CeRu2Al10中自旋能隙内精细结构的存在
Existence of Fine Structure inside Spin Gap in CeRu2Al10
摘要：
通过测量CeRu 2 Al 10的磁化强度和电阻率，研究了磁场对CeRu 2 Al 10自旋能隙态的影响.我们发现，磁场H//c的磁化曲线在T_0 =27 K以下的H ~*~4 T处出现类变磁异常，而H//a和H//b的磁化曲线没有异常。在Ts~5 K时，I//c的电阻率的肩部通过施加高于5 T的纵向磁场来抑制。在~5 K以下，Hkc的磁电阻也出现了许多反常现象.所得到的磁相图在T_0以下至少由两个或三个相组成。这些结果有力地表明，在最近的非弹性中子散射实验中观察到的激发能为8 meV的自旋能隙态中，在低能侧存在精细结构。
英文摘要：
We investigate the magnetic field effect on the spin gap state in CeRu2Al10 by measuring the magnetization and electrical resistivity. We found that the magnetization curve for the magnetic field H//c shows a metamagnetic-like anomaly at H*~4 T below T_0=27 K, but no anomaly for H//a and H//b. A shoulder of the electrical resistivity at Ts~5 K for I//c is suppressed by applying a longitudinal magnetic field above 5 T. Many anomalies are also found in the magnetoresistance for Hkc below ~5 K. The obtained magnetic phase diagram consists of at least two or three phases below T_0. These results strongly indicate the existence of a fine structure at a low energy side in a spin gap state with the excitation energy of 8 meV recently observed in the inelastic neutron scattering experiments.
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