Measurements of the absolute value of the penetration depth in high-T[sub c] superconductors using a low-T[sub c] superconductive coating

Prozorov, R.; Giannetta, R. W.; Giannetta, R.W.; Carrington, A.; Fournier, P.; Greene, R. L.; Greene, R.L.; Guptasarma, P.; Hinks, D. G.; Hinks, D.G.; Banks, A. R.; Banks, A.R.
December 2000
Applied Physics Letters;12/18/2000, Vol. 77 Issue 25
Academic Journal
A method is presented to measure the absolute value of the London penetration depth, λ(T=0), from the frequency shift of a resonator. The technique involves coating a high-T[sub c] superconductor with film of low-T[sub c] material of known thickness and penetration depth. The method is applied to obtain λ(YBa[sub 2]Cu[sub 3]O[sub 7-δ])approx. 1460±150 Å, λ(Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+δ])approx. 2690±150 Å and λ(Pr[sub 1.85]Ce[sub 0.15]CuO[sub 4-δ])approx. 2790±150 Å. λ(YBa[sub 2]Cu[sub 3]O[sub 7-δ]) from this method is very close to that obtained by several other techniques. For both Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+δ] and Pr[sub 1.85]Ce[sub 0.15]CuO[sub 4-δ] the values exceed those obtained by other methods. © 2000 American Institute of Physics.


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