%0 Journal Article
%J Physical Review B
%D 2008
%T Single-crystal growth and physical properties of the layered arsenide BaRh2As2
%A Singh, Y.
%A Lee, Y.
%A Nandi, S.
%A Kreyssig, A.
%A Ellern, A.
%A Das, S.
%A Nath, R.
%A Harmon, B. N.
%A Goldman, A. I.
%A Johnston, D. C.
%K superconductivity
%M ISI:000259690400088
%P 104512
%R 10.1103/PhysRevB.78.104512
%V 78
%X Single crystals of BaRh2As2 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 T, anisotropic magnetic susceptibility chi versus T, electrical resistivity in the ab plane rho versus T, Hall coefficient versus T and magnetic field H, and heat capacity C versus T measurements on the crystals. The single-crystal structure determination confirms that BaRh2As2 forms in the tetragonal ThCr2Si2-type structure (space group I4/mmm) with lattice parameters a=b=4.0564(6) angstrom and c=12.797(4) angstrom. Band-structure calculations show that BaRh2As2 should be metallic with a small density of states at the Fermi energy N(E-F)=3.49 states/eV f.u. (where f.u. equivalent to formula unit) for both spin directions. rho(T) data in the ab plane confirm that the material is indeed metallic with a residual resistivity rho(2 K)=29 mu Omega cm and with a residual resistivity ratio rho(310 K)/rho(2 K)=5.3. The observed chi(T) is small (similar to 10(-5) cm(3)/mol) and weakly anisotropic with chi(ab)/chi(c)approximate to 2. The C(T) data indicate a small density of states at the Fermi energy with the low-temperature Sommerfeld coefficient gamma=4.7(9) mJ/mol K-2. There are no indications of superconductivity, spin-density wave, or structural transitions between 2 and 300 K. We compare the calculated density of states versus energy of BaRh2As2 with that of BaFe2As2.
%8 Sep
%9 Article
%@ 1098-0121