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The substitution of Tb for Tm in the Laves phase compound $\mathrm{Tm}{\mathrm{Co}}_{2}$ leads to appearance of a magnetic moment on the Co atoms through the metamagnetic transition in the itinerant $d$-electron subsystem and gives rise to long-range ferrimagnetic order in ${\mathrm{Tm}}_{1\ensuremath{-}x}{\mathrm{Tb}}_{x}{\mathrm{Co}}_{2}$ at $x\ensuremath{\geqslant}0.15$. The magnetic state of the compound ${\mathrm{Tm}}_{0.9}{\mathrm{Tb}}_{0.1}{\mathrm{Co}}_{2}$, i.e., just below the critical Tb concentration, is characterized by the presence of large regions with short-range magnetic order and localized spin fluctuations (LSFs) induced in the Co $3d$-electron subsystem by the fluctuating $f\text{\ensuremath{-}}d$ exchange due to the Tm-Tb substitution. The peculiar magnetic state of this compound is strongly influenced by an external magnetic field which produces a first-order magnetic phase transition to a long-range ferrimagnetic state with the magnetic moment on the Co atoms up to $(0.7\char21{}0.8){\ensuremath{\mu}}_{B}$. This field-induced transition in ${\mathrm{Tm}}_{0.9}{\mathrm{Tb}}_{0.1}{\mathrm{Co}}_{2}$ is found to be irreversible. It is accompanied by a giant and irreversible reduction of the electrical resistivity $(\ensuremath{\Delta}\ensuremath{\rho}∕\ensuremath{\rho}\ensuremath{\sim}\ensuremath{-}45%)$, specific heat (by about 3.7 times at $2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$), and intensity of magnetic neutron scattering. Such behavior is associated with the field-induced metamagnetic transition in the itinerant $d$-electron subsystem mediated by the $f\text{\ensuremath{-}}d$ exchange. Significantly enhanced values of the residual resistivity and the coefficient $\ensuremath{\gamma}$ of the $T$-linear contribution to the specific heat in the compound with $x=0.1$ as well as their unusual behavior with temperature and under application of the magnetic field is ascribed to the presence of LSF.

physical review b

Irreversibility of the magnetic state of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Tm</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Tb</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>revealed by specific heat, electrical resistivity, and …

Irreversibility of the magnetic state ofTm1−xTbxCo2revealed by specific heat, electrical resistivity, and …