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Schlagwörter:
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Zusammenfassung:
Here we present the results of high-resolution x-ray diffraction
experiments along with specific heat, resistivity, and magnetization
measurements of chemically well-characterized Fe1.12-xMx Te (M = Co, Ni)
samples. The motivation is to investigate how the two coupled
magnetostructural phase transitions in the antiferromagnetic parent
compound Fe1.12Te of chalcogenide superconductors can be tuned. While
the two-step magnetostructural transition (tetragonal-to-orthorhombic
followed by orthorhombic-to-monoclinic) persists in Fe1.10Co0.02Te, only
one, tetragonal-to-orthorhombic transition was observed in
Fe1.10Ni0.02Te. Upon increasing the Co and Ni substitution, the
structural phase transitions and the long-range magnetic order are
systematically suppressed without any sign of superconductivity. For
high substitution levels (x >= 0.05), a spin-glass-like behavior was
observed and the low-temperature structure remains tetragonal. From our
results, it can be inferred that the electron doping strongly suppresses
the magnetostructural phase transitions.
