67 research outputs found
Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
Resistivity, magnetic susceptibility and heat capacity measurements are
reported for single crystals of Fe1+yTexSe1-x grown via a modified Bridgeman
method with 0 < y < 0.15, and x= 1, 0.9, 0.75, 0. 67, 0.55 and 0.5. Although
resistivity measurements show traces of superconductivity near 14 K for all x
except x=1, only crystals grown with compositions near x=0.5 exhibit bulk
superconductivity. The appearance of bulk superconductivity correlates with a
reduction in the magnitude of the magnetic susceptibility at room temperature
and smaller values of y, the concentration of Fe in the Fe(2) site.Comment: Submitted to Phys. Rev.
Magnetic field-induced quantum critical point in YbPtIn and YbPtIn single crystals
Detailed anisotropic (Hab and Hc) resistivity and
specific heat measurements were performed on online-grown YbPtIn and
solution-grown YbPtIn single crystals for temperatures down to 0.4 K,
and fields up to 140 kG; Hab Hall resistivity was also measured on
the YbPtIn system for the same temperature and field ranges. All these
measurements indicate that the small change in stoichiometry between the two
compounds drastically affects their ordering temperatures (T
K in YbPtIn, and K in YbPtIn). Furthermore, a field-induced
quantum critical point is apparent in each of these heavy fermion systems, with
the corresponding critical field values of YbPtIn (H around
35-45 kG and H kG) also reduced compared to the analogous
values for YbPtIn (H kG and H kG
Magnetic order of the La3NiGe2-type Ho3NiGe2
International audienc
Magnetic order of the La3NiGe2-type Tb3NiSi2
International audienc
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