NMR and mu-SR study on the critical phenomena in the Bose-glass phase with Tc=0

Tc=0时玻色玻璃相临界现象的NMR和mu-SR研究

• 批准号: 21540344
• 负责人: GOTO Takayuki
• 金额: $ 3万
• 依托单位: Sophia University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21540344/
• 关键词: ボースグラス; NMR; μSR; 量子スピン系; 量子スピン; スピンギャップ; 不純物誘起磁気転移

(CH_3)_2CHNH_3Cu(Cl_xBr_<1-x>)_3 abbreviated IPACu(Cl_xBr_<1-x>)_3 is a mixed system of spin-gap compounds IPACuCl_3 and IPACuBr_3. This mixed system is reported by macroscopic measurements to show a magnetic order when the value of x is between the quantum critical points(QCPs) 0.44 and 0.87. We have investigated microscopically the ground state of the samples x=0.40, 0.45 and 0.50 which are located near the QCP of xc=0.44, by Muon Spin Relaxation(μSR) and NMR measurements. For x=0.40, mSR measurements in zero and longitudinal fields have shown that the spin fluctuation shows a significant slowing down with decreasing temperature, although the magnetic order does not appear down to T=15 mK, indicating that the ground state is an exotic one rather than a gapped one. For x=0.45 and 0.50, mSR and NMR measurements do not show any magnetic order at low temperatures, indicating that the QCP is larger than the reported value of x_c=0.44.

(CH_3)_2CHNH_3Cu(Cl_xBr_<1-x>)_3 缩写为 IPACu(Cl_xBr_<1-x>)_3 是自旋间隙化合物 IPACuCl_3 和 IPACuBr_3 的混合体系，通过宏观测量报告了该混合体系，显示了磁序。当 x 的值在量子临界点（QCP）0.44 和 0.87 之间时，我们进行了研究。通过Muon自旋弛豫(μSR)和NMR测量，微观上样品x=0.40、0.45和0.50的基态位于xc=0.44的QCP附近，对于x=0.40，零场和纵向场的mSR测量显示。尽管磁序没有出现到 T=15 mK，但自旋波动随着温度的降低而显着减慢，这表明基态是一种奇异的状态，而不是对于 x=0.45 和 0.50，mSR 和 NMR 测量在低温下没有显示任何磁序，表明 QCP 大于 x_c=0.44 的报告值。

项目成果

^ Cu-NMR study on High-Tc Superconductor La_ Ba_xCuO_4

^<63>高温超导体La_<2-x> Ba_xCuO_4的Cu-NMR研究

• DOI: 10.1088/1742-6596/302/1/012010
• 发表时间: 2011
• 作者: Y. Shindo; T. Goto; K. Nakamura; T. Takao; T. Adachi; Y. Koike
• 通讯作者: Y. Koike

Change in magnetic ground states in nonmagnetic-impurity-doped spin-gap systems TlCuMg_xCl_3 using muon spin relaxation

使用μ子自旋弛豫改变非磁性杂质掺杂自旋间隙系统 TlCu<1-x>Mg_xCl_3 中的磁性基态

• 发表时间: 2011
• 作者: Takao Suzuki; Motoki Yamada; Yasuyuki Ishii; Isao Watanabe; Takayuki Goto; Hidekazu Tanaka; Kenya Kubo
• 通讯作者: Kenya Kubo

Pressure effect on magnetic ground states in Tl(CulixMgx)Cl3 with x=0.015 probed by muon-spin-rotation

通过μ子自旋旋转探测x=0.015的Tl(CulixMgx)Cl3中磁性基态的压力效应

• 发表时间: 2010
• 作者: Takao Suzuki; Isao Watanabe; Fumiko Yamada; Yasuyuki Ishii; Kazuki Ohishi; Risdiana; Takayuki Goto; Hidekazu Tanaka
• 通讯作者: Hidekazu Tanaka

Evidence for continuous change of spin states between impurity-induced order and pressure-induced order in TlCu_ Mg_ Cl_3 probed via muon spin rotation

通过μ子自旋旋转探测TlCu_<0.985> Mg_<0.015> Cl_3中自旋态在杂质诱导有序和压力诱导有序之间连续变化的证据

• DOI: 10.1103/physrevb.80.064407
• 发表时间: 2009
• 作者: Takao Suzuki; Isao Watanabe; Fumiko Yamada; Yasuyuki Ishii; Kazuki Ohishi; Risdiana; Takayuki Goto;Hidekazu Tanaka
• 通讯作者: Hidekazu Tanaka

24aPS-81量子スピン系Tl(Cu_ Mg_x) Cl_3(0.0047

24aPS-81 量子自旋系统Tl(Cu_<1-x> Mg_x) Cl_3(0.0047<x<0.015)中μ子自旋弛豫所见的基态II

• 发表时间: 2012
• 作者: 鈴木栄男; 渡邊功雄; 山田基樹; 後藤貴行; 田中秀数; 久保謙哉
• 通讯作者: 久保謙哉