Very-low-temperature tunneling spectroscopy in the heavy-fermion superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">PrOs</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sb</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Suderow, Hermann; Vieira, S.; Strand, Joel; Bud’ko, Sergey L.; Canfield, Paul C.

doi:10.1103/physrevb.69.060504

Cited by 76 publications

(72 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observation of a ZBP in Ref. [10] is in disagreement with another earlier tunneling conductance measurement [14], which found a spectrum similar to that of a fully gapped s-wave superconductor. The discrepancy could be accounted for if tunneling current in Ref.…”

Section: Point Contact Conductance In Pros 4 Sb 12contrasting

confidence: 51%

See 1 more Smart Citation

A General Model of N/S Conductance Spectroscopy in Non-Unitary Superconductors Applied to PrOs₄Sb₁₂

Curnoe¹,

Bohloul²,

Wei³

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

View full text Add to dashboard Cite

A formula for point contact conductance from a normal metal tip into a superconductor is derived using the Blonder-Tinkham-Klapwijk theory of Andreev reflection, with special emphasis on nonunitary superconductors. The results of point contact conductance spectroscopy performed on single crystals of PrOs 4 Sb 12 are compared with calculations for all symmetry-allowed superconducting gap functions of PrOs 4 Sb 12 . While a non-unitary superconducting phase is ruled out, various other possible superconducting phases can produce the main feature seen in the experiment, namely a zero-bias peak; among them the phase with symmetry C 3 × K agrees best with previous experimental results. In addition, two-band superconductivity is implied by the appearance of two distinct spectroscopic features.

show abstract

Section: Point Contact Conductance In Pros 4 Sb 12contrasting

confidence: 51%

“…The discrepancy could be accounted for if tunneling current in Ref. [14] was not in the [001] direction [10].…”

Section: Point Contact Conductance In Pros 4 Sb 12mentioning

confidence: 99%

A General Model of N/S Conductance Spectroscopy in Non-Unitary Superconductors Applied to PrOs₄Sb₁₂

Curnoe¹,

Bohloul²,

Wei³

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

View full text Add to dashboard Cite

show abstract

“…Contrastingly, the upper critical field is very reproducible, independent of samples and types of measurements. It has been analyzed with a strong coupling two-band model taking account of the spread in the effective masses of the quasiparticles and of the pairing strength as suggested also by STM spectroscopy measurements 9 . The strong influence of the paramagnetic limit on H c2 is the first experimental argument for a singlet superconducting order parameter.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, several types of experiments have already probed the nature of this superconducting state, but with apparently contradictory results. Concerning the gap topology, scanning tunneling spectroscopy measurements point to a fully open gap, with some anisotropy on the Fermi surface 9 . Indication of unconventional superconductivity might come from the distribution of values of the residual density of states (at zero energy) on different parts of the sample surface.…”

Section: Introductionmentioning

confidence: 99%

Superconducting phase diagram of the filled skuterruditePrOs4Sb12

et al. 2004

View full text Add to dashboard Cite

We present new measurements of the specific heat of the heavy fermion superconductor PrOs4Sb12, on a sample which exhibits two sharp distinct anomalies at Tc1 = 1.89K and Tc2 = 1.72K. They are used to draw a precise magnetic field-temperature superconducting phase diagram of PrOs4Sb12 down to 350 mK. We discuss the superconducting phase diagram of PrOs4Sb12 and its possible relation with an unconventional superconducting order parameter. We give a detailed analysis of Hc2(T ), which shows paramagnetic limitation (a support for even parity pairing) and multiband effects.

show abstract

“…The experimental setup, as described in previous work [22,23,24,25], is mechanically decoupled of external vibrations, has a resolution in energy of 15 µeV that has been previously tested by measuring clean spectra in low T c superconductors as such Al, and a mechanical pulling mechanism that allows to move the tip with respect to the sample holder. 2H-NbS 2 was synthesized as described elsewhere [26].…”

mentioning

confidence: 99%

Superconducting Density of States and Vortex Cores of 2H-NbS2

et al. 2008

Self Cite

View full text Add to dashboard Cite

Scanning tunneling microscopy and spectroscopy (STM/S) measurements in the superconducting dichalcogenide 2H-NbS2 show a peculiar superconducting density of states with two well defined features at 0.97 meV and 0.53 meV, located respectively above and below the value for the superconducting gap expected from single band s-wave BCS model (∆=1.76kBTc=0.9 meV). Both features have a continuous temperature evolution and disappear at Tc = 5.7 K. Moreover, we observe the hexagonal vortex lattice with radially symmetric vortices and a well developed localized state at the vortex cores. The sixfold star shape characteristic of the vortex lattice of the compound 2H-NbSe2 is, together with the charge density wave order (CDW), absent in 2H-NbS2.PACS numbers: 71.45. Lr, 74.25.Jb,74.50.+r,74.70.Ad The study of the coexistence of superconductivity with competing physical phenomena such as magnetic or charge order has historically produced great interest on the scientific community. Anisotropies or modulations of the superconducting properties (in real and/or reciprocal space) often appear as a consequence of competing orders within the same system [1,2]. In the compound 2H-NbSe 2 , superconductivity appears within a CDW state (T CDW =33K and T c =7.2 K) [3]. Low lying excitations measured deep in the superconducting state long time ago by specific heat [4,5] have been explained by recent experiments and theoretical calculations with a multiband superconductivity and a peculiar anisotropy of the superconducting gap [6,7]. Recent angular resolved photoemission spectroscopy measurements demonstrate that the superconducting gap has, close to T c (at 5.7 K), largest values at k-space positions connected with CDW wavevectors [8,9]. Hess et al. [10,11,12] found that the local superconducting density of states (LDOS) at the center of the vortex core shows a high peak close to the Fermi level highlighting the lowest quasiparticle state bound within the vortex core well [13]. Around the vortex core, the LDOS is far from respecting in-plane symmetry and intriguing vortex lattice images with patterns showing strong in-plane LDOS modulations are obtained [10,11,12]. 2H-NbSe 2 belongs to the transition-metal dichalcogenides (2H-MX 2 with M = Ta, Nb and X = Se, S), a family of systems which is unique to study the interplay between CDW order and superconductivity. The 2H-MX 2 compounds share a double layered structure made of two hexagonal X sheets with an intercalated M sheet (X-M-X), connected through very weak van der Waals bonds [14]. This produces highly anisotropic, quasi two dimensional electronic properties. The features of the Fermi Surface (FS) expected to be common in all systems of the series are two concentric cylindrical FS sheets centered on both Γ and K points, derived from the transition-metal d bands [15,16,17,18]. When going over the series from 2H-TaSe 2 and 2H-TaS 2 to 2H-NbSe 2 and 2H-NbS 2 , the ratio of the intralayer lattice constant with the interlayer distance a/c increases, as well as T c , whereas T CDW decreas...

show abstract

Very-low-temperature tunneling spectroscopy in the heavy-fermion superconductorPrOs4Sb12

Cited by 76 publications

References 26 publications

A General Model of N/S Conductance Spectroscopy in Non-Unitary Superconductors Applied to PrOs₄Sb₁₂

A General Model of N/S Conductance Spectroscopy in Non-Unitary Superconductors Applied to PrOs₄Sb₁₂

Superconducting phase diagram of the filled skuterruditePrOs4Sb12

Superconducting Density of States and Vortex Cores of 2H-NbS2

Contact Info

Product

Resources

About

Very-low-temperature tunneling spectroscopy in the heavy-fermion superconductorPrOs4Sb12

Cited by 76 publications

References 26 publications

A General Model of N/S Conductance Spectroscopy in Non-Unitary Superconductors Applied to PrOs4Sb12

A General Model of N/S Conductance Spectroscopy in Non-Unitary Superconductors Applied to PrOs4Sb12

Superconducting phase diagram of the filled skuterruditePrOs4Sb12

Superconducting Density of States and Vortex Cores of 2H-NbS2

Contact Info

Product

Resources

About

A General Model of N/S Conductance Spectroscopy in Non-Unitary Superconductors Applied to PrOs₄Sb₁₂

A General Model of N/S Conductance Spectroscopy in Non-Unitary Superconductors Applied to PrOs₄Sb₁₂