Influence of the crystal field on the magnetic behaviour of Er2Ni17

Site-selective magnetic order of neptunium inNp2Ni17

“…On the other hand, the large difference in magnitude between the two moments reflects their different anisotropy. As shown in Table II, [18]. Taking into account the different radial extension of the 5f and 4f wave functions [19,20] and the different Stevens coefficients [21], we obtain for site 2b B …”

Tm169Mössbauer-spectroscopy study of the magnetic superconductor TmNiMulders1, Gubbens2, Buschow3 1996Phys. Rev. B11060View full textAdd to dashboardCite

“…Using this relationship V zz latt ϭ Ϫ4cB 2 0 /␣ J ͗r 2 ͘ with cϭ185, 12 ␣ J the second-order Stevens parameter and ͗r 2 ͘ the radial integral of the 4 f electron cloud, we calculated B 2 0 ϭϪ2.8͑5͒ K. The sign of B 2 0 corresponds to a c-axis anisotropy as also observed by susceptibility and ϩ SR measurements. 1,4-6 Its strength, however, is twice as large as the value derived from the susceptibility measurements.…”

Rare Earth Mössbauer Spectroscopy Measurements on Lanthanide Intermetallics

“…Moreover, at T ¼ 4.2 K, the 166 Er spectrum of Er 2 Ni 17 shows two subspectra measured by Gubbens et al (1995b) as shown in Fig. 4.37.…”

“…Therefore, an explanation as given for Dy 2 Ni 17 does not hold. Presumably, influences of higher order crystal field terms have to be considered in order to explain the difference in hyperfine field at the Er sites in Er 2 Ni 17 (Gubbens et al, 1995b). The determined values of the spectrum at T ¼ 0.6 K are H eff ¼ 783(3) T and QS ¼ 0.32(10) cm/s for Er site I, and H eff ¼ 665(3) T and QS ¼ 0.50(10) cm/s for Er site II.…”

“…The ratios of A 6 6 /A 6 0 were fixed based on theoretical calculations and B ex was taken for the different rare earths from the data of Marquina et al (1992). Then restricted combinations of A 4 0 and A 6 0 , which yield the hyperfine fields determined ground state moments for Dy 2 Ni 17 (Bogé et al, 1979), Er 2 Ni 17 (Gubbens et al, 1995b), Tm 2 Ni 17 (Gubbens et al, 1986b) and Yb 2 Ni 17 , were simultaneously calculated. For site I values of A 4 0 ¼ À49(10) K a 0 À4 and A 6 0 ¼ 3(1) K a 0 À6 and for site II values of A 4 0 ¼ þ 10(10) K a 4 0 and A 6 0 ¼ 2(1) K a 0 À6 were found.…”