Field-tuned critical fluctuations in YFe2Al10: Evidence from magnetization, 27Al NMR, and NQR investigations
Field-tuned critical fluctuations in YFe2Al10: Evidence from magnetization, 27Al NMR, and NQR investigations
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DOI：
10.1103/physrevb.86.220401
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发表时间：
2012-10
影响因子：
3.7
通讯作者：
P. Khuntia;A. Strydom;L. S. Wu;M. Aronson;Frank Steglich;M. Baenitz
中科院分区：
文献类型：
--
作者：
P. Khuntia;A. Strydom;L. S. Wu;M. Aronson;Frank Steglich;M. Baenitz
我们报告的磁化强度，比热，和NMR调查YFe 2Al 10在很宽的温度范围内和磁场和零场（NQR）测量。磁化率、比热和自旋-晶格弛豫速率除以T（1/T1 T）遵循弱幂律（T^-0.4）温度依赖性，这是Fe磁矩临界涨落的特征。Sommerstrik-Wilson比值以及1/T1 T与chi（T）之间的线性关系表明该系统中存在铁磁关联。在Cp（T）中没有低于50 mK的磁性有序化，并且体数据和NMR数据的不寻常的温度和场标度与驱动系统达到量子临界的磁性不稳定性相关。系统的磁特性由场调谐，其中铁磁波动被抑制，并且随着磁场的增加观察到从量子临界到FL行为的交叉。
We report magnetization, specific heat, and NMR investigations on YFe2Al10 over a wide range in temperature and magnetic field and zero field (NQR) measurements. Magnetic susceptibility, specific heat and spin-lattice relaxation rate divided by T (1/T1T) follow a weak power law (T^-0.4) temperature dependence, which is a signature of critical fluctuations of Fe moments. The value of the Sommerfeld-Wilson ratio and linear relation between 1/T1T and chi(T) suggest the existence of ferromagnetic correlations in this system. No magnetic ordering down to 50 mK in Cp(T) and the unusual temperature and field scaling of the bulk and NMR data are associated with a magnetic instability which drives the system to quantum criticality. The magnetic properties of the system are tuned by field wherein ferromagnetic fluctuations are suppressed and a crossover from quantum critical to FL behavior is observed with increasing magnetic field.