2015/12/21 by Yuya Hayashi, Y. Hayashi, S. Takai +13
Materials Science · Physics and Astronomy · #Anomaly (physics) #Antiferromagnetism #Condensed matter physics #Electrical resistivity and conductivity #Iron-based superconductors research #Kondo effect #Magnetic field #Magnetoresistance #Materials science #Organic and Molecular Conductors Research #Physics #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.7566/jpsj.85.034704
published as J. Phys. Soc. Jpn. 85, 034704 (2016) · 9 pages, 5 figures, accepted for publication in J. Phys. Soc. Jpn
arxiv created 2015/12/21 · openalex publication_date 2016/02/05 · openalex created_date 2016/06/24 · arxiv updated 2016/12/09 · openalex updated_date 2026/08/05
We have measured the electrical resistivity of cerium monochalcogenices, CeS, CeSe, and CeTe, under high pressures up to 8 GPa. Pressure dependences of the antiferromagnetic ordering temperature TN, crystal field splitting, and the ln T anomaly of the Kondo effect have been studied to cover the whole region from the magnetic ordering regime at low pressure to the Fermi liquid regime at high pressure. TN initially increases with increasing pressure, and starts to decrease at high pressure as expected from the Doniach's diagram. Simultaneously, the ln T behavior in the resistivity is enhanced, indicating the enhancement of the Kondo effect by pressure. It is also characteristic in CeXc that the crystal field splitting rapidly decreases at a common rate of -12.2 K/GPa. This leads to the increase in the degeneracy of the f state and further enhancement of the Kondo effect. It is shown that the pressure dependent degeneracy of the f state is a key factor to understand the pressure dependence of TN, Kondo effect, magnetoresistance, and the peak structure in the temperature dependence of resistivity.