Investigation of the influence of a magnetic field on the chemical potential of electrons in superconducting and ferromagnetic thin films
V. I. Nizhankovskii, S. G. Zybtsev
DOI 10.1103/PhysRevB.50.1111 · Physical Review B
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Abstract
It is experimentally shown that measurements of the chemical-potential variation in a magnetic field could give valuable information about the magnetization of thin films. For superconducting single-crystal YBa2Cu3O7−δ thin films two kinds of behavior of μ(H) were observed depending on the substrate used. For films deposited on polished NdGaO3 single-crystal substrates the change of μ was mainly reversible. That means that no magnetic flux was trapped during a magnetic-field sweep. For films deposited on MgO, SrTiO3, and LaAlO3 single-crystal substrates μ changed irreversibly. The estimated critical current density is jc∼107 A/cm2 at T=4.2 K in both cases. Oscillations of μ in films evaporated on cleaved MgO substrates were observed. The effect of a magnetic field on μ in a ferromagnetic film, predicted 60 years ago, was confirmed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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