Vortex Motion in Superconducting YBa2Cu3O7-δ Inferred from the Damping of the Oscillations of a Levitating Magnetic Microsphere

Journal of Low Temperature Physics

Volumn 119, Issue 5-6, 2000, Pages 723-742

  Grosser, R ^a   Hocherl P ^a   Martin, A ^a   Niemetz, M ^a   Schoepe, W ^a  

^a UNIVERSITY OF REGENSBURG   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

DAMPING; ELECTRIC FIELDS; GRANULAR MATERIALS; LOW TEMPERATURE EFFECTS; MAGNETIC FLUX; MAGNETIC HYSTERESIS; OSCILLATIONS; PERMANENT MAGNETS; THIN FILMS; VORTEX FLOW;

ENERGY BARRIER; OSCILLATING SHIELDING CURRENTS;

YTTRIUM BARIUM COPPER OXIDES;

EID: 0042727328     PISSN: 00222291     EISSN: None     Source Type: Journal    
DOI: 10.1023/a:1004693931755     Document Type: Article

References (25)

1. F. C. Moon, Superconducting Levitation, John Wiley & Sons, New York (1994).
2. R. Grosser, J. Jäger, J. Betz, and W. Schoepe, Appl. Phys. Lett. 67, 2400 (1995).
3. R. Grosser, A. Martin, M. Niemetz, E. V. Pechen, and W. Schoepe, cond-mat/9712199.
4. H. Barowski, K. M. Sattler, and W. Schoepe, J. Low Temp. Phys. 93, 85 (1993).
5. J. Jäger, B. Schuderer, and W. Schoepe, Phys. Rev. Lett. 74, 566 (1995) and Physica B 210, 201 (1995).
6. J. Jäger, B. Schuderer, and W. Schoepe, Phys. Rev. Lett. 74, 566 (1995) and Physica B 210, 201 (1995).
7. H. J. Bornemann, C. Urban, P. Boegler, H. Küpfer, H. Rietschel, Advances in Superconductivity VI, T. Fujita and Y. Shiohara (eds.), Springer-Verlag, Tokyo (1994), Vol 2, p. 1311.
8. E. V. Pechen, A. V. Varlashkin, S. I. Krasnosvobodtsev, B. Brunner, and K. F. Renk, Appl. Phys. Lett. 66, 2292 (1995).
9. 0 = (0.4±0.1) mm.
10. S. B. Haley and H. J. Fink, Phys. Rev. B 53, 3506 (1996).
11. -2.
12. The Q-factor is still low enough to neglect dissipation by the input impedance of the electrometer or by residual gas (the cell was evacuated and contained charcoal for cryopumping). Eddy current losses in normal conducting metal parts of the measuring cell are difficult to estimate but appear to be too small to limit the Q value at 4 K.
13. s are uncertain to within a factor 2 to 4.
14. N. Belk, D. E. Oates, D. A. Feld, G. Dresselhaus, M. S. Dresselhaus, Phys. Rev. B 53, 3459 (1996); J. R. Powell, A. Porch, R. G. Humphreys, F. Wellhöfer, M. J. Lancaster, and C. E. Gough, Phys. Rev. B 57, 5474 (1998).
15. N. Belk, D. E. Oates, D. A. Feld, G. Dresselhaus, M. S. Dresselhaus, Phys. Rev. B 53, 3459 (1996); J. R. Powell, A. Porch, R. G. Humphreys, F. Wellhöfer, M. J. Lancaster, and C. E. Gough, Phys. Rev. B 57, 5474 (1998).
16. M. W. Coffey and J. R. Clem, Phys. Rev. B 45, 10527 (1992).
17. M. Golosovsky, M. Tsindlekht, and D. Davidov, Supercond. Sci. Technol. 9, 1 (1996).
18. N. Lütke-Entrup, B. Plaçais, P. Mathieu, and Y. Simon, Phys. Rev. Lett. 79, 2538 (1997); Physica B, to be published.
19. N. Lütke-Entrup, B. Plaçais, P. Mathieu, and Y. Simon, Phys. Rev. Lett. 79, 2538 (1997); Physica B, to be published.
20. G. Blatter, M. V. Feigelman, V. B. Geshkenbein, A. I. Larkin, and V. M. Vinokur, Rev. Mod. Phys. 66, 1125 (1994); E. H. Brandt, Rep. Prog. Phys. 58, 1465 (1995).
21. G. Blatter, M. V. Feigelman, V. B. Geshkenbein, A. I. Larkin, and V. M. Vinokur, Rev. Mod. Phys. 66, 1125 (1994); E. H. Brandt, Rep. Prog. Phys. 58, 1465 (1995).
22. Satisfactory fits could also be obtained using Eq. (7) with values of μ up to 0.6. This, however, leads to barriers comparable to kT for our measuring currents, which appears unreasonable.
23. P. H. Melville, J. Phys. C: Solid St. Phys. 4, 2833 (1971).
24. A. H. Nayfeh and D. T. Mook, Nonlinear Oscillations, John Wiley & Sons, New York (1979), Chap. 4.
25. J. C. Wei, J. L. Chen, L. Horng, and T. J. Yang, Phys. Rev. B 54, 15429 (1996).