Energy gap and upper critical field of the new magnetic superconductor Mo<sub>3</sub>Sb<sub>7</sub>found by the Andreev reflection method

Dmitriev, V. M.; Rybaltchenko, L. F.; Ishchenko, L. A.; Khristenko, E. V.; Bukowski, Z.; Troć, R.

doi:10.1088/0953-2048/19/6/026

Cited by 15 publications

(23 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[7,8] As far as the superconducting pairing mechanism is concerned, there is no agreement whether Mo 3 Sb 7 is a typical s-wave electron-phonon (BCS) superconductor or some more complex state is realized. Most of the published results [2,3,[9][10][11], including first principles calculations for the cubic phase, [11] support the conventional * email: wiendlocha@fis.agh.edu.pl…”

Section: Introductionmentioning

confidence: 67%

See 1 more Smart Citation

Effect of the tetragonal distortion on the electronic structure, phonons and superconductivity in the Mo3Sb7 superconductor

Wiendlocha

Sternik

2014

Intermetallics

View full text Add to dashboard Cite

Effect of tetragonal distortion on the electronic structure, dynamical properties and superconductivity in Mo3Sb7 is analyzed using first principles electronic structure and phonon calculations. Rigid muffin tin approximation (RMTA) and McMillan formulas are used to calculate the electron-phonon coupling constant λ and superconducting critical temperature. Our results show, that tetragonal distortion has small, but beneficial effect on superconductivity, slightly increasing λ, and the conclusion that the electron-phonon mechanism is responsible for the superconductivity in Mo3Sb7 is supported. The spin-polarized calculations for the ordered (ferromagnetic or antiferromagnetic), as well as disordered (disordered local moment) magnetic states yielded non-magnetic ground state. We point out that due to its experimentally observed magnetic properties the tetragonal Mo3Sb7 might be treated as noncentrosymmetric superconductor, which could have influence for the pairing symmetry. In this context the relativistic band structure is calculated and spin-orbit interaction effects are discussed.

show abstract

Section: Introductionmentioning

confidence: 67%

“…It is a type II superconductor, [1,2] with the relatively low critical temperature T c 2.2 K. At room temperature, it has a cubic bcc structure (space group Im3m) of the Ir 3 Ge 7 type. The primitive cell of Mo 3 Sb 7 contains two formula units, i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of the tetragonal distortion on the electronic structure, phonons and superconductivity in the Mo3Sb7 superconductor

Wiendlocha

Sternik

2014

Intermetallics

View full text Add to dashboard Cite

show abstract

“…[1,2] concluded the BCS-type behaviour of the superconductor. However, in the recent work, Dmitriev et al [3] had suggested that Mo 3 Sb 7 is not a trivial BCS (s-wave) superconductor but rather it has a (s+g)-wave or another unconventional pairing symmetry.…”

Section: Introductionmentioning

confidence: 97%

“…Based on the magnetization [1], and point-contact (PC) Andreev-reflection data [2], the authors of Ref. [1,2] concluded the BCS-type behaviour of the superconductor.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature specific heat of the superconductor Mo3Sb7

2008

View full text Add to dashboard Cite

The low-temperature specific heat of a superconductor Mo 3 Sb 7 with T c = 2.25 ±0.05 K has been measured in magnetic fields up to 5 T. In the normal state, the electronic specific heat coefficient γ n , and the Debye temperature Θ D are found to be 34.5(2) mJ/molK 2 and 283(5) K, respectively.The enhanced γ n value is interpreted due to a narrow Mo-4d band pinned at the Fermi level. The electronic specific heat in the superconducting state can be analyzed in terms a phenomenological two BCS-like gap model with the gap widths 2∆ 1 /k B T c = 4.0 and 2∆ 2 /k B T c = 2.5, and relative weights of the mole electronic heat coefficients γ 1 /γ n = 0.7 and γ 2 /γ n = 0.3. Some characteristic thermodynamic parameters for the studied superconductor, like the specific heat jump at T c , ∆C(T c )/γ n T c , the electron-phonon coupling constant, λ e−ph , the upper H c2 and thermodynamic critical H c0 fields, the penetration depth λ, coherence length ξ and the Ginzburg-Landau parameter κ are evaluated. The estimated values of parameters like 2∆ 0 /k B T c , ∆C(T c )/γ n T c , N (E F ), and λ e−ph suggest that Mo 3 Sb 7 belongs to intermediate-coupling regime. The electronic band structure calculations indicate that the density of states near the Fermi level is formed mainly by the Mo-4d orbitals and there is no overlapping between the Mo-4d and Sb-sp orbitals.

show abstract

“…This interesting property has been documented on the basis of magnetic susceptibility, electrical resistivity [1] and point-contact (PC) Andreev-reflection [2] experiments on a single crystal. Up to now, there have been several studies pointing towards the nature of the pairing mechanism.…”

Section: Introductionmentioning

confidence: 96%

Synthesis and Characterization of the Superconductor Mo₃Sb₇

Tran

Bukowski

2008

Acta Phys. Pol. A

View full text Add to dashboard Cite

We synthesized a polycrystalline sample of the superconductor Mo 3 Sb 7 and characterized its basic properties by measurements of magnetization, electrical resistivity and specific heat. The measurements establish a superconducting phase transition at T c = 2.25(0.05) K. In applied magnetic fields, the magnetization and resistivity show the behavior of type-II superconductor. From the specific heat measurement, the electronic specific heat coefficient, γ, specific heat jump at T c , ∆C(T c )/γT c , and the Debye temperature ΘD, are evaluated to be 34.5 mJ/(mol K 2 ), 1.56 and 283 K, respectively. From analysis of the specific heat data we suggest that this compound belongs to an intermediate strong coupling regime in the BCS context. The observed enhancement in the γ-value suggests a substantial contribution of Mo-4d-electrons to the density of states. Our experimental data do not support interpretation of superconductivity in Mo 3 Sb 7 in terms of neither unconventional superconductivity or spin fluctuations proposed previously.

show abstract

Energy gap and upper critical field of the new magnetic superconductor Mo₃Sb₇found by the Andreev reflection method

Cited by 15 publications

References 11 publications

Effect of the tetragonal distortion on the electronic structure, phonons and superconductivity in the Mo3Sb7 superconductor

Effect of the tetragonal distortion on the electronic structure, phonons and superconductivity in the Mo3Sb7 superconductor

Low-temperature specific heat of the superconductor Mo3Sb7

Synthesis and Characterization of the Superconductor Mo₃Sb₇

Contact Info

Product

Resources

About

Energy gap and upper critical field of the new magnetic superconductor Mo3Sb7found by the Andreev reflection method

Cited by 15 publications

References 11 publications

Effect of the tetragonal distortion on the electronic structure, phonons and superconductivity in the Mo3Sb7 superconductor

Effect of the tetragonal distortion on the electronic structure, phonons and superconductivity in the Mo3Sb7 superconductor

Low-temperature specific heat of the superconductor Mo3Sb7

Synthesis and Characterization of the Superconductor Mo3Sb7

Contact Info

Product

Resources

About

Energy gap and upper critical field of the new magnetic superconductor Mo₃Sb₇found by the Andreev reflection method

Synthesis and Characterization of the Superconductor Mo₃Sb₇