Associated Scientist: Chuck Mielke <cmielke@lanl.gov> or (505) 665-1500

We use rf techniques in high magnetic field to measure the penetration depth as a function of magnetic field and temperature in superconducting compounds. This techniques gives you the "change in penetration depth". The change in penetration depth as a function of magnetic field is known as the Campbell penetration depth. As the superconductivity is suppressed by the magnetic field the penetration depth goes to infinity and the measurement is actually sensing the conductivity.