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<a href="mailto:tristan@jlab.org">Tristan Jones</a> has invited you to a meeting. <br>
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<span>(Join from computer or phone)</span>
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<b>Phone Dial-in</b><br>
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(<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.bluejeans.com_premium-2Dnumbers&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Go5UENzgixVXor8yH3HGLOkEsnbRfYycfEmE4poGuxo&m=66Y0wFOcnuykuRqW3KJAeE08az8nc2kViE6SnL47MvY&s=-vwMNmeDCauv_QsZfbAAMbPi2Yie63bk8P8f9q6IXe8&e=">Global Numbers</a>)<br><br>
Meeting ID: 115 272 641<br>
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<b>Room System</b><br>
199.48.152.152 or bjn.vc<br><br>
Meeting ID: 115 272 641<br>
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<span style="color:#666666">Description:</span><br>
Microwave studies of the surface impedance of superconductors in the mixed state<br /><br />Abstract<br />In this talk I will first describe the microwave techniques and methods that we use in our<br />group to measure the surface impedance in superconductors in d.c. fields in the 0.1-10 T<br />range. Namely, the use of mono- and dual- frequency dielectric resonators through the<br />surface perturbation technique and the Corbino disk wide band technique will be<br />introduced. Then, after a brief overview of the main aspects of the high frequency vortex<br />dynamics, I will present a selection of our recent research. I will illustrate results on<br />various vortex parameters – flux flow resistivity, pinning constant, pinning frequency,<br />thermal creep factor – and the effect of the material electron mass anisotropy and pinning<br />anisotropy. Various materials will be dealt with: thin film and coated conductors<br />YBa2Cu3O7-δ, showing how the introduction of artificial pinning centers improve the<br />pinning properties also at microwave<br />
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<span style="color:#666666">Want to test your video connection?</span><br>
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