Journal
MATERIALS TODAY
Volume 21, Issue 3, Pages 278-302Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mattod.2017.09.006
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) through the Element Strategy Initiative to Form Core Research Center
- Japan Society for the Promotion of Science (JSPS) [25106007]
- JSPS [17H01318, 15H05519]
- Support for Tokyotech Advanced Research (STAR)
- National Natural Science Foundation of China [51320105015]
- Beijing Municipal Science and Technology Commission [Z171100002017006]
- Bureau of Frontier Sciences and Education, Chinese Academy of Sciences [QYZDJ-SSW-JSC026]
- Grants-in-Aid for Scientific Research [15H05519, 25106007] Funding Source: KAKEN
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Iron with a large magnetic moment was widely believed to be harmful to the emergence of superconductivity because of the competition between the static ordering of electron spins and the dynamic formation of electron pairs (Cooper pairs). Thus, the discovery of a high critical temperature (Tc) iron-based superconductor (IBSC) in 2008 was accepted with surprise in the condensed matter community and rekindled extensive study globally. IBSCs have since grown to become a new class of high-T-c superconductors next to the high-Tc cuprates discovered in 1986. The rapid research progress in the science and technology of IBSCs over the past decade has resulted in the accumulation of a vast amount of knowledge on IBSC materials, mechanisms, properties, and applications with the publication of more than several tens of thousands of papers. This article reviews recent progress in the technical applications (bulk magnets, thin films, and wires) of IBSCs in addition to their fundamental material characteristics. Highlights of their applications include high-field bulk magnets workable at 15-25 K, thin films with high critical current density (J(c)) > 1 MA/cm(2) at similar to 10 T and 4 K, and an average J(c) of 1.3 x 10(4) A/cm(2) at 10 T and 4 K achieved for a 100-m-class-length wire. These achievements are based on the intrinsically advantageous properties of IBSCs such as the higher crystallographic symmetry of the superconducting phase, higher critical magnetic field, and larger critical grain boundary angle to maintain high J(c). These properties also make IBSCs promising for applications using high magnetic fields.
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