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Field dependence of magnetic transitions for magnetic superconductors RNi2B2C (R=Dy, Ho) : The 40th annual conference on magnetism and magnetic materials (1996)

Ku, H. C. ; Lin, M. S. ; Hsu, Y. Y. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 79 (1996), S. 5863-5865

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: High field (up to 5 T) magnetization measurements were performed on both bulk and field-aligned powder samples of RNi2B2C (R=Dy, Ho) magnetic superconductors. For Tc=3.8 K, a DyNi2B2C superconductor with antiferromagnetic Néel temperature TN of 10–11 K, and anomalous field-induced weak-ferromagnetic transitions were observed above the superconducting upper critical field Hc2(2 K) of 1.75 kG. The aligned powders show distinct hysteresis characteristics for both fields applied parallel and perpendicular to the tetragonal basal plane. For Tc=7.8 K, HoNi2B2C has an incommensurate magnetic ordering temperature Tm of 6 K and TN of 5.2 K. Anomalous field-induced weak-ferromagnetic transitions were also observed below TN. No hysteresis can be detected for TN〈T〈Tm. © 1996 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.362152

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Digitale Medien

Systematic variation of TN(Pr) for the two-CuO2-layer cuprate m212 (m=1, 2, 3) systems : The 40th annual conference on magnetism and magnetic materials (1996)

Ku, H. C. ; Yang, C. L. ; Chou, C. H. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 79 (1996), S. 5866-5868

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The systematic variation of anomalous Pr antiferromagnetic ordering temperature TN(Pr) for the two-CuO2-layer cuprate system MA2PrCu2Oy (M=Cu, Hg, Tl, Pb; A=Ba, Sr) was verified through the observation of a new Hg-1212 HgSr2PrCu2O6+δ tetragonal compound with a TN(Pr) of 6 K and a Pr—O bond length of 2.492 A(ring) between Pr and oxygen in the adjacent CuO2 layers. For the tetragonal/orthorhombic 1212 compounds including the PrBa2Cu3O7−y system, TN(Pr) was found to decrease monotonically with increasing Pr—O distance. The importance of Pr-O-Pr superexchange magnetic coupling is expected for all two-CuO2-layer MmA2PrCu2Oy m212-type (m=1, 2, 3) compounds. A similar Pr anomaly in the 2212-type system was first observed on the new tetragonal (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2PrCu2O8 compound with a high TN(Pr) of 9 K. © 1996 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.362153

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Magnetic and transport properties of PrBa2Cu4O8-δ prepared at 1 atm oxygen pressure (1996)

Ku, H. C. ; You, Y. B. ; Sheen, S. R. ; [weitere]

Springer

Journal of low temperature physics 105 (1996), S. 1463-1468

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ISSN: 1573-7357

Schlagwort(e): 74.10,+v ; 74.25.Bt, Ha ; 74.72.−h ; 74.72.Jt

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Measurements of physical properties were performed on the PrBa2Cu4O8-δ sample prepared by the sol-gel method and sintered in I atm oxygen pressure. Instead of exhibiting superconductivity as for R Y or Gd in the RBa2Cu4O8-δ compound. This compound is unstable, insulating but metallic-like at low temperatures. No superconductivity was observed down to 2 K. Since PrBa2Cu4O8-δ can be re-written as Cu2Ba2PrCu2O8-δ which is a compound of two CuO2-layers and two CuO-chains, the possibility of anomalous Pr antiferromagnetic ordering around 18 K observed from preliminary magnetic data and the effect of oxygen stoichiotmetry parameter δ on the metal-insulator transition are explored.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00753906

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