Magnetic-field dependence of Schottky specific heat in the 1/1 Zn-Sc-Tm approximant

13th International Conference on Quasicrystals

Dolinek, J.^1

J. Stefan Institute, University of Ljubljana, Faculty of Mathematics and Physics, Jamova 39, Ljubljana

SI-1000, Slovenia^1

关键词: Approximants;    Crystalline electric fields;    Hund's rule;    Interacting electrons;    Low-temperature specific heat;    Magnetic field dependences;    Schottky effect;    Single ion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/809/1/012012/pdf
DOI  :  10.1088/1742-6596/809/1/012012

来源: IOP

【 摘 要 】

The analysis of low-temperature specific heat of rare-earth (RE)-containing quasicrystals and periodic approximants and consequent interpretation of their electronic properties in the T → 0 limit is frequently hampered by the Schottky effect, where crystalline electric fields lift degeneracy of the RE-ion Hund's rule ground state and introduce additional contribution to the specific heat. When the low-temperature specific heat C is analyzed in the C/T versus T2scale, the Schottky effect (a single-ion property in a system of non-interacting electrons) and the electron-electron interactions both yield a very similar upturn in the T → 0 limit. The origin of the upturn can be unraveled from the magnetic-field dependence of the low-temperature specific heat.