T Sasakawa et al 2002 J. Phys.: Condens. Matter 14 L267 doi:10.1088/0953-8984/14/12/106
T Sasakawa, T Suemitsu, J Kitagawa, O Sologub, P Salamakha and T Takabatake1
Show affiliationsWe have synthesized CeRhP, aiming at breaking new ground as regards the CeRhPn (Pn = pnictogen) system. X-ray powder diffraction analysis shows that CeRhP crystallizes into the tetragonal LaPtSi-type structure. Both the magnetic susceptibility and thermopower exhibit a broad peak around 170 K, and the specific heat gives an electronic specific-heat coefficient of 30 mJ K-2 mol-1. These results indicate that CeRhP is a valence-fluctuating compound with a Kondo temperature of 400-500 K. The electrical resistivity shows a metallic behaviour, in contrast to the semimetal or semiconducting behaviour in CeRhSb and CeRhAs, with the orthorhombic ε-TiNiSi-type structure. This stresses the importance of the crystal symmetry to the gap formation in the CeRhPn series.
75.30.Cr Saturation moments and magnetic susceptibilities
61.50.Ah Theory of crystal structure, crystal symmetry; calculations and modeling
72.15.Jf Thermoelectric and thermomagnetic effects
75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena
Issue 12 (1 April 2002)
Received 6 February 2002, in final form 19 February 2002
Published 15 March 2002
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