Synthesis and magnetic properties of the R1+xSr2−xNb1−xO8−y system
作者： H. Jhans , S.K. Malik , R. Vijayaraghavan
DOI: 10.1016/0921-4534(93)90379-5
关键词:
摘要: Abstract We have carried out systematic studies involving synthesis of R1+xSr2−xCu2+xNb1−xO8−y (x = 0.0−0.2), R La, Pr, Nd, Sm, Eu, Gd, Dy and Y, investigated their magnetic properties. For the expected RSr2Cu2NbO8−y (RSCNO) phase does not form. Pr only an off-stoichiometric composition yields RSCNO single phase, Pr1.2Sr1.8Cu2.2Nb0.8O8−y (Pr1.2SCNO) Nd1.1Sr1.9Cu2.1Nb0.9O8−y (Nd1.1SCNO), respectively. In contrast, for Eu stoichiometric ratio results in monophasic material. Lattice parameters Pr1.2SCNO, Nd1.1SCNO, SmSCNO, EuSCNO, GdSCNO are found to vary linearly with rare earth ionic size. Magnetic susceptibility, χ, Pr1.2SCNO GdSCNO, exhibits a ordering sublattice. This occurs at about 6 K former 2.15 latter. The peak χ−T curve agrees well cusp (2.17 K) reported heat capacity vs. temperature data. effective paramagnetic moment, μeff, ion is deduced be 2.95μB 7.97 μB GDSCNO. result consistent that measurements which indicate entropy value corresponding Gd spin 3.3. susceptibility do transition down 1.8 Nd1.1SCNO SmSCNO compounds. μeff determined 3.42μB former. Results on abovementioned compounds discussed context related RBa2Cu2NbO8−y RBa2Cu3O7−y systems.
harvard.edu
elsevier.com
sci-hub.se 参考文章(35)
C.K. Lowe-Ma, T.A. Vanderah, In search of chemical clues: Single-crystal structural studies of PrBa2Cu3O6 and PrBa2Cu3O7 Physica C-superconductivity and Its Applications. ,vol. 201, pp. 233- 248 ,(1992) , 10.1016/0921-4534(92)90469-S
Tohru Den, Tamaki Kobayashi, Preparation and properties of YSr2Cu3−xMxOy (M = Li, Al, Ti, V, Cr, Fe, Co, Ga, Ge, Mo, WandRe) Physica C-superconductivity and Its Applications. ,vol. 196, pp. 141- 152 ,(1992) , 10.1016/0921-4534(92)90152-3
T.J. Goodwin, H.B. Radousky, R.N. Shelton, Superconducting, magnetic, electronic transport, and structural properties of (R1.5Ce0.5)Sr2Cu2NbO10, R=Pr, Nd, Sm, Eu Physica C-superconductivity and Its Applications. ,vol. 204, pp. 212- 224 ,(1992) , 10.1016/0921-4534(92)90592-Z
S. K. Malik, S. M. Pattalwar, C. V. Tomy, Ram Prasad, N. C. Soni, K. Adhikary, Magnetic-susceptibility and heat-capacity measurements on Pr-rich PrBa 2 − x Pr x Cu 3 O 7 − y compounds Physical Review B. ,vol. 46, pp. 524- 527 ,(1992) , 10.1103/PHYSREVB.46.524
H. Jhans, S.K. Malik, R. Vijayaraghavan, Magnetic properties of PrBa2Cu2MO8−y(M Ta, Nb) Solid State Communications. ,vol. 85, pp. 105- 109 ,(1993) , 10.1016/0038-1098(93)90356-R
R. Suryanarayanan, Mamidanna S.R. Rao, L. Ouhammou, N. Le Nagard, O. Gorochov, M. Gasgnier, M.O. Ruault, P. Tremblay, Possible superconductivity and microstructural investigation in Y1−xCaxSrCu2.6Fe0.4O6+z (x = 0, 0.1) Journal of Solid State Chemistry. ,vol. 95, pp. 239- 243 ,(1991) , 10.1016/0022-4596(91)90395-X
C. Greaves, P.R. Slater, Nb and Ta substitutions in YBa2Cu3O7−x and related phases: Structural characterisation of La1.1Ba1.9Cu2.1M0.9O8 (M=Nb, Ta) Physica C-superconductivity and Its Applications. ,vol. 161, pp. 245- 251 ,(1989) , 10.1016/0921-4534(89)90138-X
Q. Huang, R.J. Cava, A. Santoro, J.J. Krajewski, W.F. Peck, Neutron powder diffraction study of the crystal structure of YSr2CoCu2O7 and Y1−xCaxSr2CoCu2O7 Physica C-superconductivity and Its Applications. ,vol. 193, pp. 196- 206 ,(1992) , 10.1016/0921-4534(92)90887-I
M. Bennahmias, J. C. O’Brien, H. B. Radousky, T. J. Goodwin, P. Klavins, J. M. Link, C. A. Smith, R. N. Shelton, Magnetic, structural, and Raman characterization of RBa2Cu2NbO8(R=Pr, La, or Nd). Physical Review B. ,vol. 46, pp. 11986- 11992 ,(1992) , 10.1103/PHYSREVB.46.11986
B. D. Dunlap, M. Slaski, Z. Sungaila, D. G. Hinks, K. Zhang, C. Segre, S. K. Malik, E. E. Alp, Magnetic ordering of Gd and Cu in superconducting and nonsuperconducting GdBa2Cu3O7- delta. Physical Review B. ,vol. 37, pp. 592- 594 ,(1988) , 10.1103/PHYSREVB.37.592