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    National Tsing Hua University Institutional Repository > 理學院 > 物理系 > 期刊論文 >  Magnetic and calorimetric studies of anomalous Pr antiferromagnetic ordering in orthorhombic Pb2Sr2PrCu3O8

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/54310

    Title: Magnetic and calorimetric studies of anomalous Pr antiferromagnetic ordering in orthorhombic Pb2Sr2PrCu3O8
    Authors: Shieh, J.H.;Ku, H.C.;Ho, J.C.
    教師: 古煥球
    Date: 1994
    Publisher: American Physical Society
    Relation: PHYSICAL REVIEW B, American Physical Society, Volume 50, Issue 5, AUG 1 1994, Pages 3288-3293
    Keywords: strontium compounds
    specific heat of solids
    short-range order
    praseodymium compounds
    magnetic transition temperature
    magnetic structure
    magnetic anisotropy
    antiferromagnetic properties of substances
    lead compounds
    Abstract: Magnetic measurements on vacuum-annealed orthorhombic Pb2Sr2PrCu3O8+y (y≈0) reveal an anomalous Pr antiferromagnetic ordering at TN(Pr)≅6 K with transition onset up to 11 K. This Pr-2213 compound shares common structural features with the tetragonal Pr-123 compound PrBa2Cu3O6, which also undergoes a Pr ordering at 10 K. However, oxygenated pseudotetragonal Pb2Sr2PrCu3O8+y (y≈1) exhibits only low transition onset around 3 K, while orthorhombic PrBa2Cu3O7 has a higher TN(Pr) value of 17 K. Complementary studies by adiabatic calorimetry on Pb2Sr2PrCu3O8 yield a specific-heat anomaly with a peak near the magnetically derived TN(Pr), with onset around 11 K. A large heavy-fermion-like linear term in the specific heat prevails as often observed in other Pr-containing high-Tc systems. The magnetic entropy ΔSm below 11 K onset is relatively small, only 13% of R ln3 for Pr3+ with a quasitriplet ground state, implying a quasi-2D nature of the magnetic ordering with a strong 2D short-range magnetic correlation which persists to higher temperatures in this extremely anisotropic structure
    URI: http://www.aps.org/
    Appears in Collections:[物理系] 期刊論文

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