Ising-Type Magnetic Anisotropy Derived by $\Gamma_{7}^{(1)}$ Crystal Electric Field Ground State in Tetragonal CeRu2Al2B: 11B and 27Al NMR Studies

• Published in: Journal of the Physical Society of Japan 2012-07, Vol.81 (7), p.073705-073705-4
• Main Authors: Matsuno, Haruki, Nohara, Hiroki, Kotegawa, Hisashi, Matsuoka, Eiichi, Tomiyama, Yo, Sugawara, Hitoshi, Harima, Hisatomo, Tou, Hideki
• Format: Article
• Language: English
• ISSN: 0031-9015; 1347-4073
• DOI: 10.1143/JPSJ.81.073705

The magnetic properties of the new tetragonal compound CeRu 2 Al 2 B have been investigated by 11 B and 27 Al nuclear magnetic resonance (NMR) measurements. In the paramagnetic state, the Knight shift exhibits a strong Ising-type magnetic anisotropy. In the ferromagnetic order state, the ordered moment is estimated to be ${\approx}1.8{\mbox{--}}1.85$$\mu_{\text{B}}$/Ce from the magnitudes of the internal fields at the B and Al sites. These results strongly suggest that the Ising-like ferromagnetic ground state arises from the $\Gamma_{7}^{(1)}$ ground state in CeRu 2 Al 2 B.