Electronic transport properties of intermediately coupled superconductors: PdTe2and Cu0.04PdTe2

Hooda, M. K.; Yadav, C. S.

doi:10.1209/0295-5075/121/17001

Cited by 33 publications

(38 citation statements)

References 41 publications

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“…1(c,d) show the c-axis [00l] orientation of the platelets. For both compositions, PdTe 2 and Cu 0.05 PdTe 2 , the data analysis indicates that the crystal structure and the lattice parameters obtained are consistent with previous reports [25]. In Cu 0.05 PdTe 2 , we observed a minute shift of peak positions, attributed to a small reduction of the Pd-Te bond length [16].…”

Section: Sample Synthesis Methodssupporting

confidence: 91%

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Anomalous charge transport of superconducting Cu$_{x}$PdTe$_2$ under high pressure

Yang,

Hooda,

Yadav

et al. 2021

Preprint

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By means of high-pressure resistivity measurements on single crystals, we investigate the charge transport properties of Cu x PdTe 2 , notable for the combination of topological type-II Dirac semimetallic properties with superconductivity up to T c = 2.5 K. In both cases of pristine (x = 0) and intercalated (x = 0.05) samples, we find an unconventional T 4 power law behavior of the low-temperature resistivity visible up to ∼40 K and remarkably stable under pressure up to 8.2 GPa. This observation is explained by the low carrier density n, which strongly reduces the k-region available for electron-phonon scattering, as previously reported in other low-n two-dimensional systems, such as multilayer graphene and semiconductor heterostructures.Our data analysis complemented by specific heat measurements and supported by previous quantum oscillation studies and ab initio calculations suggests a scenario of one-band charge transport. Within this scenario, our analysis yields a large value of transport electron-phonon coupling constant λ tr = 1.2 at ambient pressure that appears to be strongly enhanced by pressure assuming a constant effective mass.

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Section: Sample Synthesis Methodssupporting

confidence: 91%

“…In good agreement with Ref. [25,27], the fit yields γ = 5.46 (7) Using the Fermi liquid expression γ = π 2 k 2 B D(E F )/3, we obtain a density of states at the Fermi level of D(E F ) = 2.31 eV −1 f.u. −1 and 2.43 eV −1 f.u.…”

Section: Specific Heatsupporting

confidence: 87%

Anomalous charge transport of superconducting Cu$_{x}$PdTe$_2$ under high pressure

Yang,

Hooda,

Yadav

et al. 2021

Preprint

Self Cite

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“…However, the variation of n does not explain T c (P ) because n shows only a slight increase as a function of pressure [25]. On the other hand, an enhancement of T c is also reported in studies on Cu-intercalated Cu x PdTe 2 (T max c = 2.6 K for x = 0.06) [27] and the Au-substituted series Au 1−x Pd x Te 2 (T max c = 4.65 K for x = 0.40) [28]. We traced the relative change of T c as a function of the relative volume change in Fig.…”

Section: Introductionmentioning

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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“…Ryu investigated Cu doping in PdTe 2 by preparing a series of Cu x PdTe 2 samples [29]. Optimal doping was found near x = 0.05 with bulk superconductivity at T c ≈ 2.6 K [29,30]. The increase of T c is attributed to an increase in the DOS at the Fermi level due to the hybridization of Te-p and Cu-d orbitals along the c-axis, effectively reducing the 2D-nature of this layered material.…”

Section: Introductionmentioning

confidence: 99%

Disorder induced transition from type-I to type-II superconductivity in the Dirac semimetal PdTe$_2$

Salis,

Lorenz,

Huang

et al. 2022

Preprint

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We report a doping study directed to intentionally induce disorder in PdTe2 by the isoelectronic substitution of Pt. Two single-crystalline batches Pd1−xPtxTe2 have been prepared with nominal doping concentrations x = 0.05 and x = 0.10. Sample characterization by energy dispersive x-ray spectroscopy (EDX) revealed Pt did not dissolve homogeneously in the crystals. For the nominal value x = 0.10 small single crystals cut from the batch appeared to have x = 0.09, as well as the non stoichiometric composition Pd0.97Pt<0.004Te2.03. Magnetic and heat capacity measurements demonstrate a transition from type-I to type-II superconducting behavior upon increasing disorder. From transport measurements we calculate a residual resistivity ρ0 = 1.4 µΩcm suffices to turn PdTe2 into a superconductor of the second kind.

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Electronic transport properties of intermediately coupled superconductors: PdTe₂and Cu_0.04PdTe₂

Cited by 33 publications

References 41 publications

Anomalous charge transport of superconducting Cu$_{x}$PdTe$_2$ under high pressure

Anomalous charge transport of superconducting Cu$_{x}$PdTe$_2$ under high pressure

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

Disorder induced transition from type-I to type-II superconductivity in the Dirac semimetal PdTe$_2$

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