鎶ュ憡棰樼洰錛欳hemical Pressure and Quantum Criticality in Iron/Nickel Pnictides
銆€銆€鎶ュ憡浜猴細璁哥瀹?br>銆€銆€鎶ュ憡鏃墮棿錛?018騫?鏈?8鏃ワ紙鍛ㄥ洓錛?涓婂崍 10:00
銆€銆€鎶ュ憡鍦扮偣錛氭牸鑷翠腑妤?00瀹?br>銆€銆€鎶ュ憡鍐呭錛歈uantum criticality describes a continuously second-order phase transition at zero temperature, which has been broadly discussed together with non-Fermi liquid (NFL) and unconventional superconductivity in a number of strongly correlated electron systems. The iron-based pnictides have not only revived the study of high-temperature superconductivity, but also provided a new material class for investigating quantum criticality and heavy fermion behaviour. A canonical system for the latter is the 1111-type rare-earth iron pnictide CeFeAsO. The heavy-fermion behaviour depends crucially on the delicate interplay between the 3d and 4f electrons; but the presence of the 3d-electron antiferromagnetic (AFM) order in the FeAs layer complicates the study of the 4f electrons. The chemical pressure induced by P-for-As substitution is a powerful knob to tune the interplay or competition of superconductivity, Kondo effect and magnetic orders. After an introduction to the structure and chemical pressure effect in iron-based superconductors, I present two novel quantum criticality cases in Ce-contained pnictides: Heavy-fermion quantum criticality and destruction of the Kondo effect in CeNiAsO, and Heavy fermion quantum criticality at dilute carrier limit in CeNi2路鈻?As1路xPx)2.
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