Long-Time Variation in Magnetic Structure of Ce_0.98La_0.02Ir₃Si₂: Effect of Randomness on Time Variation

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Kiyoichiro Motoya¹^,, Taketo Moyoshi¹^,, and Masaaki Matsuda²

+ Affiliations

¹Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan²Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6393, U.S.A.

Received August 7, 2013; Accepted December 2, 2013; Published January 20, 2014

A long-time variation in the magnetic structure of Ce_0.98La_0.02Ir₃Si₂ has been studied by magnetization and time-resolved neutron scattering measurements. CeIr₃Si₂ is the first material in which the long-time variation in magnetic structure was observed in three-dimensional uniform magnets. Similar long-time variations in magnetic structure have been observed in several uniform materials. In order to clarify whether the long-time variations in the magnetic structure of these materials do not originate from randomness due to unexpected impurities or imperfections, the time variation behavior in a material with embedded randomness has been examined. The time variations observed in the magnetization and neutron scattering measurements of Ce_0.98La_0.02Ir₃Si₂ are basically the same as those observed in CeIr₃Si₂. Present results have shown that a peculiar long-time variation in the magnetic structure of CeIr₃Si₂ is not caused by inevitable randomness in a sample but is its intrinsic property.

https://doi.org/10.7566/JPSJ.83.024708

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Long-Time Variation in Magnetic Structure of Ce_0.98La_0.02Ir₃Si₂: Effect of Randomness on Time Variation