PrBa2Cu3O7-y: SUPERCONDUCTING OR ANOMALOUSLY MAGNETIC?

PrBa2Cu3O7−y: SUPERCONDUCTING OR ANOMALOUSLY MAGNETIC?

Ultrasonic Studies of Textured Superconducting Bi2Sr2CaCu2O8+y in Magnetic Fields

Measurements have been made of ultrasonic shear wave attenuation and sound velocity in highly textured polycrystalline samples of Bi~SrzCaCuzOs+,in magnetic fields up to 9 telsa and at temperatures down to 4.2 K. Magnetic field dependent attenuation peaks and velocity enhancements were found that are in good agreement with theoretical predictions based on the assumptions of the thermally assist...

Insulating PrBa2Cu3O7−δ and superconducting YBa2Cu3O7−δ: charge transfer modified by disorder

The (mostly) insulating behaviour of PrBa2Cu3O7−δ is still unexplained and even more interesting since the occasional appearance of superconductivity in this material. Since YBa2Cu3O7−δ is nominally iso-structural and always superconducting, we have measured the electron momentum density in these materials. We find that they differ in a striking way whereas LDA based calculations predict simila...

Heterogeneous Magnetic Superconducting Systems

Heterogeneous magnetic superconducting systems (HMSS) represent a new class of nanostructures. They are made of ferromagnetic (FM) and superconducting (SC) pieces separated by thin layers of insulating oxides. In contrast to the case of a homogeneous ferromagnetic superconductor studied during the last two decades, the two order parameters, the magnetization and the SC electron density do not s...

Superconducting magnetic energy storage

A Superconducting Magnetic Energy Storage (SMES) system stores energy in a superconducting coil in the form of a magnetic field. The magnetic field is created with the flow of a direct current (DC) through the coil. To maintain the system charged, the coil must be cooled adequately (to a “cryogenic” temperature) so as to manifest its superconducting properties – no resistance to the flow of cur...