Jeffrey Whalen

Flux Growth and Magnetoresistance Behavior of Rare Earth Zintl Phase EuMgSn

Reactions of europium and tin in 1:1 Mg/Al mixed flux produce large crystals of EuMgSn. This phase crystallizes with the TiNiSi structure type in orthorhombic space group Pnma (a = 8.0849(7) Å, b = 4.8517(4) Å, c = 8.7504(8) Å, Z = 4, R1 = 0.0137). The crystal structure features europium cations positioned between puckered hexagonal layers comprised of magnesium and tin atoms. Magnetic susceptibility measurements indicate the europium in this phase is divalent, which suggests that the compound is possibly valence-balanced as Eu(2+)Mg(2+)Sn(4-). However, EuMgSn is a metal as indicated by density of states calculations and electrical resistivity behavior. This phase exhibits antiferromagnetic ordering at T(N) = 10.9 K at low field (100 G) and the ordering temperature decreases when a higher magnetic field is applied. ac magnetization and field dependence of resistivity at 4.2 K reveal that there is a spin reorientation at 2 T, in agreement with the metamagnetic transition shown in the dc magnetization versus field data. Temperature dependence of resistivity at 2.5 T indicates that EuMgSn has a large magnetoresistance up to -30% near its magnetic ordering temperature.

Disorder-dependent superconducting phase diagram at high magnetic fields in Fe 1 + y Se x Te 1 − x ( x ∼ 0.4 )

We compare the superconducting phase-diagram under high magnetic fields (up to

Growth of EuO Single Crystals at Reduced Temperatures

H = 45

Synthesis and Crystal Structure of the Layered Lanthanide Oxychlorides Ba3Ln2O5Cl2

T) of Fe

Metal to Semimetal Transition in CaMgSi Crystals Grown from Mg−Al Flux

_{1+y}

Chemical pressure effects on structural, magnetic, and transport properties of Mn1−xCoxV2O4

Se

Single crystal synthesis and magnetism of the BaLn2O4 family (Ln = lanthanide)

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Evidence for an internal-field-induced spin-flop configuration in the extended kagome YBaCo4O7

Te

Competing Phases, Complex Structure, and Complementary Diffraction Studies of R3-δFeAl4-xMgxTt2 Intermetallics (R = Y, Dy, Er, Yb; Tt = Si or Ge; x < 0.5)

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Ba2TeO: A new layered oxytelluride

single crystals originally grown by the Bridgman-Stockbarger (BRST) technique, which were annealed to display narrow superconducting transitions and the optimal transition temperature