Multigap superconductivity in the charge density wave superconductor 
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Das, Debarchan; Gupta, Ritu; Bhattacharyya, A.; Biswas⃰, Pabitra Kumar; Adroja, D. T.; Hossain, Zakir

doi:10.1103/physrevb.97.184509

Cited by 20 publications

(18 citation statements)

References 56 publications

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“…Since, A ∝ N 2 (E F ) [30], this suggests that there is a maximum value of N (E F ) at this pressure. Together with the evidence that LaPt 2 Si 2 is a conventional electron-phonon mediated superconductor [21,26], then a peak in N (E F ) under pressure can lead to a superconducting dome, since T c ∝ ω D exp[-1/N (E F )V )] in BCS theory, where ω D is a phonon frequency, and V is the electron pairing potential. Note that ω D and V generally exhibit a more moderate pressure dependence compared to N (E F ) [31].…”

Section: Discussionmentioning

confidence: 96%

Evolution of charge density wave order and superconductivity under pressure in LaPt2Si2

Shen

et al. 2020

Phys. Rev. B

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We report measurements of the electrical resistivity and ac magnetic susceptibility of single crystalline LaPt2Si2 under pressure, in order to investigate the interplay of superconductivity and CDW order. LaPt2Si2 exhibits a first order phase transition from a tetragonal to orthorhombic structure, accompanied by the onset of CDW order below TCDW = 76 K, while superconductivity occurs at a lower temperature of Tc = 1.87 K. We find that the application of pressure initially suppresses the CDW transition, but enhances Tc. At pressures above 2.4 GPa, CDW order vanishes, while both Tc and the resistivity A-coefficient reach a maximum value around this pressure. Our results suggest that the occurrence of a superconducting dome can be accounted for within the framework of BCS theory, where there is a maximum in the density of states upon the closure of the CDW gap.

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Section: Discussionmentioning

confidence: 96%

Evolution of charge density wave order and superconductivity under pressure in LaPt2Si2

Shen

et al. 2020

Phys. Rev. B

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“…The research in the field of NC superconductors was triggered after the discovery of unusual superconducting ground state namely line nodes in heavy fermion compound CePt 3 Si [9]. Few other examples in this category are CeIrSi 3 [10], Mo 3 Al 2 C [16,17], Li 2 Pt 3 B [18,19] exhibits line nodes, whereas few others such as LaNiC 2 [20], (La,Y) 2 C 3 [21], LaPt 2 Si 2 [22], etc. show multiband SC.…”

Section: Introductionmentioning

confidence: 99%

Gap symmetry of the noncentrosymmetric superconductor W3Al2C

Gupta

Ying

et al. 2021

Phys. Rev. B

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A detailed zero-field and transverse-field muon spin relaxation/rotation (μSR) experiments have been carried out on the recently discovered noncentrosymmetric superconductor W 3 Al 2 C to speculate about its superconducting ground state. Bulk nature of superconductivity below 7.6 K is confirmed through magnetization and specific heat measurements. No change in the zero field μSR spectra collected above and below T c is visible, ruling out the possibility of spontaneous magnetic field below T c . This confirms that time-reversal symmetry is preserved for W 3 Al 2 C upon entering in the superconducting ground state. Temperature-dependent superfluid density [ρ s (T )], which directly reflects the superconducting gap symmetry is obtained by the analysis of spectra obtained from the transverse-field μSR experiments. Despite a noncentrosymmetric structure, W 3 Al 2 C adopts a fully gapped spin-singlet superconducting ground state as confirmed through the analysis of ρ s (T ) and C e (T ). The zero-temperature value of gap is 0 = 1.139(5) meV with gap-to-T c ratio 2 0 /k B T c ≈ 3.48, classifying this material as a weakly coupled superconductors. We have also revealed that the ratio T c /λ −2 eff is comparable to the class of unconventional superconductors, which points towards an unconventional pairing mechanism in W 3 Al 2 C.

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“…We carried out point-contact study on PdTe 2 using Ag tip. PdTe 2 is a known superconductor with a critical temperature (T c ) of 1.7 29,30 . Point contact spectra obtained in the thermal regime of transport are presented in Figure 8.…”

Section: Resultsmentioning

confidence: 99%

A modular point contact spectroscopy probe for sub-Kelvin applications

Das

Sheet

2019

Review of Scientific Instruments

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We present the construction and performance of a plug-n-play type point contact spectroscopy probe equipped with a piezo-driven coarse approach mechanism for sub-kelvin applications. A modular assembly has been built which can be placed in or taken out from a sub-Kelvin socket mounted inside a He3 cryostat (with a 7 Tesla magnet) using an external manipulator. A simple transfer process using a removable vertical manipulator combined with a load-lock chamber makes the exchange of the sample/tip rig very easy without breaking the vacuum insulation of the sample chamber. We have successfully performed point-contact spectroscopic studies on few elemental superconductors with low Tc. We have also used the probe to perform spectroscopic measurements on another low temperature superconductor PdTe2, which is a Dirac semimetal in the normal state. We present such data to demonstrate the functionality of the probe. The probe can also be made adaptable for other transport measurements such as Hall effect, four probe resistivity, scanning tunnelling spectroscopy etc.

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Multigap superconductivity in the charge density wave superconductor LaPt2Si2

Cited by 20 publications

References 56 publications

Evolution of charge density wave order and superconductivity under pressure in LaPt2Si2

Evolution of charge density wave order and superconductivity under pressure in LaPt2Si2

Gap symmetry of the noncentrosymmetric superconductor W3Al2C

A modular point contact spectroscopy probe for sub-Kelvin applications

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