High-pressure synthesis, crystal structure and magnetic properties of a new cuprate (Nd,Ce)2+xCaCu2O6+y |
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Authors: | ND Zhigadlo |
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Institution: | National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibraki 305-0044, Japan |
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Abstract: | New phase (Nd,Ce)2+xCaCu2O6+y was prepared at a high-pressure/high-temperature condition of 6 GPa and 1300°C. It had a nonstoichiometric composition close to Nd2.16Ce0.225CaCu2O6+y. According to X-ray diffraction pattern, the Nd2.16Ce0.225CaCu2O6+y phase has a tetragonal lattice with a = 3.845(1) Å, c = 19.349(5) Å. However, electron microscopic observations revealed a complicated shear structure for this phase. Magnetic susceptibility and magnetic hysteresis measurements were performed for the Nd2.16Ce0.225CaCu2O6+y sample and it was found that the phase undergoes a weak ferromagnetic transition at 150 K. Below ≈40 K, complicated magnetic behavior was observed suggesting the presence of second weak ferromagnetic transition near 40 K. |
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Keywords: | High-pressure synthesis (Nd Ce)2+xCaCu2O6+y HRTEM Weak ferromagnetic transition |
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