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对SrAl12O19:Pr3+中4f2→4f2电偶极跃迁强度的参量化进行了研究.考虑明确的4f5d组态成分与4f2跃迁能级混杂对4f2组态内跃迁的影响.引入新的强度参数Tkq,参数值由3P0能级的相关实验数据拟合.利用拟合的参数T33和T53计算1S0向下各能级发射的跃迁强度,计算值与实验及Judd-Ofelt理论的结果进行了比较.
关键词:
12O19:Pr3+')" href="#">SrAl12O19:Pr3+
宇称态混杂
4f5d组态
强度参数 相似文献
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磁通钉扎性能对GdBa2Cu3O7-δ超导块材的实际应用具有重要的影响, 而引入合适的第二相粒子可以改善GdBa2Cu3O7-δ 超导块材的磁通钉扎性能.本文采用顶部籽晶熔融织构法成功地制备出纳米微粒BaFe12O19(<100 nm)掺杂的超导块材, 样品的最终组分为Gd123+ 0.4 Gd211+ x BaFe12O19 (x=0, 0.2 mol%, 0.4 mol%, 0.8 mol%)+ 10 wt%Ag2O+ 0.5 wt%Pt. 通过研究不同掺杂量的BaFe12O19微粒对GdBa2Cu3O7-δ 超导块材微观结构和超导性能的影响, 结果表明当掺杂量为0.2 mol%时, 样品的临界电流密度几乎在整个外加磁场下都有明显的提高.在零场下, 临界电流密度达到5.5× 104 A/cm2. 纳米微粒BaFe12O19不仅可以保持掺杂前的化学组成, 作为有效的钉扎中心存在于超导块材中, 并且能够改善Gd2BaCuO5粒子的分布和细化Gd2BaCuO5粒子, 使Gd2BaCuO5粒子的平均粒径由未掺杂时的1.4 μ m减小到掺杂后的0.79 μ m, 进而提高了超导块材的临界电流密度和俘获磁场, 明显提高了GdBa2Cu3O7-δ 超导块材的超导性能.临界温度TC也有所提升, 并能够维持在92.5 K左右. 该结果为进一步研究纳米磁通钉扎中心的引入并改善GdBa2Cu3O7-δ 超导块材的性能有着重要的意义. 相似文献
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以Al2(SO4)3·18H2O、尿素为原料,采用水热-热解法制备了球形α-Al2O3粉体。以自制α-Al2O3、Y2O3及CeO2为原料,固相法制备了白光LED用Y2.93Al5O12∶0.07Ce3+黄色荧光粉,通过X射线衍射(XRD)、扫描电镜(SEM)、X射线能谱(EDS)及荧光光谱(PL)等对产物的物相、形貌及光致发光性能进行了表征。结果表明:水热-热解法制备出了物相纯净、分散性良好的球形α-Al2O3粉体,以该α-Al2O3为原料,合成出可被460 nm蓝光有效激发,发射光谱为峰值在550 nm宽带的Y2.93Al5O12∶0.07Ce3+荧光粉,色坐标为(0.453,0.531 9),采用GSAS软件对Y2.93Al5O12∶0.07Ce3+荧光粉的XRD图进行了Rietveld结构精修,精修图与XRD测试图完全吻合,Y,Al,Ce,O四元素均匀地分布在黄色荧光粉产物中,Y2.93Al5O12∶0.07Ce3+黄色荧光粉的激发光谱由两个部分组成,在340和460 nm处有两个非常明显的吸收峰,Ce3+的4f能级由于自旋-耦合而劈裂为两个光谱支项2F7/2和2F5/2,其中2F5/2为基谱项。340 nm的激发峰对应于2F5/2→5D5/2的跃迁,460 nm的激发峰属于2F7/2→5D3/2的跃迁,并且460 nm处的激发强度强于340 nm处激发强度。以460 nm为监测波长得到的发射光谱,最强发射峰位于550 nm,Y2.93Al5O12∶0.07Ce3+荧光粉是一种适用于白光LED的高性能黄色荧光粉。 相似文献
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利用红外光源浮区法生长出大尺寸、高质量的磁失措自旋冰化合物Dy2Ti2O7单晶体.X射线衍射实验证实晶体具有面心立方结构,空间群为Fd3m,晶胞参数a=1.0112(2) nm,[111]和[400]方向X射线衍射摇摆曲线半高宽分别仅为0.07°和0.05°.直流磁化率与温度关系测量给出晶体的Van Vleck顺磁因子为2.46×10-5 m3/mol,有效磁矩μeff=10.24(4)μB,Cure-Weiss温度ΘCW=1.1 K,揭示Dy2Ti2O7具有弱的铁磁性.对磁性起源的综合分析表明,该自旋冰晶体磁性质主要来源于磁偶极相互作用,且相关最近邻长程偶极相互作用能量标度Dnn=3.00 K.
关键词:
2Ti2O7')" href="#">Dy2Ti2O7
浮区法晶体生长
关联电子系统
自旋冰 相似文献
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采用快速液相烧结法制备BiFeO3和Bi0.95Dy0.05Fe1-xCoxO3 (x=0, 0.05, 0.1, 0.15)陶瓷样品. 实验结果表明: 所有样品的主衍射峰与纯相BiFeO3相符合且具有良好的晶体结构, 随着Co3+掺杂量的增大, Bi0.95Dy0.05Fe1-xCoxO3样品的主 衍射峰由双峰(104)与(110)逐渐重叠为单峰(110), 当掺杂量x>0.05时, 样品呈现正方晶系结构; SEM形貌分析可知: Dy3+, Co3+共掺杂使BiFeO3晶粒尺度由原来的3—5 μ减小到约1 μ. 室温下, BiFeO3样品表现出较弱的铁磁性, 随着Dy3+和Co3+掺杂, BiFeO3样品的铁磁性显著提高. 在外加磁场为30 kOe的作用下, Bi0.95Dy0.05Fe1-xCoxO3 (x=0.05, 0.1, 0.15)的Mr分别为0.43, 0.489, 0.973 emu/g; MS分别为0.77, 1.65, 3.08 emu/g. BiFeO3和Bi0.95Dy0.05Fe1-xCoxO3样品磁矩M随着温度T的升高而逐渐减小, Dy掺杂使BiFeO3样品的TN由644 K升高到648 K, 而TC基本没有变化. Dy和Co共掺杂导致BiFeO3样品磁相变温度TC由870 K降低到780 K, 其TC变化主要取决于Fe-O-Fe反铁磁超交换作用的强弱和磁结构的相对稳定性.
关键词:
铁磁电材料
磁滞回线
磁相变温度 相似文献
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采用脉冲激光沉积技术,在单晶SrTiO3基底上外延生长了一系列名义结构为p×(NdBa2Cu3O7-δ(m)/YBa2Cu3O7-δ(n))的多层膜和准多层膜(单元层NdBa2Cu3O7-δ较厚而YBa2Cu3O7-δ呈非连贯的岛状分布,m,n为激光脉冲数,p为重复周期).样品的超导转变温度在87—91 K范围,具体大小取决于不同的调制结构,多层膜的重复周期越大,层状界面越多,超导转变温度就越低.磁传输测量表明,准多层的样品不仅具有较高的超导转变温度,而且具有较强的磁通钉扎性能,77K零场下的临界电流密度高达4×106 A/cm2,显示出良好的应用前景.
关键词:
2Cu3O7-δ')" href="#">NdBa2Cu3O7-δ
多层膜
磁通钉扎
临界电流密度 相似文献
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通过对La0.8Sr0.2Mn1-yCoyO3(y≤02)饱和磁矩和输运的测量,研究了Co对La0.8Sr0.2MnO3的磁电阻影响机制.结果表明,在La0.8Sr0.2Mn1-yCoyO3(y≤02)中Co3+离子是低自旋态.由于Mn3+—O—Co3+—O—Mn3+类型的磁交换与Mn3+-Mn4+离子间双交换作用相比较弱,Curie温度TC附近的磁电阻随着Co掺杂量的增加而降低.与此相反,由于Co2+离子与eg巡游电子的反铁磁交换耦合作用,低温区间的磁电阻随着Co掺杂量的增加而升高.
关键词:
低自旋
磁电阻
磁交换作用 相似文献
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We have measured the resistivity of textured Bi1.84Pb0.4Sr2Ca2Cu3Oy silver-clamped thick films as a function of temperature, current density ranging from 10 to 1×103 A/cm2 and magnetic field up to 0.3 T. We find that the effective activation energy Ue follows Ue(T,J,H)=U0(1−T/Tp)mln(Jc0/J)H− with m=1.75 for Hab-plane and 2.5 for Hc-axis and =0.76 for Hab and 0.97 for Hc, for the current density regime above 100 A/cm2, where Tp is a function of applied magnetic field and current density. This result suggests the effective activation energy Ue be correlated with the temperature, current density and magnetic field. The possible dissipative mechanisms responsible for the temperature, current density and magnetic field dependence of the effective activation energy are discussed. 相似文献
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Anomalous magnetotransport phenomena have been observed in θ-(BEDT-TTF)2I3 crystals at temperatures below 15 K. The magnetoresistance M : (1) is a linear function of the magnetic field H, (2) is not affected by the angle between the electric current and the magnetic field, (3) but depends on the magnetic field orientation with respect to the crystal axis. Magnetoresistance is expressed as M = (aH2a + bH2b + cH2c)0-3/2/H in terms of H = (Ha, Hb, Hc), the zero field resistivity 0, and parameters a, b, and c which are independent of temperature and magnetic field. We have found that b a > c. Magnetoresistance up to 40 is observed for H = 7T along the b-axis at T = 1.5K. 相似文献
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A. J. J. van Dalen M. R. Koblischka R. Griessen M. Jirsa G. Ravi Kumar 《Physica C: Superconductivity and its Applications》1995,250(3-4):265-274
Superconducting current densities js and dynamic relaxation rates Q d ln js/d In(dBe/dt), where dBe/dt is the sweep rate of the external magnetic field Be, were measured as a function of temperature (5 K < T < 65 K) in magnetic fields up to 7 T on a twin-free DyBa2Cu3O7−δ single crystal by means of a high-sensitivity capacitance torque magnetometer. Above 15 K, we observe a “fishtail” effect, i.e. a pronounced minimum in the js(Be) curve at fields around Be = 1 T. The relaxation rate Q shows an anomalous increase at low fields which is correlated to the minimum in the js(Be) curve. Both the js versus Be and Q versus Be data are used as input parameters into the generalized inversion scheme developed by Schnack et al. [Phys. Rev. B 48 (1993) 13178] to calculate the true critical current density jc which is by definition independent of relaxation effects. Interestingly, the jc(Be, T) curves derived in this way do not show a minimum. This points clearly to a dynamic contribution to the fishtail effect. The true critical current density jc(Be, T) decreases weakly with increasing Be over the entire measured temperature and field range, as expected for single-vortex pinning. This indicates that the observed fishtail effect is not caused by a crossover from single-vortex pinning to pinning of flux bundles. The temperature dependence of jc is in good agreement with the predictions of a model based on single-vortex pinning caused by spatial fluctuations in the charge-carrier mean free path. 相似文献
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A. I. Tovstolytkin N. A. Belous I. V. Lezhnenko 《Journal of magnetism and magnetic materials》1994,130(1-3):293-296
We present here the detailed analysis of the magnetic behavior of the Co0.53Ga0.47 alloy, especially at temperatures above the freezing temperature Tf = 10 K. Low field static magnetization measurements were performed by using the SQUID magnetometer in the temperature range 5–65 K and magnetic fields up to 100 Oe. The temperature dependence of the field cooled susceptibility πFC(T) at T > Tf has an anomaly, which is displayed in the double change of the curvature near Ts = 24 K. The data of magnetization MFC in an external field H lie on a universal curve MFC(H/T) at temperatures Tf < T < Ts. The plots of π-1FC(T) and non-linear magnetic susceptibility πnlFC(T-3) are linear lines in the temperature range Tf−Ts. The strong deviation of π-1FC(T) and πnlFC(T-3) from straight line, taking place at T Ts, indicates that Ts is an upper temperature limit of the classical superparamagnetic behavior with the constant cluster moment. The results suggest that such phenomena may be fairly universal for spin glasses. 相似文献
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P. C. Canfield B. K. Cho D. C. Johnston D. K. Finnemore
M. F. Hundley
《Physica C: Superconductivity and its Applications》1994,230(3-4):397-406The magnetization of single-crystal HoNi2B2C has been measured as a function of applied field (H) and temperature in order to probe the interplay between superconductivity and magnetism in this complex layered system. The normal-state magnetic susceptibility of HoNi2B2C is highly anisotropic with a Curie-Weiss-like temperature dependence for H applied perpendicular to the c-axis and with a much weaker temperature dependence for H applied parallel to the c-axis, indicating that the Ho+3 magnetic moments lie predominately in the tetragonal a−b plane below 20 K. High-field magnetization (2000 Oe), low-field magnetization (20 Oe) and zero-field specific heat all give an antiferromagnetic ordering temperature of TN=5.0 K. Remarkably, in 20 Oe applied field both superconductivity (Tc=8.0 K) and antiferromagnetism (TN=5.0 K) clearly make themselves manifest in the magnetization data. From these magnetization data a phase diagram in the H−T plane was constructed for both directions of applied field. This phase diagram shows a non-monotonic temperature dependence of Hc2 with a deep minimum at TN=5 K. The high-field magnetization data for H applied perpendicular to the c-axis also reveal a cascade of three phase transitions for T < 5 K and H < 15 000 Oe, contributing to the rich H versus T phase diagram for HoNi2B2C at low temperatures. 相似文献
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MnAs0.88P0.12 has been studied by powder neutron diffraction in external magnetic fields up to 15.2 kOe and temperatures down to 4.2 K. MnAs0.88P0.12 takes the MnP type atomic arrangement and exists in para-, ferro- and different (essentially) helimagnetic states. The observation of a double 000± satellite at 4.2 K < T 70 K adds further evidence to the chain of arguments for distinction between the helimagnetic states H'a (4.2 K < T < TS,1 ≈ 70 K) and Ha (TS,2 ≈ 180 K < T < TN = (243 ± 5) K). External magnetic fields at 4.2 K < T < 70 K evoke a new magnetic state, which is also characterized by a satellite doublet, and is tentatively designated H'a,fan. 相似文献
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Xiaoyun Yu Xiao Zhang Qi Shi Shangjie Tian Hechang Lei Kun Xu Hideo Hosono 《Frontiers of Physics》2019,14(4):43501
We study the magnetocaloric effect (MCE) in van der Waals (vdW) crystal CrBr3. Bulk CrBr3 exhibits a second-order paramagnetic-ferromagnetic phase transition with TC = 33 K. The maximum magnetic entropy change −ΔSM near TC is about 7.2 J·kg−1·K−1 with the maximum adiabatic temperature change ΔTmaxad = 2.37 K and the relative cooling power RCP= 191.5 J·kg−1 at μ0H = 5 T, all of which are remarkably larger than those in CrI3. These results suggest that the vdW crystal CrBr3 is a promising candidate for the low-dimensional magnetic refrigeration in low temperature region. 相似文献
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S.L. Yuan J.L. Chen X. Sun Y. Chen Z. Huang P. Tang G. Li S. Wang L.R. Ding F.T. Wang Z.M. Liu Z.Y. Chen Q. Chen W.F. Yuan B.J. Gao 《Physics letters. A》1998,240(6):349-353
The in-plane normal state resistance Rn(T, H) in an overdoped La2−xSrxCuO4 crystal (x = 0.24) has been measured in magnetic fields up to 20 T parallel to the c-axis. The Rn(T) curves in constant fields show a quadratic behavior in a wide range of temperature above Tc(H). Some characteristic features in Rn(H) are observed. In the low-field region Rn(H) increases with increasing H, reaches a maximum and then decreases with further increasing H. Possible origins for the observed unusual Rn(T, H) behavior are discussed. 相似文献
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G. Triscone M. S. Chae M. C. de Andrade M. B. Maple 《Physica C: Superconductivity and its Applications》1997,290(3-4):188-205
We have investigated the reversible mixed-state magnetization M of three lanthanum substituted Bi1.95Sr2.05−xLaxCuOy (Bi-2201) ceramic samples having different critical temperatures Tc ranging from 20.0 to 35.5 K. As for the Bi2Sr2CaCu2O8+δ (Bi-2212) phase, we found that anisotropy of Bi-2201 is large. A manifestation of this anisotropy is the field independent magnetization M* observed at a temperature T*. In the framework of the London model, and including thermal fluctuations of vortices, we found for the temperature dependence of the penetration depth λab(T) = λab(0)[1 − (T/Tc0)n]−1/2, with n 1.7 and λab (T = 0) 4000 Å. The estimated upper critical fields μ0Hc2,c are of the order of 10 T. We observe a peculiar negative slope M/T at low temperature and sufficiently high external magnetic field. This feature seems to be a characteristic of the Bi-2201 phase. However, we do not know whether it is associated with the superconducting mixed-state. A small amount of magnetic impurities could also be responsible for this behavior. Finally, the behavior of the reversible magnetization of the Bi-2201 samples investigated, which are situated at the optimal and in the overdoped region, did not indicate any unusual temperature dependence for the upper critical field Hc2,c. 相似文献