Coexistence of Kondo effect and Ferromagnetism in Ce1.5Nd1.5Al

International Conference on Recent Trends in Physics 2016

Singh, Durgesh^1 ; Patidar, Manju Mishra^1 ; Gangrade, Mohan^1 ; Ganesan, V.^1

UGC DAE Consortium for Scientific Research, Indore

452001 MP, India^1

关键词: Ferromagnetic transitions;    Heat-capacity data;    Heavy fermion behavior;    Magnon excitations;    Polycrystalline;    Sommerfeld coefficient;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/755/1/012038/pdf
DOI  :  10.1088/1742-6596/755/1/012038

来源: IOP

【 摘 要 】

The possibility for a coexistence of Kondo effect and ferromagnetism in Ce1.5Nd1.5Al has been studied using heat capacity and resistivity. The sample is of polycrystalline in nature. Heat capacity data confirms the heavy fermion behavior of this compound with a Sommerfeld coefficient γ = 190mJ/mol-K2and Debye temperature ∼ 180K. An upturn in resistivity and heat capacity observed near ∼ 24K is attributed to the paramagnetic to ferromagnetic transition as reported. Kondo like behavior is observed below 10K and vanishes for magnetic fields of the order of 2T. Around 60K a prominent jump or cusp like behaviour is seen and observed to be robust against magnetic fields up to 14T. Heat capacity below 20K is found to be consistent with equation Cp(T) = γ T + βT3+ αT3/2e-Δ/Tthat signifies the presence of a gap in magnon excitation energy of the order of 70K.