Anomalous spin fluctuations near the Mott transition in Caz-xSrx RuO_4

Caz-xSrx RuO_4 中莫特跃迁附近的异常自旋涨落

• 批准号: 12640340
• 负责人: YOSHIZAWA Hideki
• 金额: $ 2.37万
• 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 (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640340/
• 关键词: rutenate; 2d super conductor; neutron scattering; 量子臨界点; スピン揺動; 中性子散乱実験

To study spin fluctuations in p-wave superconductor Sr_2RuO_4 which includes no Cu ions, we grow a large single crystal samples, and studied inelastic scattering spectra at the Japanese research reactor JRR-3M in JAERI, Toaki, Japan. The temperature dependence of the inelastic spin fluctuation spectra for 1.3 meV < E < 25 meV was observed and analyzed. The dynamical susceptibility increases below 〜 100K, and shows a sharp drop in the energy spectra. The energy width of the dynamical susceptibility follows a linear relation with temperature, but it accompanies with a large residual width 1 〜 8 meV, indicating its anomalous behavior of spin fluctuations.

为了研究不含 Cu 离子的 p 波超导体 Sr_2RuO_4 中的自旋涨落，我们生长了大型单晶样品，并在日本远秋 JAERI 的日本研究堆 JRR-3M 中研究了非弹性散射光谱。观察并分析了1.3 meV < E < 25 meV非弹性自旋涨落谱的温度依赖性。动态磁化率在〜100K以下增加，并且能谱急剧下降。动力学磁化率的能量宽度与温度呈线性关系，但伴随着1〜8 meV的大残余宽度，表明其自旋涨落的反常行为。

项目成果

R. Kajimoto: "Commensurate-incommensurate transition in the melting process of orbital ordering in Pr_<0.5>Ca_<0.5>MnO_3 : A neutron diffraction study"Phys. Rev B. 63. -212407 (1) - (4) (2001)

R. Kajimoto：“Pr_<0.5>Ca_<0.5>MnO_3 轨道有序熔化过程中的公度-不公度转变：中子衍射研究”Phys。

H.Takagiwa: "Coexistence of Superconductivity and (Anti-) Ferromangetism in RuSr_2YCu_2O_8"J. Phys. Soc. Jpn.. 70. 333-336 (2001)

H.Takagiwa：“RuSr_2YCu_2O_8 中超导性和（反）铁磁性的共存”J。

H. Takagiwa: "Coexistence of Superconductivity and (Anti-) Ferromangetism in RuSr_2YCu_2O_8"J. Phys. Soc. Jpn. 70. 333-336 (2001)

H. Takagiwa：“RuSr_2YCu_2O_8 中超导性和（反）铁磁性的共存”J。

M. Kubota: "Influence of Quasi-Bi-Stripe Charge Order on Resistivity and Magnetism in the Bilayer Manganite La_<2-2X>Sr_<1+2X>Mn_2O_7"J.Phys. Soc. Jpn. 69. 1986-1989 (2000)

M. Kubota：“准双带电荷顺序对双层锰矿 La_<2-2X>Sr_<1 2X>Mn_2O_7 中电阻率和磁性的影响”J.Phys。

M.Kubota: "Relation between crystal and magnetic structures of layered manganite La_<2-2x>Sr_<1+2x>Mn_2O_7(0.30<x<0.50)"J.Phys.Soc.Jpn.. 69. 1606-1609 (2000)

M.Kubota：“层状亚锰矿La_<2-2x>Sr_<1 2x>Mn_2O_7(0.30<x<0.50)的晶体和磁结构之间的关系”J.Phys.Soc.Jpn.. 69. 1606-1609 (2000)