{'fraction_non_alphanumeric': 0.03458498023715415, 'fraction_numerical': 0.024703557312252964, 'mean_word_length': 4.788571428571428, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 1, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Structure, Magnetism, and Spin Dependent Magnetoresistance in Doped Two-Dimensional Sr/sub 2/CoO/sub 4/ Compounds

In this work, we report our studies on the structures, transport, and magnetic properties in the rare earth element doped two dimensional layer structured perovskite compounds Sr2-xRExCoO4 (RE= rare earth element). Structure refinement has revealed that these compounds crystallize in the K2NiF4-type structure with space group I4/mmm. For Pr doped samples, the lattice parameter c decreases with Pr doping levels. The Curie temperatures are found to decrease gradually from 200 K for x=0.5 to less than 100 K for x>1 for the various dopants Pr, Eu, Nd, and Sm. The resistivities were found to increase with doping levels. A large coercive field of about 1 T was found for Pr and Sm with x=0.75. A negative field hysteresis magnetoresistance in close correlation to the coercive field has been observed for Sr1.5Sm0.5CoO4, which can be explained by grain boundary spin dependent tunneling effects.