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Mossbauer studies of helimagnetic FeAs
S. K. Kulshreshtha and P. Raj (1979)
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We would like to point out that for FeAs, the temperature dependence of qtotal
has been found to be very close to linear rather than of T 3 ’ 2 type, suggesting that
the semi-empirical expression (1) does not hold good. It is doubtful whether such
a semi-empirical approach can be extended t o intermetallic compounds exhibiting
metallic behaviour, because in many other systems the quadrupole interaction is
reported to be independent of temperature, over a wide range of temperature [see
for example Haggstrom er a / (1974, 1975) Raj and Kulshreshtha (1976)l
