Ultrasonic study on chiral symmetry of novel vibronic state broken by applying magnetic fields

2016 Fiscal Year Final Research Report

• Project/Area Number: 26287083
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Hiroshima University
• Principal Investigator: Suzuki Takashi 広島大学, 先端物質科学研究科, 教授 (00192617)
• Co-Investigator(Kenkyū-buntansha): 中村 文彦 久留米工業大学, 工学部, 教授 (40231477) ; 鬼丸 孝博 広島大学, 先端物質科学研究科, 准教授 (50444708)
• Co-Investigator(Renkei-kenkyūsha): ISHII Isao 広島大学, 大学院先端物質科学研究科, 助教 (20444713)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 超音波分光 / バイブロニック / カイラル / 多極子 / 巨大振幅原子振動 / 強磁場 / 極低温

Outline of Final Research Achievements

We measured the rotational invariance effect and the anisotropy effect in elastic mode C44 and the rotational invariance effect in elastic mode (C11-C12)/2 of single-crystalline PrT2Zn20 (T=Ir, Rh) using the special ultrasonic measurement system with the dilution refrigerator and the hybrid magnet which is constructed by High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University. We found, for the first time, the spontaneous anisotropy in the rotational invariance effect for both samples PrT2Zn20 (T=Ir, Rh) between the higher and lower magnetic fields than the critical field at which the magnetic field induced phase appears. This result supports our prediction that the chiral symmetry in the novel vibronic state must be broken by the magnetic field.

Free Research Field

低温物理学，固体物性，超音波物性