~(23)Na and ~(75)As NMR study of antiferromagnetism and spin fluctuations in NaFeAs single crystals

L. Ma; G. F. Chen; Dao-Xin Yao; J. Zhang; S. Zhang; T.-L. Xia; Weiqiang Yu

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~(23)Na and ~(75)As NMR study of antiferromagnetism and spin fluctuations in NaFeAs single crystals

机译：〜（23）Na和〜（75）As的反铁磁性和NaFeAs单晶自旋涨落的NMR研究

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We report the ~(23)Na and ~(75)As nuclear magnetic resonance (NMR) studies on NaFeAs single crystals. The structure transition temperature Ts (55 K) and the spin density wave (SDW) transition temperature T_(Sdw) (40.5 K) are determined by the NMR line splits. The spin-lattice relaxation rates indicate that the spin fluctuations are strongly enhanced just below Ts and drive a second order SDW transition. A fluctuating feature of the SDW ordering is also seen below the T(SDw)- We further performed high-pressure NMR studies on NaFeAs, and found that the T_(sdw) increases by ~7 K and the magnetic moment increases by ~30% under 2.5 GPa pressure.

机译：我们报道了NaFeAs单晶的〜（23）Na和〜（75）As核磁共振（NMR）研究。通过NMR线分裂来确定结构转变温度Ts（55 K）和自旋密度波（SDW）转变温度T_（Sdw）（40.5 K）。自旋晶格弛豫率表明自旋波动刚好在Ts以下大大增强，并驱动二阶SDW跃迁。在T（SDw）下方也可以看到SDW顺序的波动特征。我们进一步对NaFeAs进行了高压NMR研究，发现T_（sdw）增加了〜7 K，磁矩增加了〜30％在2.5 GPa压力下。

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来源
《Physical review》 |2011年第13期|p.132501.1-132501.4|共4页
作者
L. Ma; G. F. Chen; Dao-Xin Yao; J. Zhang; S. Zhang; T.-L. Xia; Weiqiang Yu;
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作者单位

Department of Physics, Renmin University of China, Beijing 100872, China;

Department of Physics, Renmin University of China, Beijing 100872, China;

State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China;

School of Energy and Power Engineering, North China Electric Power University, Beijing 102206, China;

Department of Physics, Renmin University of China, Beijing 100872, China;

Department of Physics, Renmin University of China, Beijing 100872, China;

Department of Physics, Renmin University of China, Beijing 100872, China;

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正文语种 eng
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关键词
superconducting materials; nuclear magnetic resonance and relaxation;

机译：超导材料;核磁共振与弛豫;

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2. Commensurate Itinerant Antiferromagnetism in BaFe(2)AS(2): As-75-NMR Studies on a Self-Flux Grown Single Crystal [J] . Kitagawa K, Katayama N, Ohgushi K, Journal of the Physical Society of Japan . 2008,第11期

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7. 23Na and 75As NMR Study of Antiferromagnetism and Spin Fluctuations on NaFeAs Single Crystals [O] . Ma, L., Chen, G. F., Yao, Dao-Xin, 2011

机译：23Na和75as NmR研究反铁磁性和自旋波动 NaFeas单晶

~(23)Na and ~(75)As NMR study of antiferromagnetism and spin fluctuations in NaFeAs single crystals

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