Abstract
We have performed 11 B nuclear magnetic resonance (NMR) measurements on the single crystals of GdB 4 to investigate local electronic structure and 4f spin dynamics. 11 B NMR spectrum, Knight shift, spin–lattice and spin–spin relaxation rates, 1 / T 1 and 1 / T 2 , were measured down to 4 K at 8 T . 11 B NMR shift and linewidth are huge and strongly temperature-dependent due to the 4f moments. In addition, both are proportional to magnetic susceptibility, indicating that the hyperfine field at the boron site originates from the 4f spins of Gd. Below T N , the single broad resonance peak of 11 B NMR splits into several peaks reflecting the local magnetic fields due to antiferromagnetic spin arrangements. The spin–lattice relaxation rate, independent of temperature above T N , decreases significantly below T N confirming huge suppression of spin fluctuation.
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