abstract

• An original noncontact measurement technique to determine the phase transition for the superconductor Y Ba2 Cu3 Ox is described. A piezoelectric is used to vibrate the sample normal to the superconductor surface, and a small coil which has a permanent magnet adhered to it, or an electromagnetic acoustic transducer (EMAT) for out-of-plane waves, is used to detect (by means of standard lock-in techniques) these vibrations, both on the Ohmic and the superconducting regimes as temperature is lowered. The magnitude of the induced voltage (by eddy currents) on the EMAT is plotted against temperature (T), and the changes in the conductivity in the Ohmic regime as well as during the superconducting transition (88.7

authors

• Acosta M.
• Dutton B.
• Gamboa-Perera F.
• Nahmad Molinari Yuri

publication date

• 2006-01-01

published in

• Review of Scientific Instruments  Journal

keywords

• Acoustic transducers; Electron transport properties; Magnetoelectric effects; Permanent magnets; Phase transitions; Piezoelectricity; Yttrium compounds; Electromagnetic acoustic transducer (EMAT); Noncontact measurement; Out-of-plane waves; Superconducting magnets

Digital Object Identifier (DOI)

• 10.1063/1.2173070

start page

end page

volume

• 77

issue

• 3