Vibrating-reed studies of flux pinning in the superconducting metallic glass Zr70Cu30

P. Esquinazi; J. Luzuriaga; C. Duran

doi:10.1103/PhysRevB.37.3689

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Vibrating-reed studies of flux pinning in the superconducting metallic glass Zr70Cu30

P. Esquinazi, J. Luzuriaga, C. Duran

DOI 10.1103/PhysRevB.37.3689 · Physical Review B

T1

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Abstract

With the vibrating-reed technique we have measured the resonance frequency and damping of superconducting ribbons of a Zr70Cu30 amorphous alloy as a function of magnetic field and temperature for different heat treatments of the same sample. Through these measurements we obtain the Labusch parameter α in the reduced-field (b) range 5×10−4b=0.1, α=(3.8×1011)Bc2(T)2.15 N m−4 T−2.15, a result which is in agreement with the absolute value and temperature dependence of the pinning force obtained from critical-current measurements. The effect of annealing below the glass transition temperature is to produce changes in α which depend on field and temperature in a complicated fashion. There are indications that surface pinning could be important in these samples.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Zr70Cu30 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.67	Pressure not reported	unknown
Zr70Pd30 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown