2 Te 3[44] Mode at 105 cm −1 of Cu-doped Sb 2 Te 3[48] Mode at 102 cm −1 of AuAgTe 4[42] Mode at 98 cm −1 of Se-rich AuTe 2[49] Mode at 98 cm −1 of Bi 2 Te 3 Te vibration (116 cm −1 ) of Sb 2 Te 3[43] Modes at 117 and 121 cm −1 of AuSb 2[51] Mode at 120 cm −1 of Bi 2 Te 3 and mode at 112 cm −1 of Sb 2 Te 3[44] Mode at 120 cm −1 of Cu-doped Sb 2 Te 3[48] Mode at 117 cm −1[46] Mode at 112 cm −1 of Sb 2 Te 3[52] Mode at 119 cm −1[53] Mode at 120 cm −1[47] Mode at 116 cm −1 of Bi 2 Te 3[50] Modes 114 and 121 cm −1 of AuAgTe 4[42] 135Te-Te vibration (137 cm −1 ) of Sb 2 Te 3[43] Mode at 134 cm −1 of Bi 2 Te 3[44] Mode at 135 cm −1 of Cu-doped Sb 2 Te 3 Te vibration (162 cm −1 ) of Sb 2 Te 3[43] Modes at 155 and 162 cm −1 of AuSb 2[51] Mode at 158 cm −1 of AuAgTe 4[42] Mode at 160 cm −1 of Cu-doped Sb 2 Te 3[48] Mode at 159 cm −1 of AuSbTe[45] 177 171Mode at 172 cm −1 of AuTe 2[29] Mode at 176 cm −1 of Au 2.73 Te 6.23 Se 3.84[49] Mode at 174 to 178 cm −1 of synthetic Au 3 X 10 (X = Te, Se, S)…”

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Montbrayite from the Svetlinsk Gold–Telluride Deposit (South Urals, Russia): Composition Variability and Decomposition

Vikent’eva,

Shilovskikh,

Shcherbakov

et al. 2023

Minerals

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A rare gold–telluride montbrayite from the large Svetlinsk gold–telluride deposit (South Urals, Russia) was comprehensively studied using optical microscopy, scanning electron microscopy, electron microprobe analysis, reflectance measurements, electron backscatter diffraction, and Raman spectroscopy. Significant variations in the composition of the mineral were revealed (in wt%): Au 36.98–48.66, Te 43.35–56.53, Sb 2.49–8.10, Ag up to 4.56, Pb up to 2.04, Bi up to 0.33, Cu up to 1.42. There are two distinct groups with much more-limited variation within the observed compositional interval (in wt%): (1) Au 36.98–41.22, Te 49.35–56.53, Sb 2.49–5.57; (2) Au 47.86–48.66, Te 43.35–44.92, Sb 7.15–8.10. The empirical formula calculated on the basis of 61 apfu is Au16.43–23.28Sb1.79–6.09Te32.01–38.89Ag0–3.69Bi0–0.14Pb0–0.90Cu0–1.96. Two substitution mechanisms for antimony are proposed in the studied montbrayite grains: Sb→Au (2.5–5.6 wt% Sb) and Sb→Te (7–8 wt% Sb). The dependence of the reflection spectra and Raman spectra on the antimony content and its substitution mechanism, respectively, was found in the mineral. The slope of the reflectance spectra decreases and the curve in the blue–green region of the spectrum disappears with increasing Sb content in montbrayite. Raman spectra are reported for the first time for this mineral. The average positions of the peak with high-intensity are ~64 cm−1 and ~90 cm−1 for montbrayite with Sb→Te and Sb→Au, respectively. Two grains of montbrayite demonstrate decomposition according to two schemes: (1) montbrayite (7 wt% Sb) → native gold + calaverite ± altaite, and (2) montbrayite (5 wt% Sb) → native gold + tellurantimony ± altaite. A combination of melting and dissolution–precipitation processes may be responsible for the formation of these decomposition textures.

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confidence: 99%

Montbrayite from the Svetlinsk Gold–Telluride Deposit (South Urals, Russia): Composition Variability and Decomposition

Vikent’eva,

Shilovskikh,

Shcherbakov

et al. 2023

Minerals

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Pressure-Induced Reversible Local Structural Disorder in Superconducting AuAgTe4

et al. 2023

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Here, we report results of the investigation of the lattice dynamics of the sylvanite mineral AuAgTe4 in a wide temperature and pressure range by Raman spectroscopy, together with the first-principle calculations. At ambient pressure, the experimental spectrum agrees well with the calculation data. The temperature behavior of the phonon self-energies (frequencies and linewidths) are described by an anharmonic mechanism and imply negligible contributions of electron–phonon interaction at low temperatures. A structural phase transition was recorded in the pressure range of 4–6 GPa, which is in accordance with theoretical predictions. At higher pressures, evidence of local structural disorder was found that made it possible to experimentally observe the spectrum of the density of vibrational states of AuAgTe4, which becomes superconducting under pressure.

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D-Wave Superconducting Gap Symmetry as a Model for Nb1−xMoxB2 (x = 0.25; 1.0) and WB2 Diborides

Talantsev

2023

Symmetry

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Recently, Pei et al. (National Science Review2023, nwad034, 10.1093/nsr/nwad034) reported that ambient pressure β-MoB2 (space group: R3¯m) exhibits a phase transition to α-MoB2 (space group: P6/mmm) at pressure P~70 GPa, which is a high-temperature superconductor exhibiting Tc=32 K at P~110 GPa. Although α-MoB2 has the same crystalline structure as ambient-pressure MgB2 and the superconducting critical temperatures of α-MoB2 and MgB2 are very close, the first-principles calculations show that in α-MoB2, the states near the Fermi level, εF, are dominated by the d-electrons of Mo atoms, while in MgB2, the p-orbitals of boron atomic sheets dominantly contribute to the states near the εF. Recently, Hire et al. (Phys. Rev. B2022, 106, 174515) reported that the P6/mmm-phase can be stabilized at ambient pressure in Nb1−xMoxB2 solid solutions, and that these ternary alloys exhibit Tc~8 K. Additionally, Pei et al. (Sci. China-Phys. Mech. Astron. 2022, 65, 287412) showed that compressed WB2 exhibited Tc~15 K at P~121 GPa. Here, we aimed to reveal primary differences/similarities in superconducting state in MgB2 and in its recently discovered diboride counterparts, Nb1−xMoxB2 and highly-compressed WB2. By analyzing experimental data reported for P6/mmm-phases of Nb1−xMoxB2 (x = 0.25; 1.0) and highly compressed WB2, we showed that these three phases exhibit d-wave superconductivity. We deduced 2Δm(0)kBTc=4.1±0.2 for α-MoB2, 2Δm(0)kBTc=5.3±0.1 for Nb0.75Mo0.25B2, and 2Δm(0)kBTc=4.9±0.2 for WB2. We also found that Nb0.75Mo0.25B2 exhibited high strength of nonadiabaticity, which was quantified by the ratio of TθTF=3.5, whereas MgB2, α-MoB2, and WB2 exhibited TθTF~0.3, which is similar to the TθTF in pnictides, A15 alloys, Heusler alloys, Laves phase compounds, cuprates, and highly compressed hydrides.

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Silvanite AuAgTe₄: a rare case of gold superconducting material

Abstract: Gold is one of the most inert metals, forming very few compounds, and only a few of them are currently known to be superconducting. Here we have found yet another chemical compound of gold (and silver) that is superconducting.

Cited by 3 publications

References 43 publications

Montbrayite from the Svetlinsk Gold–Telluride Deposit (South Urals, Russia): Composition Variability and Decomposition

Montbrayite from the Svetlinsk Gold–Telluride Deposit (South Urals, Russia): Composition Variability and Decomposition

Pressure-Induced Reversible Local Structural Disorder in Superconducting AuAgTe4

D-Wave Superconducting Gap Symmetry as a Model for Nb1−xMoxB2 (x = 0.25; 1.0) and WB2 Diborides

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Silvanite AuAgTe4: a rare case of gold superconducting material

Abstract: Gold is one of the most inert metals, forming very few compounds, and only a few of them are currently known to be superconducting. Here we have found yet another chemical compound of gold (and silver) that is superconducting.

Cited by 3 publications

References 43 publications

Montbrayite from the Svetlinsk Gold–Telluride Deposit (South Urals, Russia): Composition Variability and Decomposition

Montbrayite from the Svetlinsk Gold–Telluride Deposit (South Urals, Russia): Composition Variability and Decomposition

Pressure-Induced Reversible Local Structural Disorder in Superconducting AuAgTe4

D-Wave Superconducting Gap Symmetry as a Model for Nb1−xMoxB2 (x = 0.25; 1.0) and WB2 Diborides

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Product

Resources

About

Silvanite AuAgTe₄: a rare case of gold superconducting material