Authored by: Judy Z. Wu

Handbook of Superconductivity

Print publication date:  July  2022
Online publication date:  July  2022

Print ISBN: 9781439817322
eBook ISBN: 9780429179181
Adobe ISBN:


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Hg-based high-temperature superconductors (HgBCCO) encompass a series of materials described by HgBa2Can-1CunO2n+2+δ, where n = 1, 2, 3,…, and many of the chemical elements in the formula could be partially cross-substituted with others. The first report of superconductivity was in HgBa2CuO4+δ (Hg-1201) with a superconducting transition temperature (T c) of 94 K [1]. Subsequent reports on HgBa2CaCu2O6+δ (Hg-l212) [2] and HgBa2Ca2Cu3O8+δ (Hg-1223) [3] revealed higher T c values of 125 K and 135 K, respectively. These discoveries placed the HgBCCO at a unique position among the high-temperature superconductors (HTS), since most members of the HgBCCO family have T c's above 100 K. In particular, the T c of 138 K discovered in (Hg0.8,Tl0.2)-1223 remains as the highest value so far achieved in superconductors without applying pressure [4], making HgBCCO one of the most interesting systems in the investigation of the fundamental physics underlying the unresolved mechanism of high-temperature superconductivity. For practical applications, a higher T c implies higher device operating temperatures and lower cost. A particular niche for HgBCCO-related applications is at temperatures exceeding 77 K as illustrated in various prototype devices including superconducting quantum interference devices, photodetectors, microwave passive devices, wires and tapes, fault current limiters, etc.

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