Pressure-induced enhancement in the superconductivity of ZrTe<sub>3</sub>

Gu, Kemin; Susilo, Resta A.; Ke, Feng; Deng, Wen; Wang, Yanju; Zhang, Lingkong; Xiao, H.; Chen, Bin

doi:10.1088/1361-648x/aada53

Cited by 21 publications

(17 citation statements)

References 35 publications

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“…Observations of pressure-induced superconductivity in Ta 2 Se 8 I are in accordance with the results obtained on a number of quasi-1D transition metal chalcogenides in which suppression of the CDW-state leads to the emergence of superconductivity. [19][20][21][22][23][24] We find that the superconductivity in Ta 2 Se 8 I emerges only after the CDW-state is completely suppressed while the superconductivity and CDW transition coexist in related compounds, e.g. ZrTe 3 , orthorhombic-TaS 3 , NbSe 3 .…”

mentioning

confidence: 73%

Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal Ta$_2$Se$_8$I

Mu,

Nenno,

et al. 2020

Preprint

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A Weyl semimetal with strong electron-phonon interaction can show axionic coupling in its insulator state at low temperatures, owing to the formation of a charge density wave (CDW). Such a CDW emerges in the linear chain compound Weyl semimetal Ta 2 Se 8 I below 263 K, resulting in the appearance of the dynamical condensed-matter axion quasiparticle. In this study, we demonstrate that the interchain coupling in Ta 2 Se 8 I can be varied to suppress the CDW formation with pressure, while retaining the Weyl semimetal phase at high temperatures. Above 17 GPa, the Weyl semimetal phase does not survive and we induce superconductivity, due to the amorphization of the iodine sub-lattice. Structurally, the one-dimensional Ta-Se-chains remain intact and provide a superconducting channel in one dimension. We highlight that our results show a near-complete suppression of the gap induced by the axionic charge-density wave at pressures inaccessible to previous studies. Including this CDW phase, our experiments and theoretical predictions and analysis reveal the complete topological phase diagram of Ta 2 Se 8 I and its relationship to the nearby superconducting state. The results demonstrate Ta 2 Se 8 I to be a distinctively versatile platform for exploring correlated topological states.

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confidence: 73%

Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal Ta$_2$Se$_8$I

Mu,

Nenno,

et al. 2020

Preprint

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“…On the other hand, an increase in T c under pressure has been observed in several transition metal chalcogenides, e.g. M X 2 (M =Ni, Pd, Nb, X=S, Se, Te) and ZrTe 3 [38][39][40][41][42]. The effect of pressure on superconductivity has often been discussed based on the following points [3,43]: 1) the sign of dT c /dP depends on the magnitude of the Hopfield parameter η for electronic properties and the Grüneisen parameter γ for lattice hardening and 2) a variation of the energy bands near the Fermi energy (E F ) can contribute to a change in the density of states and also cause a pressure-induced electronic transition, which can alter the superconducting properties.…”

Section: Discussionmentioning

confidence: 99%

Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure

Furue,

Fujino,

Salis

et al. 2021

Preprint

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The transition metal dichalcogenide PdTe2 has attractive features based on its classification as a type-II Dirac semimetal and the occurrence of type-I superconductivity, providing a platform for discussion of a topological superconductor. Our recent work revealed that type-I superconductivity persists up to pressures of ∼ 2.5 GPa and the superconducting transition temperature Tc reaches a maximum at around 1 GPa, which is inconsistent with the theoretical prediction. To understand its non-monotonic variation and investigate superconductivity at higher pressures, we performed structural analysis by x-ray diffraction at room temperature below 8 GPa and electrical resistivity measurements at low temperatures from 1 to 8 GPa. With regard to the superconductivity beyond 1 GPa, the monotonic decrease in Tc is reproduced without any noticeable anomalies; Tc changes from 1.8 K at 1 GPa to 0.82 K at 5.5 GPa with dTc/dP ∼ −0.22 K/GPa. The crystal structure with spacegroup P 3m1 is stable in the pressure range we examined. On the other hand, the normalized pressure-strain analysis (finite strain analysis) indicates that the compressibility changes around 1 GPa, suggesting that a Lifshitz transition occurs. We here discuss the effect of pressure on the superconducting and structural properties based on the comparison of these experimental results.

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“…Ni, Pd, Nb; X = S, Se, Te) and ZrTe 3 [39][40][41][42][43]. The effect of pressure on superconductivity has often been discussed based on the following points [44,45]: (1) The sign of dT c /dP depends on the magnitude of the Hopfield parameter η for electronic properties and the Grüneisen parameter γ for lattice hardening, and (2) a variation of the energy bands near the Fermi energy E F can contribute to a change in the density of states and also cause a pressure-induced electronic transition, which can alter the superconducting properties.…”

Section: Discussionmentioning

confidence: 99%

Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure

et al. 2021

View full text Add to dashboard Cite

The transition metal dichalcogenide PdTe 2 has attractive features based on its classification as a type-II Dirac semimetal and the occurrence of type-I superconductivity, providing a platform for discussion of a topological superconductor. Our recent work revealed that type-I superconductivity persists up to pressures of ∼2.5 GPa and the superconducting transition temperature T c reaches a maximum at around 1 GPa, which is inconsistent with the theoretical prediction. To understand its nonmonotonic variation and investigate superconductivity at higher pressures, we performed structural analysis by x-ray diffraction at room temperature below 8 GPa and electrical resistivity measurements at low temperatures from 1 to 8 GPa. With regard to the superconductivity beyond 1 GPa, the monotonic decrease in T c is reproduced without any noticeable anomalies; T c changes from 1.8 K at 1 GPa to 0.82 K at 5.5 GPa with dT c /dP ∼ −0.22 K/GPa. The crystal structure with space group P 3m1 is stable in the pressure range we examined. On the other hand, the normalized pressure-strain analysis (finite strain analysis) indicates that the compressibility changes around 1 GPa, suggesting that a Lifshitz transition occurs. We here discuss the effect of pressure on the superconducting and structural properties based on the comparison of these experimental results.

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Pressure-induced enhancement in the superconductivity of ZrTe₃

Cited by 21 publications

References 35 publications

Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal Ta$_2$Se$_8$I

Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal Ta$_2$Se$_8$I

Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure

Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure

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Pressure-induced enhancement in the superconductivity of ZrTe3

Cited by 21 publications

References 35 publications

Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal Ta$_2$Se$_8$I

Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal Ta$_2$Se$_8$I

Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure

Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure

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Pressure-induced enhancement in the superconductivity of ZrTe₃