Field-induced microwave absorption in high-T c superconducting powders: Evidence for a superconducting glass phase at low T

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Abstract
Measurements of the magnetic‐field‐induced microwave absorption, P(H), in micron‐sized powders of the high‐temperature superconductor Y1Ba2Cu3O7 at several microwave frequencies for 1.3 K≤T≤Tc are reported. The hysteresis loops [P(H) vs H] observed at low temperatures (T≤16 K) indicate the presence of spontaneous circulating currents within the sample. These hysteresis loops and dc magnetization data (taken for both field‐cooled and zero‐field‐cooled states) combine to suggest that the magnetic moments of these loops are in a ‘‘spin‐glass‐like’’ state.