Microscopic quantum interference in excitonic condensation of Ta2NiSe5

Article

关键词: NUCLEAR-SPIN RELAXATION;    INSTABILITY;    ANOMALIES;   

DOI  :  10.1103/PhysRevB.93.041105

来源: SCIE

【 摘 要 】

The microscopic quantum interference associated with excitonic condensation in Ta2NiSe5 is studied in a BCS-type mean-field approximation. We show that in ultrasonic attenuation the coherence peak appears just below the transition temperature T-c, whereas in NMR spin-lattice relaxation the rate rapidly decreases below T-c; these observations can offer a crucial experimental test for the validity of the excitonic condensation scenario in Ta2NiSe5. We also show that excitonic condensation manifests itself in a jump of the heat capacity at T-c as well as in a softening of the elastic shear constant, in accordance with the second-order phase transition observed in Ta2NiSe5.

【 授权许可】

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