非中心对称EuRhGe $_3$和EuIrGe $_3$单晶的磁性和复合磁性phase diagram
Magnetic properties and complex magnetic phase diagram in non centrosymmetric EuRhGe$_3$ and EuIrGe$_3$ single crystals
摘要：
本文报道了两种Eu基化合物单晶EuIrGePDMATHABMM和EuRhGePDMATHABMM的磁性质，从磁化强度、电输运、热容量和$^{151}$ Eu穆斯堡尔谱推断。这些先前已知的化合物以非中心对称的、四元、$I4mm$、BaNiSnPDMATHABMM型结构结晶.用In作助熔剂，用高温溶液法生长了EuIrGePDMATHABMM和EuRhGePDMATHABMM单晶。在$T_{\rm N1}$ = 12.4 K和$T_{\rm N2}$ = 7.3 K时，EuIrGe $_3$表现出两种磁有序.而EuRhGe的$_3$则表现出单一的磁性转变，其$T_{\rm N}$ = 12 K. $^{151}$ Eu穆斯堡尔谱的级联过渡从顺磁到无公度振幅调制，随后由一个等矩反铁磁相在较低的温度下在EuIrGe $_3$，具有实质性的一阶字符的过渡的证据。另一方面，$^{151}$ Eu穆斯堡尔谱在4.2和9 K的EuRhGe $_3$提出了一个单一的磁性转变的证据。在这两种化合物中，观察到电流密度$J\parallel$ [001]的超带隙，其随横向磁场增强。测量到14 T的磁化强度显示了场致跃迁的发生，这在磁传输数据中也有很好的记录。从这些数据构建的磁相图是复杂的，揭示了在$H-T$相空间中存在许多相。
英文摘要：
We report the magnetic properties of two Eu based compounds, single crystalline EuIrGe$_3$ and EuRhGe$_3$, inferred from magnetisation, electrical transport, heat capacity and $^{151}$Eu Mössbauer spectroscopy. These previously known compounds crystallise in the non-centrosymmetric, tetragonal, $I4mm$, BaNiSn$_3$-type structure. Single crystals of EuIrGe$_3$ and EuRhGe$_3$ were grown using high temperature solution growth method using In as flux. EuIrGe$_3$ exhibits two magnetic orderings at $T_{\rm N1}$ = 12.4 K, and $T_{\rm N2}$ = 7.3 K. On the other hand EuRhGe$_3$ presents a single magnetic transition with a $T_{\rm N}$ = 12 K. $^{151}$Eu Mössbauer spectra present evidence for a cascade of transitions from paramagnetic to incommensurate amplitude modulated followed by an equal moment antiferromagnetic phase at lower temperatures in EuIrGe$_3$, the transitions having a substantial first order character. On the other hand the $^{151}$Eu Mössbauer spectra at 4.2 and 9 K in EuRhGe$_3$ present evidence of a single magnetic transition. In both compounds a superzone gap is observed for the current density $J\parallel$ [001], which enhances with transverse magnetic field. The magnetisation measured up to 14 T shows the occurrence of field induced transitions, which are well documented in the magnetotransport data as well. The magnetic phase diagram constructed from these data is complex, revealing the presence of many phases in the $H-T$ phase space.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
