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- W1957702287 abstract "The effect of ${mathrm{Zn}}^{2+}$ ion impurities on the phase transition temperature of single crystals of calcium cadmium acetate hexahydrate (CCDAH) has been studied using the electron-paramagnetic-resonance technique. The lowering of the phase transition temperature as a function of increasing ${mathrm{Zn}}^{2+}$ impurity ion concentration in the crystals has been observed to be quite different from that found in our earlier studies of ${mathrm{Cu}}^{2+}$ and ${mathrm{Mn}}^{2+}$ ion doped crystals. Though the observed lowering of phase transition temperature with atomic fraction x of the ${mathrm{Zn}}^{2+}$ impurity ion can be explained fairly well in terms of mean-field theory and a soft mode arising out of the harmonic vibration of the ${mathrm{C}mathrm{a}ensuremath{-}mathrm{C}mathrm{d}}_{(1ensuremath{-}x)}{mathrm{Zn}}_{x}ensuremath{-}mathrm{Ca}$ chain along the c axis of the crystal, contrary to expectation, values of constants (such as the ratio of the square of the soft-mode frequency before transition, the mean-field constant, and the phase transition temperature, etc. of the pure crystal) are quite different from that obtained by fitting the phase transition temperatures in the ${mathrm{Cu}}^{2+}$ ion only impurity doped crystals. The temperature variation of the spin-Hamiltonian parameters of the ${mathrm{Cu}}^{2+}$ ion probe in the ${mathrm{Zn}}^{2+}$-doped crystal of CCDAH is somewhat different from that in the ${mathrm{Cu}}^{2+}$ ion only doped crystal. Deviation from mean-field theory is then considered in the ${mathrm{Zn}}^{2+}$ impurity driven modification of phase transition of the crystal and good agreement between the observed and computed values of phase transition temperature as a function of the ${mathrm{Zn}}^{2+}$ atomic fraction has been obtained using the same values of the said constants as obtained for ${mathrm{Cu}}^{2+}$ ion only impurity doped crystals." @default.
- W1957702287 created "2016-06-24" @default.
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- W1957702287 date "2002-04-26" @default.
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- W1957702287 title "EPR studies of the effect of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Zn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>ion impurities in phase transition of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi mathvariant=normal>CaCd</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=…" @default.
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- W1957702287 doi "https://doi.org/10.1103/physrevb.65.174414" @default.
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