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Abstract
Measurements of the spin–lattice relaxation rate, ( T 1) −1, of 11B in R ENi 2B 2C with R E=Y, Lu and Th and in Y(Ni 0.8Co 0.2) 2B 2C have been carried out in a wide temperature ( T) range. In the normal state, the values of ( T 1 T) −1 in R E=Y and Lu increase with decreasing T presumably due to the antiferromagnetic ( AF) spin fluctuations. ( T 1 T) −1 in R E=Th obeys the Korringa relation below 150 K, while ( T 1 T) −1 is weakly T dependent above 150 K. ( T 1) −1 of 11B- and 13C-NMR in the superconducting state decrease rapidly with decreasing T with no appreciable enhancement just below T c, successively vary in proportion to temperature at further low T. Similar behaviors of ( T 1) −1 have already been observed in Cu-NQR and NMR of Zn-doped high T c cuprates where d-wave superconductivity is realized.
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