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- W2091248049 abstract "The microwave surface impedance $({Z}_{s}={R}_{s}+i{X}_{s})$ of in situ $mathrm{Mg}{mathrm{B}}_{2}$ thin films was measured as a function of temperature and parallel dc magnetic field at several frequencies between 5.7 and $18.5phantom{rule{0.3em}{0ex}}mathrm{GHz}$ using a dielectric resonator technique. The results are consistent with the expectations for a classical type-II superconductor and, consequently, quite different from those of the high-${T}_{c}$ cuprates. The films cooled in zero field revealed a clear indication of the lower critical field ${B}_{c1}$, with a small hysteresis around $Bensuremath{leqslant}{B}_{c1}$. In higher fields $(B>{B}_{c1})$, the losses followed the Coffey-Clem and Brandt model, including the frequency dependences, whereas high-${T}_{c}$ Y-Ba-Cu-O films did not show a reasonable agreement with this model. Both the relatively high values of $ensuremath{Delta}{X}_{s}∕ensuremath{Delta}{R}_{s}$ ratio and their frequency dependence indicate a weak effect of flux creep on the measured microwave loss in $mathrm{Mg}{mathrm{B}}_{2}$ films. The temperature dependence of $ensuremath{Delta}{X}_{s}∕ensuremath{Delta}{R}_{s}$ ratio can be described by a microscopic pinning model for BCS superconductors." @default.
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- W2091248049 date "2007-06-14" @default.
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- W2091248049 title "Effect of a dc magnetic field on the microwave losses in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Mg</mml:mi><mml:msub><mml:mi mathvariant=normal>B</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>thin films" @default.
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- W2091248049 doi "https://doi.org/10.1103/physrevb.75.212505" @default.
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