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Diagnosis of quantum criticality by nuclear spin-echo decay method

スピンエコー減衰法による量子臨界の診断

神戸 振作; 酒井 宏典; 徳永 陽; 中堂 博之; Walstedt, R. E.*

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

重い電子系の量子臨界挙動の診断にはNMRスピンエコー減衰法を用いて決めるスピン-スピン緩和時間が有効である。スピン-格子緩和時間と合わせて、$$T_1T/T_{2G}^2 sim T^{phi}$$の臨界指数$$phi$$が量子臨界の起原により異なることを見いだした。重い電子系USn$$_3$$$$T_1T/T_{2G}^2$$は低温で一定となり、SDW磁気不安定性による量子臨界が起きていることを見いだした。

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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パーセンタイル:84.88

分野:Physics, Condensed Matter

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