Electrical, Thermal, and Magnetic Properties of Single Crystal CaMn$_2$O$_4$ Marokite*

CaMn$_2$O$_4$ was first described [1] in 1963 as a natural mineral called Marokite. Since its discovery, it has been studied as a minor structural impurity phase in CMR- related CaMnO$_3$ and for its structural similarities to high-pressure phases of spinel-oxide compounds. However, little attention has previously been paid to physical properties beyond its temperature-dependent magnetization. We will present a detailed physical properties study of CaMn$_2$O$_4$ single crystals grown by the optical floating zone method. [2] These measurements, several of which display anisotropy as a result of an orthorhombic crystal structure, include electrical transport, thermal transport, thermal expansion, heat capacity, and magnetization. \newline [1] C. Gaudefroy, G. Jouravsky, F. Permingeat, Bull. Soc. Fran\c c. Min\'er. Crist. {\bf86} (1963) 359. [2] B. D. White, C. A. M. dos Santos, J. A. Souza, K. J. McClellan, J. J. Neumeier submitted to J. Cryst. Growth.