Measurements of critical magnetic fields and resistance for a phase Mo-Re

doi:10.1016/0022-5088(80)90293-3

Journal of the Less Common Metals

Volume 69, Issue 2, February 1980, Pages 361-367

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Abstract

Measurements of the critical magnetic fields and the electrical resistance for σ phase alloys of the Mo_1−xRe_itx (0.55 ⩽ x ⩽ 0.7) system are reported. The variation of T_c lies within 0.5 K for various compositions and heat treatments. The extrapolated upper critical magnetic fields H_c2(0) are between 22.6 and 36.0 kG. A splat-quenched alloy of composition Mo-62at.%Re has an H_c2(0) value of 27.1 kG. Thus atomic disorder does not influence H_c2(0) significantly. The H_c2(0) values agree in general with the calculated H_c2^∗∗(0) values where paramagnetic effects have been included. The resistance ratio varies as T³ in the low temperature region, then has a negative curvature (50 – 150K) and the curve is less than linear in T at temperatures above 150 K. This behaviour is similar to that of many other d and f band superconductors and can be explained by a modified s-d model.

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Citation Excerpt :
Narrow isothermal M(H)-hysteresis curves similar to the present alloys have been observed both in the polycrystalline [15] and single crystal MgB2 samples [16]. In these materials, the narrow width of the hysteresis, is thought to be arising due to weak pinning [15] and the lack of defects (flux line pinning centers) [16]. In such a case, the M− curve lies close to the equilibrium magnetization (MEq) and thus exhibits negative values.
We have measured the isothermal field dependence of magnetization of the Mo₁₀₀₋_xRe_x (15 ⩽ x ⩽ 48) alloys, and have estimated the critical current and pinning force density from these measurements. We have performed structural characterization of the above alloys using standard techniques, and analyzed the field dependence of critical current and pinning force density using existing theories. Our results indicate that dislocation networks and point defects like voids and interstitial imperfections are the main flux line pinning centers in the Mo₁₀₀₋_xRe_x alloys in the intermediate fields, i.e., in the “small bundle” flux line pinning regime. In this regime, the critical current density is also quite robust against increasing magnetic field. In still higher fields, the critical current density is affected by flux creep. In the low field regime, on the other hand, the pinning of the flux lines seems to be influenced by the presence of two superconducting energy gaps in the Mo₁₀₀₋_xRe_x alloys. This modifies the field dependence of critical current density, and also seems to contribute to the asymmetry in the magnetic irreversibility exhibited by the isothermal field dependence of magnetization.
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Measurements of critical magnetic fields and resistance for a phase Mo-Re

Abstract

Physics

Phys. Status Solidi B

Phys. Status Solidi B

Appl. Phys.

Appl. Phys.

Appl. Phys.

IBM J. Res. Dev.

Phys. Kondens. Mater.

Phys. Rev., Sect. B

Solid State Commun.