Neutron diffraction studies on Pr1+xBa2-xCu3O7-δ

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Tata Inst of Fundamental Research, Bombay, India [1 ]
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Phys B Condens Matter | / 1-4卷 / 562-564期
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Antiferromagnetism - Carrier concentration - Electrons - Magnetic moments - Magnetization - Neutron diffraction - Oxygen - Praseodymium - Praseodymium compounds - Substitution reactions;
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摘要：
PrBa2Cu3O7-δ is not superconducting and exhibits antiferromagnetic ordering of the Pr moments with TN of ≅ 17 K. In Pr1+xBa2-xCu3O7-δ, TN decreases with increasing x. In order to understand this behaviour, we have carried out powder neutron diffraction studies on various Pr1+xBa2-xCu3O7-δ samples. The structure transforms from orthorhombic for x = 0.0 and 0.2 to tetragonal for x = 0.4 and 0.6. An overall contraction in the unit cell volume and a decrease in the distance of Pr from Cu-O2 plane is observed with increasing x. The oxygen content increases with increasing x but is not sufficient to neutralize the excess electrons contributed by Pr substituting at the Ba2+ site. The decrease in TN may be due to the decrease in carrier density caused by above substitution.
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