Nuclear magnetic resonance of CeCo4B

59Co NMR study in Y(Co,Ti)12

“…H d was calculated as a classical dipole sum, which is negligibly small. In order to estimate the Co magnetic moment, we will assume as follows: (i) the hyperfine coupling constants a and b do not depend on crystallographic sites and we employed the hyperfine coupling constants a ¼ À160 and b ¼ þ490 kOe=m B [6], (ii) the hyperfine field is negative and (iii) the absolute value of the hyperfine field depends on the magnitude of magnetization at each site. Then the orbital magnetic moments of Co atoms in YCo 11 Ti are estimated as 0.09, 0.15 and 0.09 m B for the 8i, 8j and 8f sites, respectively.…”

“…According to the time-of-flight neutron diffraction at 293 K (T C ¼ 1050 K [5]), the refined Co moments at 8i, 8j and 8f sites are 1.66, 1.42 and 1.47 m B , respectively [3]. Though it is difficult to assign the resonance lines because intensity ratios are not accurate with influences such as relaxation time, we have tried to estimate the Co magnetic moment (spin and orbital moment separately) for each site in YCo 11 Ti on the basis of an empirical relation between the 59 Co hyperfine fields and Co moments given by [6],…”

Magnetic characteristics and band structure calculations of Y2Co7–xNixB3 compounds

“…The cobalt atoms which have N layers containing boron atoms just above or/and below in the R n+1 Co 3n+5 B 2n structure are denoted by Co(N) (N = 0, 1, and 2). It was found theoretically [3,13] and experimentally [15] that the magnetic contribution decreases from Co(0) to Co (2). In the Y 2 Co 7 B 3 structure, Co(N) corresponds to Co 2(c), Co 6(i 1 ), and Co 6(i 2 ) for N = 0, 1, and 2, respectively.…”