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The diamond anvil cell-based high-pressure technique is a unique tool for creating new states of matter and for understanding the physics underlying some exotic phenomena.In situ sensing of spin and charge properties under high pressure is crucially important but remains technically challenging.While the nitrogen-vacancy(NV)center in diamond is a promising quantum sensor under extreme conditions,its spin dynamics and the quantum control of its spin states under high pressure remain elusive.In this study,we demonstrate coherent control,spin relaxation,and spin dephasing measurements for ensemble NV centers up to 32.8 GPa.With this in situ quantum sensor,we investigate the pressure-induced magnetic phase transition of a micron-size permanent magnet Nd_2Fe_(14)B sample in a diamond anvil cell,with a spatial resolution of ~2μm,and sensitivity of ~20 μT/Hz~(1/2). This scheme could be generalized to measure other parameters such as temperature,pressure and their gradients under extreme conditions.This will be beneficial for frontier research of condensed matter physics and geophysics. 相似文献
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金属卤化物MCl2(M=Pb2+,Cd2+,Co2+)分别与苯并噻唑(btz)在浓盐酸中、80 ℃下反应,合成了3种有机-无机杂化化合物:(btzH)[(PbCl3)] (1),(btzH)2[CdCl4]·2H2O (2)和(btzH)2[CoCl4]·2H2O (3),其中化合物2和3结构相似。对化合物1~3进行了粉末衍射、红外和紫外光谱、元素分析、热重分析以及X射线单晶衍射表征。荧光测试发现:化合物1~3在393 nm处有发射峰,该荧光来源于苯并噻唑环中电子的π…π跃迁。 相似文献
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声光可调滤光器(Acousto-optic tunable filter,AOTF)的衍射效率不仅与功率信号源的质量、声光晶体氧化碲(TeO_2)的切型有关,而且压电超声换能器的结构以及其阻抗匹配网络也对AOTF的衍射效率有很大影响。本文对X切型铌酸锂(LiNbO_3,LN)四层镀膜压电超声换能器的等效模型进行了分析,确定了声光介质存在时换能器的阻抗特性,利用射频微波仿真软件,设计了电感-电容复合匹配网络。将换能器压合在TeO_2上,用复色光作为光源进行了声光衍射实验,经仿真与实验验证表明,该匹配电路可以有效的改善压电换能器的阻抗特性,提高换能器带宽,提高能量传输效率,AOTF衍射效率最高可达92.67%。 相似文献
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It is well known that potassium ion channels have higher permeability than K ions, and the permeable rate of a single K ion channel is about 108 ions per second. We develop a hierarchical model of potassium ion channel permeation involving ab initio quantum calculations and Brownian dynamics simulations, which can consistently explain a range of channel dynamics. The results show that the average velocity of K ions, the mean permeable time of K ions and the permeable rate of single channel are about 0.92nm/ns, 4.35ns and 2.30 ×10^8 ions/s, respectively. 相似文献
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用四(4-吡啶基)卟啉(H~2TPyP)与乙酰丙酮钇(III)[Y(acac)~3.H~2O]反应,生成单层配合物Y(TPyP)(acac)。将其与4,5-二(庚基)二氰基苯混和,后者在DBU催化下发生四聚反应,生成混杂[2,3,9,10,16,17,23,24-八(庚基)酞菁][四(4-吡啶基)卟啉]合钇(III)二层配合物Y(TPyP)[Pc(C~7H~1~5)~8]。该化合物用紫外-可见、近红外、红外及质谱等进行了表征,并用循环伏安法(CV)和差示脉冲法(DP)研究了其电化学性质。 相似文献