Specific heat of MgB2 after irradiation
@article{Wang2002SpecificHO, title={Specific heat of MgB2 after irradiation}, author={Yuxing Wang and Fr{\'e}d{\'e}ric Bouquet and I. Sheikin and Pierre Toulemonde and Bernard Revaz and Michael Eisterer and Harald W. Weber and Joerg Hinderer and Alain F. Junod}, journal={Journal of Physics: Condensed Matter}, year={2002}, volume={15}, pages={883-893} }
We studied the effect of disorder on the superconducting properties of polycrystalline MgB2 by specific-heat measurements. In the pristine state, these measurements give a bulk confirmation of the presence of two superconducting gaps with 2Δ0/kBTc = 1.3 and 3.9 with nearly equal weights. The scattering introduced by irradiation suppresses Tc and tends to average the two gaps although less than predicted by theory. We also found that by a suitable irradiation process by fast neutrons, a…
Tables from this paper
38 Citations
Specific heat of MgB2 after irradiation
- Physics
- 2003
We studied the effect of disorder on the superconducting properties of polycrystalline MgB2 by specific-heat measurements. In the pristine state, these measurements give a bulk confirmation of the…
Evolution of the structure and properties of the MgB2 superconductor under isothermal annealing
- Physics
- 2005
The effect of comparatively weak actions on the structure of the two-gap BCS superconductor MgB2 was studied. The MgB2 samples studied differed in terms of the annealing time at 900°C. It was found…
Effects of neutron irradiation on carbon doped MgB2 wire segments
- Physics
- 2006
We have studied the evolution of superconducting and normal state properties of neutron irradiated Mg(B0.962C0.038)2 wire segments as a function of post-exposure annealing time and temperature. The…
Radiation damaged MgB2: a comparison with A15 superconductors
- Physics
- 2008
In the present paper we discuss in detail experiments of radiation damage and their effects on MgB2 properties (Tc, resistivity, critical field, gap), making constant reference to similar experiments…
Superconducting properties of nanocrystalline MgB2
- Physics, Materials Science
- 2006
Nanocrystalline MgB2 produced by mechanical alloying has been shown to exhibit enhanced superconducting properties such as increased pinning and higher critical currents. However, the effects of the…
Radiation effects on MgB2: a review and a comparison with A15 superconductors
- Physics
- 2008
The study of the effects of irradiation damage in superconducting materials is crucial for the twofold aim of helping to understand the nature of superconductivity and of improving the…
Magnetic properties and critical currents of MgB2
- Physics
- 2007
This review focuses on the superconducting properties of MgB2 that are relevant for power applications. The reversible mixed state parameters are the most important, since they define the limiting…
Control of superconductivity in MgB2 by ion bombardment
- PhysicsJournal of Physics D: Applied Physics
- 2019
The superconducting properties of MgB2 can be modified via controlled introduction of lattice defects by ion bombardment. Here, magnetometry and Raman spectroscopy are used to study ∼160 nm-thick…
References
SHOWING 1-10 OF 33 REFERENCES
Specific heat of MgB2 after irradiation
- Physics
- 2003
We studied the effect of disorder on the superconducting properties of polycrystalline MgB2 by specific-heat measurements. In the pristine state, these measurements give a bulk confirmation of the…
Evidence for two superconducting energy gaps in MgB(2) by point-contact spectroscopy.
- PhysicsPhysical review letters
- 2001
Evidence is obtained for two distinct superconducting energy gaps in the multiband model of the superconductivity in the recently discovered system MgB(2) with the transition temperature T(c) = 39 K by means of Andreev reflection.
Specific heat of single crystal MgB2: a two-band superconductor with two different anisotropies.
- PhysicsPhysical review letters
- 2002
Heat-capacity measurements of a 39 microg MgB2 single crystal in fields up to 14 T and below 3 K allow the determination of the low-temperature linear term of the specific heat, its field dependence,…
Phenomenological two-gap model for the specific heat of MgB2
- Physics
- 2001
The authors show that the specific heat of the superconductor MgB{sub 2} in zero field, for which significant non-BCS features have been reported, can be fitted, essentially within experimental…
Field Dependence of Electronic Specific Heat in Two-Band Superconductors
- Physics
- 2002
The vortex structure is studied in light of MgB 2 theoretically based on a two-band superconducting model by means of Bogoliubov-de Gennes framework. The field dependence of the electronic specific…
Temperature and field dependence of the anisotropy of MgB2.
- PhysicsPhysical review letters
- 2002
The anisotropy gamma of the superconducting state of high quality single crystals of MgB2 was determined, using torque magnetometry with two different methods, finding the unusual temperature dependence and can be explained by nonlocal effects of anisotropic pairing and/or the k--> dependence of the effective mass tensor.
Enhancement of the high-magnetic-field critical current density of superconducting MgB2 by proton irradiation
- PhysicsNature
- 2001
It is shown that modest levels of atomic disorder induced by proton irradiation enhance the pinning of vortices, thereby significantly increasing Jc at high field strengths, and it is anticipated that either chemical doping or mechanical processing should generate similar levels of disorder, and so achieve performance that is technologically attractive in an economically viable way.
Boron isotope effect in superconducting MgB2.
- PhysicsPhysical review letters
- 2001
The preparation method of and boron isotope effect for MgB2, a new binary intermetallic superconductor with a remarkably high superconducting transition temperature T(c)(10B) = 40.2 K, is reported, consistent with the material being a phonon-mediated BCSsuperconductor.
Specific heat of MgB2 in a one- and a two-band model from first-principles calculations
- Physics
- 2002
The heat capacity anomaly at the transition to superconductivity of the layered superconductor MgB2 is compared to first-principles calculations with the Coulomb repulsion, µ*, as the only parameter…
Exponential temperature dependence of the penetration depth in single crystal MgB2.
- PhysicsPhysical review letters
- 2002
The temperature dependence of the London penetration depth, lambda(T), was measured in both single crystal and polycrystalline MgB2 samples by a high-resolution, radio frequency technique and it is found that the data are best described by a two-gap model.