Orlova Anna, Blinder Rémi, Kermarrec Edwin, Dupont Maxime, Laflorencie Nicolas, Capponi Sylvain, Mayaffre Hadrien, Berthier Claude, Paduan-Filho Armando, Horvatić Mladen
Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France.
Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, 31062 Toulouse, France.
Phys Rev Lett. 2017 Feb 10;118(6):067203. doi: 10.1103/PhysRevLett.118.067203. Epub 2017 Feb 9.
By measuring the nuclear magnetic resonance (NMR) T_{1}^{-1} relaxation rate in the Br (bond) doped DTN compound, Ni(Cl_{1-x}Br_{x}){2}-4SC(NH{2})_{2}(DTNX), we show that the low-energy spin dynamics of its high magnetic field "Bose-glass" regime is dominated by a strong peak of spin fluctuations found at the nearly doping-independent position H^{*}≅13.6 T. From its temperature and field dependence, we conclude that this corresponds to a level crossing of the energy levels related to the doping-induced impurity states. Observation of the local NMR signal from the spin adjacent to the doped Br allowed us to fully characterize this impurity state. We have thus quantified a microscopic theoretical model that paves the way to better understanding of the Bose-glass physics in DTNX, as revealed in the related theoretical study [M. Dupont, S. Capponi, and N. Laflorencie, Phys. Rev. Lett. 118, 067204 (2017).PRLTAO0031-900710.1103/PhysRevLett.118.067204].
通过测量掺溴（键合）的DTN化合物Ni(Cl_{1 - x}Br_{x}){2}-4SC(NH{2}){2}（DTNX）中的核磁共振（NMR）T{1}^{-1}弛豫率，我们表明其高磁场“玻色玻璃”态的低能自旋动力学由在几乎与掺杂无关的位置H^{*}≅13.6 T处发现的强自旋涨落峰主导。从其对温度和磁场的依赖性，我们得出这对应于与掺杂诱导杂质态相关的能级的交叉。对与掺杂的Br相邻的自旋的局部NMR信号的观察使我们能够全面表征这种杂质态。因此，我们对一个微观理论模型进行了量化，这为更好地理解DTNX中的玻色玻璃物理铺平了道路，正如相关理论研究[M. 杜邦、S. 卡波尼和N. 拉弗洛伦西，《物理评论快报》118, 067204 (2017). PRLTAO0031 - 900710.1103/PhysRevLett.118.067204]所揭示的那样。
