In an attempt further understand the nature of magnetic interactions in these compounds, we prepared a polycrystalline sample LaSrMnTiO, and then studied carefully their magnetocaloric effect and critical behavior based on analyzing the magnetization versus magnetic-field data, M(H). Here, LaSrMnTiO was prepared by conventional solid-state reaction at 1300 °C for 24 h in air. Magnetic measurements were performed on a superconducting quantum interference device magnetometer. Spin dynamics was also investigated by means of electron spin resonance (ESR) spectroscopy (a JES-TE300) working at 9.2 GHz.
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