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Heavy fermion behavior in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>PrRh</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>B</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:mtext>C</mml:mtext></mml:mrow></mml:math>: Excitonic mass enhancement
We report magnetic and transport properties of a quaternary borocarbide ${\text{PrRh}}_{2}{\text{B}}_{2}\text{C}$ based on magnetization, resistivity, and specific-heat studies. This compound forms in ${\text{LuNi}}_{2}{\text{B}}_{2}\text{C}$-type tetragonal structure (space group $I4/mmm$) and does not exhibit magnetic ordering or superconductivity down to 0.5 K. The crystal-field analysis of specific-heat data suggests a singlet ground …