The magnetic phase diagram of rare-earth perovskite compound,GdScO3,has been investigated by magnetization and heat capacity.The system undergoes an antiferromagnetic phase transition at TN=2.6 K,with an easy axis of ...The magnetic phase diagram of rare-earth perovskite compound,GdScO3,has been investigated by magnetization and heat capacity.The system undergoes an antiferromagnetic phase transition at TN=2.6 K,with an easy axis of magnetization along the a axis.The magnetization measurements show that it exists a spin-flop transition around 0.3 T for the applied field along the a axis.The critical magnetic field for the antiferromagnetic-to-paramagnetic transition is near 3.2 T when temperature approaches zero.By scaling susceptibilities,we presume this point(B=3.2 T,T=0 K)might be a fieldinduced quantum critical point and the magnetic critical fluctuations can even be felt above TN.展开更多
The magnetic properties of iron pnictide superconductors with magnetic rare-earth ions under strong magnetic field are investigated based on the cluster self-consistent field method. Starting from an effective Heisenb...The magnetic properties of iron pnictide superconductors with magnetic rare-earth ions under strong magnetic field are investigated based on the cluster self-consistent field method. Starting from an effective Heisenberg model, we present the evolution of magnetic structures on magnetic field in RFeAsO（R = Ce, Pr, Nd, Sm, Gd, and Tb） and RFe_2As_2（R =Eu） compounds. It is found that spin-flop transition occurs in both rare-earth and iron layers under magnetic field, in good agreement with the experimental results. The interplay between rare-earth and iron spins plays a key role in the magneticfield-driven magnetic phase transition, which suggests that the rare-earth layers can modulate the magnetic behaviors of iron layers. In addition, the factors that affect the critical magnetic field for spin-flop transition are also discussed.展开更多
Detailed studies of the structures, magnetic properties and photodimerization of a series of formato-bridged MOFs with the general formula M2(HCOO)3(4,4'-bpe)3(H20)3(X) (4,4'-bpe = 4,4'-bipyridylethylene, ...Detailed studies of the structures, magnetic properties and photodimerization of a series of formato-bridged MOFs with the general formula M2(HCOO)3(4,4'-bpe)3(H20)3(X) (4,4'-bpe = 4,4'-bipyridylethylene, M = Mn (l-X-), X- = CIO4, NO3, BF4, I-, Br-; M = Co (2-X-), X- = C104, NO3; M = Zn (3-X-), X- = NO3) were reported. Careful magnetic measurements on an ori- ented single crystal of 1-C104 determined the spin-flop magnetic phase diagram and some intrinsic parameters, such as the in- tralayer coupling d, the anisotropy field HA and the exchange field HE. Different anions can remarkably tune the magnetic properties of l-X-, especially the critical fields of the spin-flop transition. Compound 2-C104 remained paramagnetic down to 2K.展开更多
Detailed studies of the structures, magnetic properties and photodimerization of a series of formato-bridged MOFs with the general formula M2(HCOO)3(4,4′-bpe)3(H2O)3(X) (4,4′-bpe = 4,4′-bipyridylethylene, M = Mn (1...Detailed studies of the structures, magnetic properties and photodimerization of a series of formato-bridged MOFs with the general formula M2(HCOO)3(4,4′-bpe)3(H2O)3(X) (4,4′-bpe = 4,4′-bipyridylethylene, M = Mn (1-X-), X- = ClO4-, NO3-, BF4-, I-, Br-; M = Co (2-X-), X- = ClO4-, NO3-; M = Zn (3-X-), X- = NO3-) were reported. Careful magnetic measurements on an oriented single crystal of 1-ClO4- determined the spin-flop magnetic phase diagram and some intrinsic parameters, such as the intralayer coupling J, the anisotropy field HA and the exchange field HE. Different anions can remarkably tune the magnetic properties of 1-X-, especially the critical fields of the spin-flop transition. Compound 2-ClO4- remained paramagnetic down to 2 K.展开更多
Based on single Cesium atoims trapped in a 1064 nm microscopic optical trap we have exhibited a single qubit encoded in the Cesium ＂clock states＂. The single qubit initialization, detection and the fast state rotati...Based on single Cesium atoims trapped in a 1064 nm microscopic optical trap we have exhibited a single qubit encoded in the Cesium ＂clock states＂. The single qubit initialization, detection and the fast state rotation with high efficiencies are demonstrated and this state manipulation is crucial for quantmn information processing. The ground ~ates Rabi flopping rate of 229.0 ± 0.6 kHz is realized hy a two-photon Raman process. A clock states dephasing time of 3.0 ± 0.7 ms is measured, while all irreversible homogeneous dephasing time of 124 ± 17 ms is achieved by using the spin-echo technique. This well-controlled single atom provides an ideal quantmn qubit and quantmn node for quantum information processing.展开更多
基金supported by the National Natural Science Foundation of China(21002006,20452002)Special Program for Key Basic Research of the Ministry of Science and Technology,China(2004-973-36)~~
基金The work at SUSTech was supported by the National Natural Science Foundation of China(Grant No.11974157)Part of this work was also supported by the National Natural Science Foundation of China(Grant No.11875265)+1 种基金the Scientific Instrument Developing Project of the Chinese Academy of Sciences(3He-based neutron polarization devices)the Institute of High Energy Physics,the Chinese Academy of Sciences.Kan X C and Tian M L were supported by the National Natural Science Foundation of China(Grant No.51802002).
文摘The magnetic phase diagram of rare-earth perovskite compound,GdScO3,has been investigated by magnetization and heat capacity.The system undergoes an antiferromagnetic phase transition at TN=2.6 K,with an easy axis of magnetization along the a axis.The magnetization measurements show that it exists a spin-flop transition around 0.3 T for the applied field along the a axis.The critical magnetic field for the antiferromagnetic-to-paramagnetic transition is near 3.2 T when temperature approaches zero.By scaling susceptibilities,we presume this point(B=3.2 T,T=0 K)might be a fieldinduced quantum critical point and the magnetic critical fluctuations can even be felt above TN.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11104274,11274310,and 11474287)the Fundamental Research Funds for the Central Universities,China(Grant No.27R1310020A)
文摘The magnetic properties of iron pnictide superconductors with magnetic rare-earth ions under strong magnetic field are investigated based on the cluster self-consistent field method. Starting from an effective Heisenberg model, we present the evolution of magnetic structures on magnetic field in RFeAsO（R = Ce, Pr, Nd, Sm, Gd, and Tb） and RFe_2As_2（R =Eu） compounds. It is found that spin-flop transition occurs in both rare-earth and iron layers under magnetic field, in good agreement with the experimental results. The interplay between rare-earth and iron spins plays a key role in the magneticfield-driven magnetic phase transition, which suggests that the rare-earth layers can modulate the magnetic behaviors of iron layers. In addition, the factors that affect the critical magnetic field for spin-flop transition are also discussed.
基金support from the National Natural Science Foundation of China (21101093, 90922033)the Natural Science Foundation of Jiangsu Province (BK2011548)
文摘Detailed studies of the structures, magnetic properties and photodimerization of a series of formato-bridged MOFs with the general formula M2(HCOO)3(4,4'-bpe)3(H20)3(X) (4,4'-bpe = 4,4'-bipyridylethylene, M = Mn (l-X-), X- = CIO4, NO3, BF4, I-, Br-; M = Co (2-X-), X- = C104, NO3; M = Zn (3-X-), X- = NO3) were reported. Careful magnetic measurements on an ori- ented single crystal of 1-C104 determined the spin-flop magnetic phase diagram and some intrinsic parameters, such as the in- tralayer coupling d, the anisotropy field HA and the exchange field HE. Different anions can remarkably tune the magnetic properties of l-X-, especially the critical fields of the spin-flop transition. Compound 2-C104 remained paramagnetic down to 2K.
文摘Detailed studies of the structures, magnetic properties and photodimerization of a series of formato-bridged MOFs with the general formula M2(HCOO)3(4,4′-bpe)3(H2O)3(X) (4,4′-bpe = 4,4′-bipyridylethylene, M = Mn (1-X-), X- = ClO4-, NO3-, BF4-, I-, Br-; M = Co (2-X-), X- = ClO4-, NO3-; M = Zn (3-X-), X- = NO3-) were reported. Careful magnetic measurements on an oriented single crystal of 1-ClO4- determined the spin-flop magnetic phase diagram and some intrinsic parameters, such as the intralayer coupling J, the anisotropy field HA and the exchange field HE. Different anions can remarkably tune the magnetic properties of 1-X-, especially the critical fields of the spin-flop transition. Compound 2-ClO4- remained paramagnetic down to 2 K.
基金Acknowledgements This work was supported by the National Basic Research Program of China （Grant No. 2012CB921601） and the National Natural Science Foundation of China （Grants Nos. 11125418, 91336107, 61275210, 61227902, and 61121064）.
文摘Based on single Cesium atoims trapped in a 1064 nm microscopic optical trap we have exhibited a single qubit encoded in the Cesium ＂clock states＂. The single qubit initialization, detection and the fast state rotation with high efficiencies are demonstrated and this state manipulation is crucial for quantmn information processing. The ground ~ates Rabi flopping rate of 229.0 ± 0.6 kHz is realized hy a two-photon Raman process. A clock states dephasing time of 3.0 ± 0.7 ms is measured, while all irreversible homogeneous dephasing time of 124 ± 17 ms is achieved by using the spin-echo technique. This well-controlled single atom provides an ideal quantmn qubit and quantmn node for quantum information processing.
