Low-temperature muon spin relaxation measurements on

119Sn NMR on the correlated semi-metal

“…This point is the equatorial singularity of site 2, but also includes some intensity near the middle for the site 1 shift distribution. Thus, we interpret the drop of 119 R 119 ð1=T 1 Þ faster than the linear-T Korringa law as being consistent with the 30 K energy gap reported from other measurements [2], and the partial recovery below 10 K (where 119 ð1=T 1 TÞ actually increases) as the onset of low-T fluctuations consistent with very recent mSR results [3]. In comparison, the La146 results for both 119 Sn and 139 La show clear Korringa-like metallic bahavior.…”

“…Investigations of specific heat C=T and rðTÞ by Strydom et al [2] in different magnetic fields exhibit a strong magnetic field dependence and yet recent muon-spin-relaxation measurements show that there is no static or induced magnetic ordering in Ce146 down to 50 mK [3]. In our previous 119 Sn NMR measurements [4] on Ce146 at a frequency of 28.5 MHz, we could confirm by spin-lattice relaxation rate results 119 ð1=T 1 Þ a low-temperature upturn qualitatively consistent with the specific heat results, which was interpreted as the onset of correlations.…”

Muon spin relaxation study of non-Fermi-liquid behavior near the ferromagnetic quantum critical point inCePd0.15Rh0.85

“…The stretched exponential form of the relaxation has also been used to fit the ZF-and LF-field SR data of many NFL systems such as U͑Cu, Pd͒ 5 , CePtSi 1−x Ge x , YbRh 2 Si 2 , and CeNi 9 Ge 4 , 40-43 but the Lorentzian form has been used for CeRu 4 Sn 6 and CeRu 4 Sb 12 . 44,45 The detailed discussion on the underlying physics for various values of ␤ can be found in Refs. 46 and 47.…”

“…It is interesting to compare these values with y = 1.6 observed for CePtSi 0.9 Ge 0.1 at 50 mK between 50 and 1000 G, and y = 1.0 observed for YbRh 2 Si 2 at 20 mK between 10 and 400 G. 41,42 On the other hand, CeRu 4 Sn 6 , exhibiting NFL behavior with a spin gap, has a very small value of y = 0.17. 44 It is to be noted that we also tried to fit the longitudinal-field data by keeping ͑i͒ ␤, A BG , and A 0 fixed, and ͑ii͒ ␤ and A BG fixed to the ZF values at 0.1 K. However these constraints did not yield good fitting results, indicating that the observed field dependence of ␤ in Fig. 8͑b͒ is an intrinsic property of CePd 0.15 Rh 0.85 , i.e., it is not due to an artifact arising from the fitting procedure.…”

Electronic and magnetic properties of the rare earth intermetallic compounds RRu4Sn6 (R=Nd, Sm, Gd, Tb, Dy and Ho)

“…The R and Ru atoms each have a unique atomic site in the unit cell, while the Sn atoms occupy two different positions [1]. In CeRu 4 Sn 6 , observations of an anomalous upturn in the specific heat at low temperature [2] together with a semi-metallic electrical resistivity [3] has led to further investigations that subsequently established non-Fermiliquid behaviour and strong electron correlations in this compound [4] without any sign of magnetic ordering down to very low temperatures [5]. In GdRu 4 Sn 6 , a signature of magnetic order was detected [3] in its magnetic susceptibility.…”