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- W1663928314 abstract "We have studied the temperature dependence of linewidths in the quasi-two-dimensional magnetic crystals ${mathrm{C}}_{2}$${mathrm{H}}_{5}$(${mathrm{NH}}_{3}$${)}_{2}$${mathrm{MnCl}}_{4}$:${mathrm{Cu}}^{2+}$ with different concentrations of paramagnetic ${mathrm{Cu}}^{2+}$ ions with the use of electron spin resonance between 295 and 30 K. We have measured the linewidths at X-band microwave frequency at ensuremath{theta}=0ifmmode^circelsetextdegreefi{} and 55ifmmode^circelsetextdegreefi{} where ensuremath{theta} is the angle between the steady magnetic field ${mathrm{H}}_{0}$ and the normal to the plane of the crystal. The linewidths initially decreased as the temperature was lowered from room temperature towards the antiferromagnetic ordering temperature ${T}_{N}$, passed through a minimum, and then increased rapidly as ${T}_{N}$ is approached. We have interpreted our results in the light of the theory which assumes the diffusive motion of spins for the longtime dependence of the time correlation functions. We have studied also the line shapes in the four samples, including the one with no impurity present, at room temperature, and at ensuremath{theta}=0ifmmode^circelsetextdegreefi{}, 55ifmmode^circelsetextdegreefi{}, and 90ifmmode^circelsetextdegreefi{}. At all three angles of orientation ensuremath{theta}, the line shapes in all four samples were observed to be pure Lorentzian for up to 1.5--2.5 linewidths from the center of resonance line. However, the non-Lorentzian character was observed to increase with the impurity concentration at all three angles of orientation ensuremath{theta} in all four samples." @default.
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- W1663928314 date "1988-06-01" @default.
- W1663928314 modified "2023-09-27" @default.
- W1663928314 title "Temperature dependence of spin dynamics in the impurity-doped quasi-two-dimensional antiferromagnetC2H5(NH3)2MnCl42+:Cu2+" @default.
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- W1663928314 doi "https://doi.org/10.1103/physrevb.37.9564" @default.
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