High Magnetic Transition Temperature and Semiconductor-like Transport Properties of Mn-doped α-YbAlB4

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

Suzuki, S.^1 ; Tomita, T.^1 ; Shimura, Y.^1 ; Kuga, K.^2 ; Matsumoto, Y.^1 ; Nakatsuji, S.^1

Institute for Solid State Physics, University of Tokyo, Chiba, Kashiwa

277-8581, Japan^1

RIKEN SPring-8 Center, Sayo, Hyogo

679-5148, Japan^2

关键词: Heavy fermion compounds;    Heavy fermion systems;    Intermediate valence;    Magnetic orders;    Magnetic transition temperature;    Resistivity measurement;    Semiconductor like behaviors;    Temperature range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/683/1/012009/pdf
DOI  :  10.1088/1742-6596/683/1/012009

来源: IOP

【 摘 要 】

We succeeded in growing single crystals of α-YbAl1-xMnxB4by the substitution of Mn for the Al site in the intermediate-valence rare-earth heavy fermion system α-YbAlB4. We performed specific heat and resistivity measurement on single crystals of α-YbAl1-xMnxB4(x = 40). In the specific heat measurement on α-YbAl0.60Mn0.40B4, a sharp peak was observed at magnetic transition temperature TM= 9.7(6) K. The resistivity measurements on x = 0.40 also show a semiconductor-like behavior in the entire temperature range from 2 - 300 K. An inclination change was also observed at 10(1) K in resistivity measurement. These results indicate a magnetic order. The magnetic transition temperature is quite high compared to its temperatures observed in the other Yb-based heavy fermion compounds.