Abstract
A new ternary platinum phosphide CePt3P was synthesized and characterized by means of magnetic, thermodynamic and transport measurements. The compound crystallizes in an antiperovskite tetragonal structure similar to that in the canonical family of platinum-based superconductors APt3P (A = Sr, Ca, La) and closely related to the noncentrosymmetric heavy fermion superconductor CePt3Si. In contrast to all the superconducting counterparts, however, no superconductivity is observed in CePt3P down to 0.5 K. Instead, CePt3P displays a coexistence of antiferromagnetic ordering, Kondo effect and crystalline electric field effect. A field-induced spin-flop transition is observed below the magnetic ordering temperature TN1 of 3.0 K while the Kondo temperature is of similar magnitude as TN1. The obtained Sommerfeld coefficient of electronic specific heat is γCe = 86 mJ/mol·K2 indicating that CePt3P is a moderately correlated antiferromagnetic Kondo lattice compound.
Highlights
A new ternary platinum phosphide CePt3P was synthesized and characterized by means of magnetic, thermodynamic and transport measurements
We report our successful synthesis of such a candidate compound CePt3P in the platinum-based phosphides APt3P family
Almost all peaks can be well indexed with the tetragonal structure with the space group P4/nmm (No 129), except for a tiny peak of an impurity phase around 31.4° which might be PtP2
Summary
A new ternary platinum phosphide CePt3P was synthesized and characterized by means of magnetic, thermodynamic and transport measurements. For a large family of layered 3d electron superconductors (SCs) such as the copper oxides[1] and iron pnictides[2], the spin fluctuations caused by strong 3d electron correlations play a vital role in the unconventional superconductivity Besides these 3d transition metal systems, several platinum-based SCs exhibit remarkably rich physical properties and have attracted considerable attention, partly owing to the moderately strong spin-orbit coupling of the platinum. It is interesting that among the platinum-based superconductors, the newly reported family of APt3P (A = Ca, Sr and La) shares the structural similarity with that of iron pnictides[11] These compounds crystallize in a tetragonal structure with space group P4/nmm (No 129) with stacking in the order of A-Pt6P-A along the c-axis. Correspondence and requests for materials should be addressed to J.C.
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