Vacancy Waves in a Quantum Solid ィイD13ィエD1He

量子固体中的空位波

• 批准号: 08240218
• 负责人: MAMIYA Takayoshi
• 金额: $ 44.99万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-08240218/
• 关键词: Quantum Solid; Spin Polaron; Depressurized Solid; Tunnel Effect; Dislocation; Zero Point Vacancy Wave; Solid Helium; Amorphous Solid; 量子固体; 空格子; 固体ヘリウム3; 量子効果; 固体^3He; 磁気焼鈍

We aim at verifying that the vacancies move as vacancy waves because of tunneling of ィイD13ィエD1He atoms in solid ィイD13ィエD1He. We studied the vacancy waves in three categories. (1) specific heat, (2) motion of dislocation and (3) zero point vacancy wave. (1) A spin polaron is a region where ィイD13ィエD1He spins are aligned ferromagnetically around a vacancy. We have observed an excess specific heat over the specific heat due to the exchange interaction. We checked whether it arises from spin polarons due to vacancies by applying a strong magnetic field. The results show that the excess specific heat does not arise from spin polarons but the amorphous solid ィイD13ィエD1He layers on the substrate. (2) We studied the motion of dislocations in solid ィイD13ィエD1He by the torsional oscillator technique. We studied the temperature dependence of the critical strain amplitude where the dissipation starts to increase.We have obtained clear evidence of the crossover from thermal to quantum tunneling of the dislocations through the Peierls potential. (3) We have been performing the experiment of pulsed NMR for depressurized solid in the fields of 8-15T. We aim at observing a decrease in TィイD21ィエD2 and increases in TィイD22ィエD2 and the diffusion constant due to the appearance of zero-point vacancy waves. So far, we have not yet confirmed the presence of zero-point vacancy waves.

我们的目的是验证空位波的移动，因为在固体的D13氦D1 He中的D13氦D1 He原子的隧穿。我们研究了三种类型的空位波。(1)比热，（2）位错运动，（3）零点空位波。(1)自旋极化子是一个区域，其中D13自旋D1 He自旋铁磁性地排列在空位周围。我们已经观察到由于交换相互作用，比热超过比热。我们通过施加一个强磁场来检验它是否来自于空位引起的自旋极化子。结果表明，过量比热不是来自自旋极化子，而是来自衬底上的非晶态固体层D13-D1 He。(2)本文用扭转振子技术研究了固体氘氚D_（13）氘D_（11）He中位错的运动。我们研究了耗散开始增加的临界应变振幅的温度依赖性，得到了位错通过Peierls势从热隧穿到量子隧穿的明显证据。(3)我们在8- 15 T磁场下进行了减压固体的脉冲核磁共振实验。我们的目标是观察到由于零点空位波的出现，T_（21）_（22）_（21）_（22）_（21）_（22）_到目前为止，我们还没有证实零点空位波的存在。

项目成果

T.Mamiya et al.: "Low Frequency Susceptibility of High-Density bcc solid ^3He"J.Low Temp Phys. 115. 71-87 (1999)

T.Mamiya 等人：“高密度 bcc 固体 ^3He 的低频敏感性”J.Low Temp Phys。

H.Kambara,T.Mamiya: "Specific Heat due to amorphous surface in solid ^3He" Europhysics Letter. 46(印刷中). (1999)

H.Kambara、T.Mamiya：“固体 ^3He 中非晶表面的比热”欧洲物理学通讯 46（出版中）。

H.Kambara et al.: "Specific Heat due to Amorphous Surface in Solid ^3He"Eurohys. Lett. 46. 499-504 (1999)

H.Kambara 等人：“固体 ^3He 中非晶表面产生的比热”Eurohys。

T.Mamiya,S.Abe: "Low Frequency Susceptibility of High-Density Solid ^3He" J.Low Temperature Physics. 115,1/2(印刷中). (1999)

T.Mamiya, S.Abe：“高密度固体 ^3He 的低频磁化率”J.LowTemperaturePhysics 115,1/2（出版中）。

Y.Miura,T.Mamiya: "Molar-Volume Dependence of the Pressure in bcc Solid ^3He" J.Low Temperature Physics. 116(印刷中). (1999)

Y.Miura、T.Mamiya：“bcc 固体 ^3He 中压力的摩尔体积依赖性”J.LowTemperaturePhysics 116（出版中）。