Electrical properties of high T c EuBa 2 Cu 3 0 7-X
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7. Yu Mei, S. M. Green, G. G. Reynolds, T. Wicznski, H. L. Luo, and C. Politis: Z. Phys., 1987, vol. B67, p. 303. 8. C. Jiang, Yu Mei, S. M. Green, H. L. Luo, and C. Politis: Z. Phys., 1987, vol. B68, p. 15. 9. J.C. Ho, P. H. Hor, R. L. Meng, C. W. Chu, and C. Y. Huang: Solid State Commun., 1987, vol. 63, p. 711. 10. J.O. Willis, Z. Fisk, J.D. Thompson, S.W. Cheong, R.M. Aikin, J.L. Smith, and E. Zirngiebl: J. Mag. Mag. Mater., 1987, vol. 67, p. L139. 11. B.D. Dunlap, M. Slaski, D.G. Hinks, L. Soderholm, B. Beno, K. Zhang, C. Segre, G.W. Crabtree, W.K. Kwok, S.K. Malik, I. K, Schuller, J.D. Jorgensen, and Z. Sungaila: J. Mag. Mag. Matter., 1987, vol. 68, p. L139. 12. J.H. Van Vleck: The Theory of Electric and Magnetic Susceptibilities, Oxford Univ. Press, 1965, ch. 9. 13. W.G. Penney and R. Schlapp: Phys. Rev., 1932, vol. 41, p. 194.
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Electrical Properties of High Tc EuBa2Cu3OT_x C. JIANG, YU MEI, S.M. GREEN, H.L. LUO, and C. POLITIS
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Fig. 8 - - T h e normal state susceptibility of EuBa2Cu307_x as measured in a field of 20 Oe (open circles) and after correction (solid circles). The solid lines are curves calculated according to VVF theory. The correction was made by deducting the x-values of YBazCuaO-r_, from that of EuBa2CU3OT_x. tr is the Van Vleck screening constant.
have also been reported by others. 6 Furthermore, for R = Y and Eu, no minimum was present even when a second phase was deliberately introduced. A more reasonable conjecture is to consider such minima as the precursor of the low temperature magnetic transitions reported earlier. 4'9-u
The work at UCSD is supported by the Califomia MICRO program. The authors are also indebted to Dr. R. L. Fagaly of Biomagnetic Technologies Inc. for the use of the SQUID magnetometer. REFERENCES 1. M.K. Wu, J.R. Ashburn, C.J. Torng, P.H. Hor, R.L. Meng, L. Gao, Z.J. Huang, Y.Q. Wang, and C.W. Chu: Phys. Rev. Lett., 1987, vol. 58, p. 908. 2. K.N. Yang, Y. Dalichaouch, J. M. Ferreira, B. W. Lee, J. J. Neumeier, M.S. Torkachvili, H. Zhou, M.B. Maple, and R. R. Hake: Solid State Commun., 1987, vol. 63, p. 515. 3. J.M. Tarascon, W.R. McKinnon, L.H. Greene, G.W. Hull, and E.M. Vogel: Phys. Rev., 1987, vol. B36, p. 226. 4. S.E. Brown, J. D. Thompson, J.O. Willis, R. M. Aikin, E. Zirngiebl, J. L. Smith, Z. Fisk, and R. B. Schway: Phys. Rev., 1987, vol. B36, p. 2298. 5. G. Xiao, E H. Streitz, A. Garvin, and C. L. Chien: Solid State Commun., 1987, vol. 63, p. 817. 6. E Zuo, B.R. Patton, D.L. Cox, S.I. Lee, Y. Song, J.P. Golben, X.D. Chen, S.Y. Lee, Y. Cao, Y. Lu, J.R. Gaines, J.C. Garland, and A.J. Epstein: Phys. Rev., 1987, vol. 36, p. 3603.
738--VOLUME 19A, MARCH 1988
A systematic study on the normal state resistivity of well characterized EuBazCu307_ x is presented. The oxygen content in the compound was varied by quenching from different temperatures (TQ). The resistivity is metallic when TQ
