Nuclear Spin-Lattice Relaxation Study in Spin Glass Co<I><SUB>x</SUB></I>Ga<SUB>1−<I>x</I></SUB> Intermetallic Compounds
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The spin echo decay of <SUP>59</SUP>Co associated with nonmagnetic Co atom in CoGa compounds was measured at 9, 5 and 2.5 MHz in wide temperature range through the spin glass transition temperature, <I>T</I><SUB>g</SUB>. At <I>T</I>>><I>T</I><SUB>g</SUB>, nuclear spin-lattice relaxation time, <I>T</I><SUB>1</SUB>, was also measured. Analyzing the spin echo decay and <I>T</I><SUB>1</SUB>, we have deduced the average nuclear spin-lattice relaxation rate, 〈<I>T</I><SUB>1L</SUB><SUP>−1</SUP>〉, to the system of localized moments, which shows a progressive peak like the case of the <I>critical slowing down</I> near <I>T</I><SUB>g</SUB>. The temperature at the peak is somewhat lower than <I>T</I><SUB>g</SUB> measured by magnetic susceptibility in zero field. 〈<I>T</I><SUB>1L</SUB><SUP>−1</SUP>〉 increases rapidly with decreasing the resonance field near the temperature at the peak. Following Chen and Slichter, the electron spin correlation time, τ<SUB>m</SUB> was estimated from 〈<I>T</I><SUB>1L</SUB><SUP>−1</SUP>〉 and the integrated intensity. τ<SUB>m</SUB> shows a slowing down of orders three at the transition.
- 社団法人 日本物理学会の論文
社団法人 日本物理学会 | 論文
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