Investigation of spin glass quantum critical material and its quantum critical phenomena

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400347
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: Li Dexin 東北大学, 金属材料研究所, 助教 (40281985)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: スピングラス / 量子臨界状態 / フラストレーション効果 / ｆ電子系化合物

Outline of Final Research Achievements

Evident effects of element composition and external magnetic field on the spin glass behavior are observed for many ternary uranium and rare earth compounds. In particular, spin glass system U2Pd1+xSi3-x polycrystals and Ce2CuSi3 single crystal are synthesized and their basic physical properties are measured down to 1.8 K. As a result, the spin glass transition temperature of U2Pd1+xSi3-x decreases as the Si content increases. The optimum Si content that is highly likely to achieve a quantum critical state for U2Pd1+xSi3-x is found. On the other hand, it is confirmed that the spin glass characteristics of Ce2CuSi3 is changed by the external magnetic field. The spin glass transition temperature of Ce2CuSi3 moves toward the low temperature side as the external magnetic field increases, and there is a large possibility to achieve a quantum critical state near 1.4 kOe.

Free Research Field

固体物理