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Ferromagnetic Ground States with High Transition Temperatures in New Tetragonal Rare-Earth Compounds CeRu2Al2B and PrRu2Al2B
Department of Physics, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
1Center for Supports to Research and Education Activities, Kobe University, Kobe 657-8501, Japan
2Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan
(Received December 6, 2011; Accepted February 16, 2012; Published March 27, 2012)
We report on the discovery of ferromagnetic ground states in the newly synthesized tetragonal compounds CeRu2Al2B and PrRu2Al2B. Polycrystalline samples of these compounds were synthesized and their magnetization M(B) and electrical resistivity ρ(T) were measured as functions of the magnetic field B and the temperature T. CeRu2Al2B is a metallic compound with trivalent Ce ions and is classified into a Kondo-lattice system: a Kondo-like -ln
T dependence of ρ(T) is observed below 32 K. The cusp at TNCe = 14.3 K and the steep increase at approximately TCCe = 13 K observed in the magnetic susceptibility M/B(T) correspond to antiferromagnetic (AFM) and ferromagnetic (FM) transitions, respectively. TCCe is the second highest transition temperature of the Ce-based ferromagnet with no other magnetic elements. PrRu2Al2B is also a metallic compound with trivalent Pr ions. The M/B(T) of PrRu2Al2B shows a cusp at TNPr = 26 K and a steep increase at approximately TCPr = 11 K, indicating that AFM and FM transitions occur at TNPr and TCPr, respectively.
©2012 The Physical Society of Japan
KEYWORDS:CeRu2Al2B, PrRu2Al2B, ferromagnetic transition, antiferromagnetic transition, magnetization, magnetic susceptibility, electrical resistivity
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