id	keyword
american_scientific_journal-590	iron
american_scientific_journal-590	superconductors
american_scientific_journal-590	superconductivity
american_scientific_journal-590	type
american_scientific_journal-590	phys
american_scientific_journal-590	colleagues
american_scientific_journal-590	figure
american_scientific_journal-590	temperature
american_scientific_journal-590	research
american_scientific_journal-590	journal
american_scientific_journal-590	structure