Torque and magnetization measurements in magnetic fields $H$ up to 14 T were performed on CeCoIn$_5$ single crystals. The amplitude of the paramagnetic torque shows an $H^{2.3}$ dependence in the mixed state and an $H^{2}$ dependence in the normal state. In addition, the mixed-state magnetizations for both $H\parallel c$ and $H\parallel ab$ axes show anomalous behavior after the subtraction of the corresponding paramagnetic contributions as linear extrapolations of the normal-state magnetization. These experimental results point towards a nonlinear paramagnetic magnetization in the mixed state of CeCoIn$_5$, which is a result of the fact that both orbital and Pauli limiting effects dominate in the mixed state.
Magnetization and transport properties of single crystalline RPd${_2}$P${_2}$ (R=Y, La-Nd, Sm-Ho, Yb)
在高温富Pd和P溶液中生长出RPd ${_2}$ P ${_2}$（R=Y，La-Nd，Sm-Ho，Yb）单晶，并通过室温粉末X射线衍射、各向异性温度和场相关磁化强度以及温度相关面内电阻率测量进行表征。在这个系列中，YPd ${_2}$ P ${_2}$和LaPd ${_2}$ P ${_2}$和YbPd ${_2}$ P ${_2}$（含Yb $^{+2}$）是非局部力矩轴承，而CePd ${_2}$ P ${_2}$和PrPd ${_2}$ P ${_2}$在低温下具有沿晶体学c轴的铁磁组分。其余的系列表现出低温反铁磁有序。EuPd ${_2}$ P ${_2}$具有Eu $^{+2}$离子，并且EuPd ${_2}$ P ${_2}$和GdPd ${_2}$ P ${_2}$均具有与$L = 0$和$J=S=\frac{7}{2}$一致的各向同性顺磁磁化率，并且表现出多个磁跃迁。对于R=Eu-Dy，在零外加磁场下有多个$T>1.8$ K跃迁;对于R=Nd，Eu，Gd，Tb和Dy，在T=2.0 K时，$H<55$ k Oe有明显的变磁跃迁。用$L\neq 0$对大多数磁性稀土进行了测量，发现晶体电场（CEF）效应引起的各向异性很强。根据各向异性顺磁$θ_{ab}$和$ θ_{c}$值计算实验估计的CEF参数B $^2_0$，并与整个稀土系列的理论趋势进行比较。有序温度以及多晶平…
Magnetic and magnetoresistance behavior of Tb7Rh3, an intermetallic compound with a negative temperature coefficient of electrical resistivity in the paramagnetic state, and Paramagnetic Giant Magnetoresistance Phenomenon
直流磁化，电和磁电阻和热容量测量（2-300 K）的结果Tb 7 Rh 3，在Th 7 Fe 3型六方结构结晶，报告。在这种化合物中，磁有序集在约90 K，在低温下具有额外的转变，并且电阻率（R）的温度系数dR/dT在顺磁状态下在很宽的温度范围内为负。磁化结果表明，该化合物在磁场-温度相图中具有丰富的特征。主要强调的一点是，顺磁状态下的dR/dT的符号可以通过施加磁场而逐渐改变。结果，除了在磁有序状态下的巨磁阻行为之外，磁阻（MR）的幅度即使在室温附近（远高于磁有序温度）也相当大。与该系列的其他重稀土元素类似，这类化合物可以被归类为顺磁性巨磁阻系统。一种新的理论方法是必要的，以了解这一现象。
