High-Field Magnetization of CeRu2Al10

Details High-Field Magnetization of CeRu2Al10 High-Field Magnetization of CeRu2Al10

2010-05-27

arxiv.org/abs/1005.5079v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, to appear in JPSJ 79 (2010) No.7 or No.8

Scientific paper

The magnetization measurements of CexLa1-xRu2Al10 (x = 1, 0.75) under the high magnetic field were performed in order to obtain the information for the long-range order (LRO) in CeRu2Al10. We successfully obtained the magnetic phase diagram of these two compounds for the applied magnetic field along the a-axis which is the magnetization easy axis, and found that the LRO for x = 1 disappears at ~50 T which is the critical field to the paramagnetic phase. For x = 0.75, the critical magnetic field decreases to ~37 T by La substitution. The magnetic phase diagram and magnetization curve are qualitatively consistent with the recent Hanzawa's mean field calculation results obtained by assuming the dimer of Ce ions whose crystalline electric field ground state has a large magnetic anisotropy. These results support the singlet pair formation scenario recently proposed by Tanida et al.. We also pointed out the possibility of the appearance of the field-induced magnetic phase between ~40 T and ~50 T for x = 1.

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