Microscopic quantum interference in excitonic condensation of Ta2NiSe5

Koudai Sugimoto, Tatsuya Kaneko, Yukinori Ohta

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

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 Tc, whereas in NMR spin-lattice relaxation the rate rapidly decreases below Tc; 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 Tc as well as in a softening of the elastic shear constant, in accordance with the second-order phase transition observed in Ta2NiSe5.

Original languageEnglish
Article number041105
JournalPhysical Review B
Volume93
Issue number4
DOIs
Publication statusPublished - 2016 Jan 15
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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