Pressure Effects on the Superconducting and SpinDensityWave States of the Newly Discovere.pdfVIP

Effect of pressure on the superconducting and spin-density-wave states of Sm(O F )FeAs 1−x x 1 1 1 2 2 2 1,3,4 B. Lorenz , K. Sasmal , R. P. Chaudhury , X. H. Chen , R. H. Liu , T. Wu , and C. W. Chu 1Department of Physics and TCSUH, University of Houston, Houston, TX 77204, USA 2Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China 3Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA and 4 Hong Kong University of Science and Technology, Hong Kong, China 8 (Dated: August 4, 2008) 0 0 High temperature superconductors with a Tc above 40 K have been found to be strongly correlated 2 electron systems and to have a layered structure. Guided by these rules, Kamihara et al. discovered g a Tc up to 26 K in the layered La(O1−xFx)FeAs. By replacing La with tri-valence rare-earth u elements RE of smaller ionic radii, Tc has subsequently been raised to 41 - 52 K. Many theoretical A models have been proposed emphasizing the important magnetic origin of superconductivity in this compound system and a possible further T -enhancement in RE(O F )FeAs by compression. This