Spin-glass-like behavior in heavy fermion compound Pr2CuSi3

• Main Authors: Luo, Ludwig, 羅正平
• Other Authors: Cheng Tien
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/75287731076661552995

碩士 === 國立成功大學 === 物理學系 === 86 === We report the magnetic susceptibility, specific heat, and electrical resisti-vity measurements of Pr2CuSi3 in this paper. The structure of Pr2CuSi3 is consistent with the hexagonal AlB2 type.From themagnetic susceptibility measurements we observe a apparent spin-glass-like behavior at about Tf = 8 K. This behavior exists until the apply magnetic fieldreaches 2 Tesla. On the other hand,we observe an enlargement of specific heat. The coefficientof the term linear in temperature in the specific heat γ of Pr2CuSi3 is 509 mJ/mole‧K2 which is much larger, over 500 times, than that of normal metals.Thisis because the Pr atoms are in Al-sites and Si and Cu atoms occupy the B-sites randomly in the hexagonal AlB2 type structure of Pr2CuSi3. Pr3+ ions are located on the l-ayers separated by sheets composed of Si and Cu atoms. The randomnessof Si and Cu introduces a vary It is these random Pr-Pr exchange interactions that give rise to the spin-glass-like behavior, and this accounts for the largeobserved γ value. This compound might be classified as a non-magnetic atom-disorder spin glass.