Applied Magnetic Resonance

, Volume 8, Issue 1, pp 45–55 | Cite as

Low-field microwave magnetoabsorption in the cuprate superconductors

  • S. M. Bhagat


We review results on the low-field microwave magnetoabsorption (LFMMA) in granular samples of YBCO and BSCCO. First, we show that the virgin response (increase in absorption on first application ofH) obeys a universal form (ΔP/α)=(1+H 0/H)−1. Interpreting this in conjunction with de magnetization isotherms on the same samples, we demonstrate that the data support a model in which the LFMMA arises from field dependent reduction in the critical currents of the weak links in the sample surface. Next, we present examples of the variety of hysteresis loops obtained on subsequent field cycling and interpret them in terms of the universal form provided thatH is replaced by an effective valueH eff. Attempts are made to delineate the various terms appearing inH eff.


Critical Current Josephson Junction Microwave Absorption Cuprate Superconductor Universal Form 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    Portis A.M., Blazey K.W., Muller K.A., Bednorz J.G.: Europhys. Lett.5, 467 (1988)CrossRefADSGoogle Scholar
  2. [2]
    Ji L., Rzchowski M.S., Anand A., Tinkham M.: Phys. Rev. B47, 470 (1993)CrossRefADSGoogle Scholar
  3. [3]
    Silva E., Giura M., Marcon R., Fastampa R., Balestrino G., Marinelli M., Milani E.: Phys. Rev. B45, 12566 (1992)CrossRefADSGoogle Scholar
  4. [4]
    Dulcic A., Rakvin B., Pozek M.: Europhys. Lett.10, 4437 (1989)CrossRefGoogle Scholar
  5. [5]
    Ramachandran J.S., Huang M.X., Bhagat S.M., Kish K., Tyagi S.: Physica C202, 151 (1992); see also Mahel M., Darula M., Benacka S.: Supercond. Sci. Tech.6, 312 (1993)CrossRefADSGoogle Scholar
  6. [6]
    Huang M.X., Bhagat S.M., Finlikoglu A.T., Venkatesan T., Manheimer M.A., Tyagi S.: Physica C193, 421 (1992)CrossRefADSGoogle Scholar
  7. [7]
    Jackson E.M., Liao S.B., Silvis J., Swihart A.H., Bhagat S.M., Grittenden R., Glover R.E. III: Physica C152, 125 (1988)CrossRefADSGoogle Scholar
  8. [8]
    Ramachandran J.S., Huang M.X., Bhagat S.M.: Physica C234, 173 (1994)CrossRefADSGoogle Scholar
  9. [9]
    Seshu Bai V., Patanjali P.V., Bhagat S.M., Tyagi S.: J. of Superconductivity (in press)Google Scholar

Copyright information

© Springer 1995

Authors and Affiliations

  • S. M. Bhagat
    • 1
  1. 1.Department of Physics and Center for Superconductivity ResearchUniversity of MarylandCollege ParkUSA

Personalised recommendations