کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1799997 1524871 2014 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnetic transition in 122 pnictides XFe2As2 (X=Ca, Sr) probed by hyperfine interaction of 66Ga
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Magnetic transition in 122 pnictides XFe2As2 (X=Ca, Sr) probed by hyperfine interaction of 66Ga
چکیده انگلیسی


• We provide detailed measurement of 66Ga hyperfine field in XFe2As2 (X = Ca, Sr) employing TDPAD technique.
• Hyperfine field data shows second order type magnetic transition.
• The critical exponent near phase transition suggests moments are out of ab plane.
• Fe possesses small local moment showing itinerant behaviour.

Employing the time differential perturbed angular distribution (TDPAD) method we have studied the temperature dependence of the magnetic hyperfine field, Bhf for 66Ga in 122 type pnictides, XFe2As2 (X = Ca and Sr). The saturation hyperfine field, Bhf (0) of Ga in Ca(Sr)Fe2As2 have been observed to be 16.2 kG and 22 kG respectively. Scaled by the hyperfine field of 66Ga in ferromagnetic elements Fe, Co and Ni, our Bhf (0) data indicate small local moments on Fe, consistent with itinerant type magnetism of these materials. The observed temperature dependence of the hyperfine field data suggests second order type magnetic phase transition with a critical exponent β≈0.22(3)β≈0.22(3) indicating quasi-two dimensional magnetic ordering, possibly due to canting of Fe moments out of the ab plane.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 349, January 2014, Pages 240–243
نویسندگان
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