Field-induced quantum phase transitions studied by means of low-temperature magnetization, specific heat and dielectric measurements

通过低温磁化、比热和介电测量研究场致量子相变

• 批准号: 20244053
• 负责人: SAKAKIBARA Toshiro
• 金额: $ 26.79万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20244053/
• 关键词: 強相関電子系; 量子相転移; 磁化測定; 比熱測定; メタ磁性転移; 磁場誘起秩序; メタ磁性; 重い電子系物質; 価数転移; マルチフェロイクス; 三角格子; 磁力計; ダイマー系物質; 三重項状態; 強相関系; 極低温比熱測定; 強磁場

A quantum phase transition is a transition between different phases of matter at zero temperature. Contrary to the ordinary classical phase transitions which can be attained by decreasing temperature, quantum phase transitions can only be accessed by varying a controlling parameter such as magnetic field, pressure or chemical compositions at absolute zero temperature. Quantum phase transitions have attracted much attention because they describe abrupt changes in the ground state of many-body systems due to quantum fluctuations and exotic phases may appear. In this project, various magnetic-field-induced quantum phase transitions have been studied experimentally. For this purpose, we have developed a low-temperature magnetometer operating at low temperatures down to 50 mK in magnetic fields up to 17 T-a state of the art technology.

量子相变是零温度下物质不同相之间的转变。与可以通过降低温度来实现的普通经典相变相反，量子相变只能通过在绝对零温度下改变磁场、压力或化学成分等控制参数来实现。量子相变引起了人们的广泛关注，因为它们描述了由于量子涨落而引起的多体系统基态的突然变化，并且可能出现奇异的相。在该项目中，对各种磁场引起的量子相变进行了实验研究。为此，我们开发了一种低温磁力计，可在低至 50 mK 的低温和高达 17 T 的磁场中运行，这是最先进的技术。

项目成果

MnWO4のパルス磁場中誘電分極測定

脉冲磁场中MnWO4的介电极化测量

• 发表时间: 2008
• 作者: 鳴海康雄;古川裕次;熊谷健一;網代芳民;金道浩一;A. Lascialfari;F. Borsa;G.A. Timco;R.E.P. Winpenny;徳永将史;松永崇弘;萩原政幸;吉田紘行;木村尚次郎;太田有基;大隈俊哉;武田健一;石原祐子;三田村裕幸
• 通讯作者: 三田村裕幸

Unusual Low-Temperature Magnetization of a Cubic &Gamma;<SUB>3</SUB> Non-Kramers Doublet Ground State Compound PrMg<SUB>3</SUB>-Evidence of a Hybridization Effect

立方体的异常低温磁化

• DOI: 10.1143/jpsj.78.033705
• 发表时间: 2009
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: T. Morie;T. Sakakibara;H.S. Suzuki;H. Tanida and S. Takagi
• 通讯作者: H. Tanida and S. Takagi

PrFe4P12の熱膨張の磁場角度依存性

PrFe4P12 热膨胀的磁场角度依赖性

• 发表时间: 2008
• 作者: Yukihito Osada;et al.;M.Kando;澤博;M. Sasai;田山孝
• 通讯作者: 田山孝

Absence of Meissner State and Robust Ferromagnetism in the Superconducting State of UCoGe: Possible Evidence of Spontaneous Vortex State

• DOI: 10.1143/jpsj.79.083708
• 发表时间: 2010-07
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: K. Deguchi;E. Osaki;S. Ban;N. Tamura;Yasuyuki Simura;T. Sakakibara;I. Satoh;N. Sato

Magnetic Properties of Ce3Pd20Si6 at Very Low Temperatures

Ce3Pd20Si6 在极低温下的磁性

• DOI: 10.1088/1742-6596/200/1/012118
• 发表时间: 2010
• 期刊: J. Phys.:Conf. Ser.
• 作者: Mitamura H;Sakuraba T;Tayama T;Sakakibara T;Tsuduku S;Ano G;Ishii I;Akatsu M;Nemoto Y;Goto T;Kikkawa A and Kitazawa H
• 通讯作者: Kikkawa A and Kitazawa H