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In order to study the basic superconductivity properties of R_2Pt_3Ge_5, we synthesized the single crystalline samples by the Pt–Ge self-flux method. R_2Pt_3Ge_5(R = La, Ce) were also grown for a systematic study. Zero-resistivity was observed in both the La-and Pr-based samples below the reported superconducting transition temperatures. However, magnetic susceptibility measurements showed low superconductivity volume fractions in both La_2Pt_3Ge_5 and R_2Pt_3Ge_5(less than2%). Ce_2Pt_3Ge_5 did not show any signature of superconductivity. From the specific heat measurements, we did not observe a superconducting transition peak in R_2Pt_3Ge_5, suggesting that it is not a bulk superconductor. The magnetic susceptibility and heat capacity measurements revealed two antiferromagnetic(AFM) orders in R_2Pt_3Ge_5 at T_(N1)= 4.2 K and T_(N2)= 3.5K, as well as a single AFM transition at TN= 3.8 K in Ce_2Pt_3Ge_5. 相似文献
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Broken Time-Reversal Symmetry in Superconducting Partially Filled Skutterudite Pr_(1-δ)Pt_4Ge_(12) 下载免费PDF全文
Time reversal symmetry(TRS)is a key symmetry for classification of unconventional superconductors,and the violation of TRS often results in a wealth of novel properties.Here we report the synthesis and superconducting properties of the partially filled skutterudite Pr_(1-δ)Pt_4Ge_(12).The results from x-ray diffraction and magnetization measurements show that the[Pt_4 Ge_(12)]cage-forming structure survives and bulk superconductivity is preserved below the superconducting transition temperature T_c = 7.80 K.The temperature dependence of both the upper critical field and the electronic specific heat can be described in terms of a two-gap model,providing strong evidence of multi-band superconductivity.TRS breaking is observed using zero Held muon-spin relaxation experiments,and the magnitude of the spontaneous field is nearly half of that in PrPt_4Ge_(12). 相似文献
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The structure and magnetic properties of rare-earth ions Tm3+Kagomé lattice Tm3Sb3Mg2O14 are studied by x-ray diffraction,magnetic susceptibility and muon spin relaxation (μSR) experiments.The existence of a small amount of Tm/Mg site-mixing disorder is revealed.DC magnetic susceptibility measurement shows that Tm3+magnetic moments are antiferromagnetically correlated with a negative Curie–Weiss temperature of-26.3 K.Neither long-... 相似文献
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