11B-NMR studies of weakly ferromagnetic BaB6


11B-NMR studies of weakly ferromagnetic BaB6

Mushkolaj, S.; Gavilano, J. L.; Rau, D.; Ott, H. R.; Bianchi, A.; Fisk, Z.

BaB6 is a weakly ferromagnetic material with a Curie temperature TC well above room temperature. From the results of d.c. magnetization measurements on single crystalline BaB6, the saturation magnetization at low temperatures is 8\times 10-4(\mu B/f.u.), in line with other weak ferromagnets of the hexaboride series. The 11B-NMR spectra measured on a collection of single crystals of BaB6 yield a quadrupolar frequency of 472 KHz, in good agreement with calculated field gradients for this type of materials. The central 11B-NMR transition consists of two partially resolved signals, where the frequency displacement between them is of the order of 10 KHz. One of the signals exhibits a positive, the other a negative frequency shift, both of the order of 50 ppm. Between 7 K and room temperature these shifts do not vary with temperature. The temperature dependence of the spin-lattice relaxation rate T1 -1(T) at the B sites is similar to that of other alkaline-earth hexaborides.

  • Open Access Logo Acta Physica Polonica B 34(2003)22, 1537-1537

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Publ.-Id: 7249