11B NMR of superconducting YB6

Characterization of the electronic properties of YB4 and YB6 using 11B NMR and first-principles calculations

“…The former Q value has been taken from the almanac of the spectrometer manufacturer Bruker and is very close to Q = 0.04059 [33] recommended by Pyykkö [34] in his compilation of nuclear quadrupole moments. The results are shown in Tables 3 and 4 for YB 6 and YB 4 , respectively. Experimentally, only the absolute value of V zz and η can be determined for the powder specimens.…”

“…In agreement with this crystallographic structure there is only a single EFG value. A previous 11 B NMR study for YB 6 [6] reported the spin-lattice relaxation time and the spectrum. However, the authors were unable to determine the EFG because of the widely broadened satellite lines and the weak NMR signal used in their instrumentation.…”

“…In the present paper, we report the EFG values for YB 6 and YB 4 and the determination of the Knight shifts by using the magic-angle spinning (MAS) technique. The experimental EFGs are compared and interpreted with the theoretical ones obtained from ab-initio calculations.…”

“…For instance, YB 6 , like some other rare-earth and actinide hexaborides, shows superconductivity below 7.1 K [1] and has been considered as a possible candidate for high-temperature thermoelectric materials [2].…”

Low electron density of states at the boron site of TMB2 (TM = Ti, Zr, Hf, and Nb): a 11B NMR study

“…of parameter a) are very likely due to paramagnetic impurities. Similarly, a non-zero value of the a was reported in 11 B NMR studies of the YB 6 [12] and the YNi 2 B 2 C [13]. The Table 1.…”