Magnetic Aging in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>Bi</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi>Sr</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi>CaCu</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi>O</mi></mrow><mrow><mn>8</mn></mrow></msub></mrow></math></span> Displaying the Paramagnetic Meissner Effect

E. L. Papadopoulou; P. Nordblad; P. Svedlindh; R. Schöneberger; R. Gross

doi:10.1103/PhysRevLett.82.173

Magnetic Aging in ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8}$ Displaying the Paramagnetic Meissner Effect

E. L. Papadopoulou, P. Nordblad, P. Svedlindh, R. Schöneberger, and R. Gross

Phys. Rev. Lett. 82, 173 – Published 4 January 1999

Abstract

Magnetic relaxation measurements have been performed on a bulk, melt-cast sample of ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8}$ , displaying the paramagnetic Meissner effect (PME), revealing zero external field magnetic aging in a superconducting system. The aging effect, being a cooperative phenomenon, points out that the spontaneous orbital currents existing in PME samples behave collectively. The results can be understood by modeling of the polydomain microstructure of the superconducting grains as Josephson junction networks with randomly distributed $π$ junctions.