Study of anisotropy in momentum density of cobalt

B. K. Sharma,^a B. L. Ahuja,^b S. S. Asawat,^a V. Purvia,^a Y. Kakutani,^c A. Koizumi^c and

N. Sakai^c

^aDepartment of Physics, University of Rajasthan, Jaipur 302015, India; ^bDepartment of Physics, College of Science Campus, M. L. Sukhadia University, Udaipur 313001, India; ^cGraduate School and Faculty of Science, Himeji Institute of Technology, Ako-gun, Hyogo 678-1297, Japan (bkrish@sancharnet.in)

The directional Compton profiles of hcp cobalt have been measured at 0.42 a.u. momentum resolution using synchrotron radiation at SPring8, Japan. The measurement is compared with the available APW calculation of Matsumoto et al [1]. It is seen that the APW calculation describes qualitatively the anisotropy of the electron momentum distribution, which is influenced by the Fermi surface topology. The lack of quantitative agreement between theoretical and experimental anisotropies may be due to insufficient treatment of the momentum component above 6.5 a.u. and electron-electron correlation effect. The data points to the need for a better theoretical calculation incorporating the above mentioned features.

References

1 Mastumoto, M., Tomimoto, K. and Wakoh, S. (1993) J. Phys. Soc. Jpn 62, 2734