Application Fields of High-Temperature Superconductors

Superconducting Materials — A Topical Overview

“…α → 2 for overdoping indicates the "normalisation" towards a regular Fermi liquid description of the normal state resistivity. 42 PCCO was selected for this experiment since a comparatively low, technically readily accessible H c2 ≤ 14 T is believed to allow a magnetic suppression of superconductivity [224]. However, even if such a magnetic field is sufficient to destroy the phase coherence of the Cooper pairs in HTS, the SC pairing appears to be rather insensitive to these fields [225].…”

“…Nevertheless, with the present progress of small cryocoolers [42] SC devices may evolve within foreseeable future to push-button black-box machines that may be one day as common practice as nowadays vacuum tube devices in ordinary living rooms 15 .…”

“…21 The microscopic distribution of oxygen [111] is neither easily observed [112,113,114] nor easily controlled [115]: Experimentally, oxygen content and distribution are adjusted by means of (oxygen partial) pressure, temperature and sufficient holding time to achieve thermal equilibrium [116]. 22 The T c depression is believed to arise from a redistribution of doping charge in the CuO 2 layer stacks from the interior to the outer CuO 2 layers [117] which has been confirmed by NMR measurements [118,119]. Based on these experimental results, a reasonable theoretical description of T c (n) has recently been modeled in a phenomenological Ginzburg-Landau free energy approach [120].…”

“…Today, NbTi and Nb 3 Sn conductors are the basis of a billion Euro SC wire industry which delivers magnets that cannot be realized by means of conventional metal wire conductors, e. g., for Magnetic Resonance Imaging (MRI) systems and High-Energy Physics (HEP) particle accelerators 7 [1,22,23]. The enormously high critical fields H c2~ 100 T of HTS [24] indicate their potential for extremely high-field applications.…”

“…Besides the scientific interest, the search for applications has always been a driving force for superconductor materials science [22]. Right from the discovery, it had been envisioned that SC coils with high persistent current might be used to generate strong magnetic fields.…”