The phenomenon of temperature-induced itinerant electron metamagnetism in a zero external field is of the same nature as the widely investigated metamagnetic transitions induced by magnetic fields (external or internal). Recently, temperature-induced itinerant metamagnetism was discovered in the rareearth intermetallic RCo$_3$ compounds. Systematic investigations of the RCo$_3$ series made it possible to determine many specific features of this new phenomenon and to formulate criteria to reveal such transitions in other magnetic materials as well. This paper presents a brief review of the existing works and original results on temperature-induced itinerant-electron metamagnetism in substituted RCo$_3$ compounds.
75.90.+w Other topics in magnetic properties and materials
64.90.+b Other topics in equations of state, phase equilibria, and phase transitions
65.90.+i Other topics in thermal properties of condensed matter
$^1$Department of General Physics and Condensed Matter Physics, Faculty of Physics, Moscow State University, Moscow, 119991, Russia
$^2$Department of Magnetism, Faculty of Physics, Moscow State University, Moscow, 119991, Russia
$^3$State Center for Condensed Matter Physics, Moscow, 115569, Russia
$^4$Military Aviation Engineering University, Voronezh, 394064, Russia
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