About the cover

March 2014 Volume 10 No 3

Superconductivity in iron pnictides seems to be related to the formation of electronic nematic phases that break the rotational symmetry of the crystal lattice. But the nematic phase in NaFeAs is now shown to persist at high temperatures owing to the presence of antiferroic fluctuations. Article p225; News & Views p184

IMAGE: E.P. ROSENTHAL AND CHRISTOPHER GUTIÉRREZ

COVER DESIGN: ALLEN BEATTIE