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Full-Text Articles in Physics

Crystal Structure, Homogeneity Range And Electronic Structure Of Rhombohedral Γ-Mn5al8, Srinivasa Thimmaiah, Zachary Tener, Tej N. Lamichhane, Paul C. Canfield, Gordon J. Miller Jul 2017

Crystal Structure, Homogeneity Range And Electronic Structure Of Rhombohedral Γ-Mn5al8, Srinivasa Thimmaiah, Zachary Tener, Tej N. Lamichhane, Paul C. Canfield, Gordon J. Miller

Chemistry Publications

The γ-region of the Mn–Al phase diagram between 45 and 70 at.% Al was re-investigated by a combination of powder and single crystal X-ray diffraction as well as EDS analysis to establish the distribution of Mn and Al atoms. Single crystals of γ-Mn5–x Al8+x were grown using Sn-flux at 650 °C. The crystal structure, atomic coordinates and site occupancy parameters of γ-Mn5−x Al8+x phases were refined from single crystal X-ray data. The γ-Mn5-x Al8+x phase adopts the rhombohedral Cr5Al8-type structure rather than a cubic γ-brass structure. The refined compositions from two crystals extracted ...


Superconducting Properties Of Rh 9 In 4 S 4 Single Crystals, Udhara S. Kaluarachchi, Qisheng Lin, Weiwei Xie, Valentin Taufour, S. L. Bud’Ko, Gordon J. Miller, Paul C. Canfield Jan 2016

Superconducting Properties Of Rh 9 In 4 S 4 Single Crystals, Udhara S. Kaluarachchi, Qisheng Lin, Weiwei Xie, Valentin Taufour, S. L. Bud’Ko, Gordon J. Miller, Paul C. Canfield

Chemistry Publications

The synthesis and crystallographic, thermodynamic, and transport properties of single crystalline Rh9In4S4 were studied. The resistivity, magnetization, and specific heat measurements all clearly indicate bulk superconductivity with a critical temperature, Tc∼2.25 K. The Sommerfeld coefficient γ and the Debye temperature (ΘD) were found to be 34 mJ mol−1 K−2 and 217 K, respectively. The observed specific heat jump, ΔC/γTc=1.66, is larger than the expected BCS weak coupling value of 1.43. Ginzburg-Landau (GL) ratio of the low-temperature GL-penetration depth, λGL≈5750 Å, to the GL-coherence length, ξGL≈94 Å, is large: κ ∼60 ...


Oxygen Trapped By Rare Earth Tetrahedral Clusters In Nd4feos6: Crystal Structure, Electronic Structure, And Magnetic Properties, Qisheng Lin, Valentin Taufour, Yuemei Zhang, Max Wood, Thomas Drtina, Sergey L. Bud’Ko, Paul C. Canfield, Gordon J. Miller Sep 2015

Oxygen Trapped By Rare Earth Tetrahedral Clusters In Nd4feos6: Crystal Structure, Electronic Structure, And Magnetic Properties, Qisheng Lin, Valentin Taufour, Yuemei Zhang, Max Wood, Thomas Drtina, Sergey L. Bud’Ko, Paul C. Canfield, Gordon J. Miller

Chemistry Publications

Single crystals of Nd4FeOS6 were grown from an Fe–S eutectic solution. Single crystal X-ray diffraction analysis revealed a Nd4MnOSe6-type structure (P63mc, a=9.2693(1) Å, c=6.6650(1)Å, V=495.94(1) Å3, Z=2), featuring parallel chains of face-sharing [FeS6×1/2]4− trigonal antiprisms and interlinked [Nd4OS3]4+ cubane-like clusters. Oxygen atoms were found to be trapped by Nd4 clusters in the [Nd4OS3]4+ chains. Structural differences among Nd4MnOSe6-type Nd4FeOS6and the related La3CuSiS7− and Pr8CoGa3-type structures have been described. Magnetic susceptibility measurements on Nd4FeOS6 suggested the dominance of antiferromagnetic interactions at low ...