Y. Lee

K-Doping Dependence of the Fermi Surface of the Iron-Arsenic Ba1-xKxFe2As2 Superconductor Using Angle-Resolved Photoemission Spectroscopy

C. Liu, G. D. Samolyuk, Y. Lee, N. Ni, T. Kondo, A. F. Santander-Syro, 3 S. L. Bud’ko, J. L. McChesney, E. Rotenberg, T. Valla, A. V. Fedorov, P. C. Canfield, B. N. Harmon, and A. Kaminski Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA Laboratoire Photons Et Matière, UPR-5 CNRS, ESPCI, 10 rue Vauquelin, 75231 Paris cedex 5, France Labratoire de Physique des Solides, UMR-8502 CNRS, Université Paris-Sud, Bât. 510, 91405 Orsay, France Advanced Light Source, Berkeley National Laboratory, Berkeley, California 94720, USA Condensed Matter Physics and Materials Science Dept., Brookhaven National Laboratory, Upton, New York 11973, USA (Dated: June 20, 2008)

Ba(1-x)K(x)Mn2As2: an antiferromagnetic local-moment metal.

The compound BaMn2As2 with the tetragonal ThCr2Si2 structure is a local-moment antiferromagnetic insulator with a Néel temperature T(N)=625 K and a large ordered moment μ=3.9μ(B)/Mn. We demonstrate that this compound can be driven metallic by partial substitution of Ba by K while retaining the same crystal and antiferromagnetic structures together with nearly the same high T(N) and large μ. Ba(1-x)K(x)Mn2As2 is thus the first metallic ThCr2Si2-type MAs-based system containing local 3d transition metal M magnetic moments, with consequences for the ongoing debate about the local-moment versus itinerant pictures of the FeAs-based superconductors and parent compounds. The Ba(1-x)K(x)Mn2As2 class of compounds also forms a bridge between the layered iron pnictides and cuprates and may be useful to test theories of high T(c) superconductivity.

Single-crystal growth and physical properties of the layered arsenide BaRh2As2

Single crystals of

Crystallographic, Electronic, Thermal, and Magnetic Properties of Single-Crystal SrCo2As2

{text{BaRh}}_{2}{text{As}}_{2}

Anisotropy of the pairing gap of FeAs-based superconductors induced by spin fluctuations

have been synthesized from a Pb flux. We present the room-temperature crystal structure, single-crystal x-ray diffraction measurements as a function of temperature

Influence of magnetism on phonons in CaFe2As2 as seen via inelastic x-ray scattering

T

Quantum phases in a doped Mott insulator on the Shastry-Sutherland lattice.

, anisotropic magnetic susceptibility

Itinerant ferromagnetism in the As

ensuremath{chi}

4p

versus

conduction band of Ba

T