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Diagnosis of quantum criticality by nuclear spin-echo decay method

Kambe, Shinsaku  ; Sakai, Hironori   ; Tokunaga, Yo  ; Chudo, Hiroyuki ; Walstedt, R. E.*

In order to diagnose the quantum critical behaviour in heavy fermion systems, the Gaussian spin-spin relaxation time $$T_{2G}$$ determined by NMR spin-echo decay measurements is found to be useful. Combined with the spin-lattice relaxation time $$T_1$$, an exponent $$phi$$ of quantity $$T_1T/T_{2G}^2 sim T^{phi}$$ is predicted to be sensitive to the type of quantum criticality. In fact in heavy fermion USn$$_3$$ near the quantum critical point, $$T_1T/T_{2G}^2$$ is found to be constant as expected for the $$3D$$-SDW magnetic instability.

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Category:Physics, Condensed Matter

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