RSn_{1+x} Ge_{1-x}化合物（R=Gd，Tb，Er; x=0.1）的磁性、磁热和磁输运性质
Magnetic, magnetocaloric and magnetotransport properties of RSn_{1+x}Ge_{1-x} compounds (R=Gd, Tb, Er; x=0.1)
摘要：
通过磁化强度、热容和电阻率的测量，研究了RSn_（1 + x）Ge_（1-x）（R=Gd，Tb，Er; x=0.1）系列化合物的磁性、磁热和磁输运性质。结果表明，所有化合物均为正交晶系，空间群为Cmcm（No.63）。磁化率和热容数据表明，所有的化合物是反铁磁的。在GdSn 1.1Ge 0.9和TbSn 1.1Ge 0.9的情况下，θp的大负值表明涉及强反铁磁相互作用，这也反映在磁化等温线中。另一方面，ErSn1.1Ge0.9显示出弱的反铁磁相互作用。对热容数据进行了拟合，并估算了θD和γ值。在这三种化合物中，ErSn_（1.1）Ge_（0.9）在50 kOe的磁场下表现出9.5 J/kg K的磁熵变和3.2 K的绝热温变。在不同的温度制度的电阻率数据进行了分析，并已确定的主导贡献。所有的化合物都表现出很小但正的磁电阻。
英文摘要：
We have studied the magnetic, magnetocaloric and magnetotransport properties of RSn1+xGe1-x(R=Gd, Tb, Er; x=0.1) series by means of magnetization, heat capacity and resistivity measurements. It has been found that all the compounds crystallize in the orthorhombic crystal structure described by the centrosymmetric space group Cmcm (No. 63). The magnetic susceptibility and heat capacity data suggest that all the compounds are antiferromagnetic. Large negative values of θp in case of GdSn1.1Ge0.9 and TbSn1.1Ge0.9 indicate that strong antiferromagnetic interactions are involved, which is also reflected in the magnetization isotherms. On the other hand ErSn1.1Ge0.9 shows weak antiferromagnetic interaction. The heat capacity data have been analyzed by fitting the temperature dependence and the values of θD and γ have been estimated. Among these three compounds, ErSn1.1Ge0.9 shows considerable magnetic entropy change of 9.5 J/kg K and an adiabatic temperature change of 3.2 K for a field of 50 kOe. The resistivity data in different temperature regimes have been analyzed and the dominant contributions have been identified. All the compounds show small but positive magnetoresistance.
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