Dominant 
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-wave superconducting gap in 
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 observed by tunneling spectroscopy on side junctions

Voerman, Joris Anthonie; Boer, Jorrit Cornelis de; Hashimoto, Takahiro; Huang, Yingkai; Li, Chuan; Brinkman, Alexander

doi:10.1103/physrevb.99.014510

Cited by 23 publications

(26 citation statements)

References 33 publications

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“…Lower panel: Ac-susceptibility at p = 2.07 GPa measured in applied magnetic fields. Curves from right to left in 0 mT to 7 mT with 1 mT steps and in10,13,16,19,22, 25 and 28 mT.…”

mentioning

confidence: 99%

Superconductivity under pressure in the Dirac semimetal PdTe₂

Leng

Ohmura

Anh

et al. 2019

J. Phys.: Condens. Matter

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The Dirac semimetal PdTe2 was recently reported to be a type-I superconductor (Tc =1.64 K, µ0Hc(0) = 13.6 mT) with unusual superconductivity of the surface sheath. We here report a high-pressure study, p ≤ 2.5 GPa, of the superconducting phase diagram extracted from acsusceptibility and transport measurements on single crystalline samples. Tc(p) shows a pronounced non-monotonous variation with a maximum Tc =1.91 K around 0.91 GPa, followed by a gradual decrease to 1.27 K at 2.5 GPa. The critical field of bulk superconductivity in the limit T → 0, Hc(0, p), follows a similar trend and consequently the Hc(T, p)-curves under pressure collapse on a single curve: Hc(T, p) = Hc(0, p)[1 − (T /Tc(p)) 2 ]. Surface superconductivity is robust under pressure as demonstrated by the large superconducting screening signal that persists for applied dc-fields Ha > Hc. Surprisingly, for p ≥ 1.41 GPa the superconducting transition temperature at the surface T S c is larger than Tc of the bulk. Therefore surface superconductivity may possibly have a non-trivial nature and is connected to the topological surface states detected by ARPES. We compare the measured pressure variation of Tc with recent results from band structure calculations and discuss the importance of a Van Hove singularity.

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“…Lower panel: Ac-susceptibility at p = 2.07 GPa measured in applied magnetic fields. Curves from right to left in 0 mT to 7 mT with 1 mT steps and in10,13,16,19,22, 25 and 28 mT.…”

mentioning

confidence: 99%

Superconductivity under pressure in the Dirac semimetal PdTe₂

Leng

Ohmura

Anh

et al. 2019

J. Phys.: Condens. Matter

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“…Peculiarly, from resistance measurements a critical field B R c (0) = 0.32 T was deduced. Weak-coupling conventional superconductivity in PdTe 2 was demonstrated via measurements of the heat capacity [12,15], penetration depth [16,17], scanning tunneling microscopy and spectroscopy (STM/STS) [9,18,19], and side junction tunneling spectroscopy [20]. Superconductivity is partly attributed to a van Hove singularity situated at ∼ 30 meV above the Fermi level [21,22].…”

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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“…The superconducting properties of PdTe 2 have been widely investigated at ambient pressure [7,8,[10][11][12][13][14][15][16][17][18][19]. PdTe 2 is a type-I superconductor with T c = 1.64 K and its critical field µ 0 H c (T ) follows the standard quadratic temperature variation with µ 0 H c (0) = 13.6 mT [10].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it is considered that a saddle-point van Hove singularity (vHs) near the * E-mail: ohmura@phys.sc.niigata-u.ac.jp M -point in the Brillouin zone, which is located about 30 meV above the Fermi level [20], plays an important role in the conventional Bardeen-Cooper-Schrieffer (BCS) behavior [14]. Meanwhile, as regards the surface states of PdTe 2 , its superconducting properties are under discussion [7,8,10,[15][16][17]. Leng et al observed an unusual surface sheath superconductivity in ac-susceptibility measurements in magnetic fields [10].…”

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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Dominant s -wave superconducting gap in PdTe2 observed by tunneling spectroscopy on side junctions

Cited by 23 publications

References 33 publications

Superconductivity under pressure in the Dirac semimetal PdTe₂

Superconductivity under pressure in the Dirac semimetal PdTe₂

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

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

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Dominant s -wave superconducting gap in PdTe2 observed by tunneling spectroscopy on side junctions

Cited by 23 publications

References 33 publications

Superconductivity under pressure in the Dirac semimetal PdTe2

Superconductivity under pressure in the Dirac semimetal PdTe2

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

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

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Superconductivity under pressure in the Dirac semimetal PdTe₂

Superconductivity under pressure in the Dirac semimetal PdTe₂