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17 papers
Structural phase transition below 250 K in superconducting KFeSe
A. Ignatov, A. Kumar, P. Lubik +5
Vibrational properties of iron-chalcogenide superconductor KFeSe with 30 K have been measured by Raman and optical spectroscopies over temperatu…
Formation of partial energy gap below the structural phase transition and the rare-earth element substitution effect on infrared phonons in ReFeAsO (Re=La, Nd, and Sm)
T. Dong, Z. G. Chen, R. H. Yuan +3
Single crystals of LaFeAsO, NdFeAsO, and SmFeAsO have been prepared by means of a NaAs flux growth technique and studied by optical spectroscopy measurements. We show that the spec…
Structural and magnetic phase transitions in NaFeAs
Shiliang Li, Clarina de la Cruz, Q. Huang +5
We use neutron scattering to study the spin and lattice structures of single crystal and powder samples of NaFeAs ( K). On cooling from room temperature, the syst…
Electronic Structure of the BaFeAs Family of Iron Pnictides
M. Yi, D. H. Lu, J. G. Analytis +11
We use high resolution angle-resolved photoemission spectroscopy to study the band structure and Fermi surface topology of the BaFeAs iron pnictides. We observe two electro…
Multiple phase transitions in single-crystalline NaFeAs
G. F. Chen, W. Z. Hu, J. L. Luo +1
Specific heat, resistivity, susceptibility and Hall coefficient measurements were performed on high-quality single crystalline NaFeAs. This compound is found to undergo thr…
Two superconducting gaps in LaFeAsO0.92F0.08 revealed by 75As nuclear quadrupole resonance
S. Kawasaki, K. Shimada, G. F. Chen +3
We report As nuclear quadrupole resonance (NQR) studies on superconducting oxypnictide LaFeAsOF ( = 23 K). The temperature dependence of the spi…