Nuclear quadrupole spin-lattice relaxation in Bi4Ge3O12 single crystals doped with atoms of d or f elements. Crystal field effects in compounds exhibiting anomalous magnetic properties |
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| Authors: | V G Orlov G S Sergeev Tetsuo Asaji E A Kravchenko and Yu F Kargin |
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| Institution: | (1) CNRS, UMR HydroSciences, Universit? de Montpellier 2, Place E. Bataillon, CC. MSE, 34095 Montpellier cedex 5, France;(2) IRD, UMR HydroSciences, 276 Av. de Maradi, BP 11416, Niamey, Niger;(3) IRD, UMR HydroSciences, Universit? de Montpellier 2, Place E. Bataillon, CC. MSE, 34095 Montpellier cedex 5, France;(4) D?partement de G?ologie, Universit? Abdou Moumouni, BP 10662, Niamey, Niger;(5) IRD, UMR LTHE, Indo-French Cell for Water Science, Indian Institute of Science, 560012 Bangalore, India;(6) IRD, UMR LTHE, BP 53, 38041 Grenoble cedex 9, France; |
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| Abstract: | The nuclear quadrupole spin-lattice relaxation was studied in the range 4.2–300 K for single crystals of Bi4Ge3O12 doped with minor amounts (the tenth fractions of mol%) of paramagnetic atoms of Cr, Nd, and Gd. Unusual spin dynamic features
were recently found for these crystals at room temperature: a dramatic (up to 8-fold) increase in the effective nuclear quadrupole
spin-spin relaxation time T
2* occurred upon doping the pure Bi4Ge3O12 sample. Unlike T
2*, the effective spin-lattice relaxation time T
1* at room temperature differs insignificantly for both doped and pure samples. But at lower temperatures, the samples exhibit
considerably different behavior of the spin-lattice relaxation with temperature, which is caused by different contributions
to the relaxation process of the dopant paramagnetic atoms. The distinctive maximum in the temperature dependence of the spin-lattice
relaxation time for the Nd-doped crystal is shown to result from the crystal electric field effects. |
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