  We have investigated the magnetic, dielectric and magnetodielectric (MDE)
behavior of a geometrically frustrated spin-chain system, Ca3Co1.4Rh0.6O6, in
the single crystalline form for different orientations. The results bring out
that the magnetic behavior of this compound is by itself interesting in the
sense that this compound exhibits an anisotropic glassy-like magnetic behavior
with a huge frequency dependence of ac susceptibility peak for an orientation
along the spin-chain in the range 30-60 K; this behavior is robust to
applications of large external magnetic fields (H) unlike in canonical
spin-glasses. The temperature dependence of dielectric constant also shows
strong frequency dependence with similar robustness to H. The isothermal
H-dependent dielectric results at low temperatures establishes anisotropic MDE
coupling. It is intriguing to note that there is a 'step' roughly at one-third
of saturation values as in the case of isothermal magnetization curves for same
temperatures (for orientation along spin-chain), a correlation hitherto
unrealized for geometrically frustrated systems.
