Unusual crystal-lattice behaviour of CeSb at ambient pressure

作者：Hannan Abdul^*; Islam Md Shariful; Parvin Sultana Rokeya; Hossen Md Jakir

来源：Journal of the National Science Foundation of Sri Lanka, 2010, 38(3): 201-205.

• Cerium monopnictides
• CeSb
• low carrier-density
• p-f mixing
• X-ray diffraction

The temperature dependence of lattice constant of CeSb in the temperature range from 17 K to 280 K as measured by the X-ray diffraction technique exhibits an unusual minimum around 45 K. The origin of this exotic lattice behaviour has been disclosed in this article. Our model analysis shows that two types of Ce ions with different sizes, called Gamma(7) and Gamma(8)Ce ions, appear in the CeSb lattice in its paramagnetic phase to exhibit its unusual temperature dependence of lattice constant. The calculated lattice constant difference a(7)(0)- a(8)(0) at 0 K between a CeSb lattice with pure Gamma(7) Ce ions and a CeSb lattice with pure Gamma(8) Ce ions is 0.0081 A, which is very small. The lattice contraction 6, defined by (delta = {a(7)(0)-a(8)(0)}/a(7)(0) in the present analysis, is 1.263x10(-3).

• 出版日期2010-9