Single crystal growth and heat capacity measurements of triangular lattice R2Pt6Ga15 (R =rare earth)

TMU International Symposium on "New Quantum Phases Emerging from Novel Crystal Structure"

Matsumoto, Y.^1 ; Ueda, T.^1 ; Ohara, S.^1

Department of Engineering Physics, Electronics and Mechanics, Graduate School of Engineering, Nagoya Institute of Technology, Aichi, Nagoya

466-8555, Japan^1

关键词: Heat capacity measurements;    Magnetic orders;    Powder x-rays;    Self-flux methods;    Triangular lattice;    Type structures;    Unit-cell volume;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/683/1/012035/pdf
DOI  :  10.1088/1742-6596/683/1/012035

来源: IOP

【 摘 要 】

We have succeeded in synthesizing the single crystal of R2Pt6Ga15(R=La-Nd, Sm- Lu) with hexagonal Sc0.67Fe2Si5-type structure using Ga self flux method. The crystal structure was confirmed by the powder X-ray method. The unit-cell volume V of R2Pt6Ga15follows the lanthanide concentration except R = Ce, Eu and Yb, indicating that the valences of R = La, Pr, Nd, Sm, Gd-Tm, and Lu ion are trivalent, whereas those of R = Ce, Eu and Yb ion are deviate from trivalent. We have measured the specific heat C(T) of R2Pt6Ga15. It is found that the magnetic order takes place in R2Pt6Ga15(R=Pr, Nd, Sm-Tm). Moreover, the multiple phase transitions were observed in R2Pt6Ga15(R = Nd, Eu, Gd and Ho).