Mössbauer study on CsFeCl3and RbFeCl3

Abstract

The Mössbauer spectra of CsFe${\mathrm{Cl}}_3$ and RbFe${\mathrm{Cl}}_3$ single crystals have been studied in the temperature range 4.2-300 °K. The temperature dependence of the quadrupole splitting (QS), center shift (CS), and $f$ factor were obtained. It is shown that the single-ion parameters for the ${}_{}{}^5{}_{}{}^{}T_{2g}^{}{}_{}{}^{}$ level of ${\mathrm{Fe}}^{2+}$ are similar in both crystals: $\lambda =78\mathrm{}\pm 5$ ${\mathrm{cm}}^{-1\mathrm{}}$, $\frac{\Delta }{\lambda }=-0.88\mathrm{} \mathrm{and}-0.78\mathrm{}$ for CsFe${\mathrm{Cl}}_3$ and RbFe${\mathrm{Cl}}_3$, respectively. Mössbauer measurements of CsFe${\mathrm{Cl}}_3$ down to 1.4 °K show no transition to three-dimensional ordered state. (RbFe${\mathrm{Cl}}_3$ orders at 2.45 °K.) When the magnetic interaction between the lowest $s=1\mathrm{}$ crystal field state of ${\mathrm{Fe}}^{2+}$ is taken into consideration, the following parameters fit best the QS spectra: $D=13\mathrm{}\pm 1 \mathrm{and} 12\pm 1$ ${\mathrm{cm}}^{-1\mathrm{}}$, $J_{\parallel }=2.5\mathrm{}\pm 0.5 \mathrm{and} 5\pm 1$ ${\mathrm{cm}}^{-1\mathrm{}}$, ${\mathrm{J}}_{\perp }=5\mathrm{}\pm 1 \mathrm{and} 11\pm 2$ ${\mathrm{cm}}^{-1\mathrm{}}$ for CsFe${\mathrm{Cl}}_3$ and RbFe${\mathrm{Cl}}_3$, respectively. From the temperature dependence of the CS and $f$ factor, effective Einstein and Debye temperatures are deduced: ${\Theta }_E=(204\mathrm{}\pm 22)$ °K, ${\Theta }_D=(185\mathrm{}\pm 25)$ °K for CsFe${\mathrm{Cl}}_3$; and ${\Theta }_E=(310\mathrm{}\pm 45)$ °K,

Keywords

• MATHVARIANT
• INLINE
• XMLNS
• WWW.W3.ORG/1998/MATH/MATHML
• HTTP
• MSUB
• MROW
• TEMPERATURE DEPENDENCE

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