A collaborative preprint paper by South China University of Technology, Central South University, and University of Electronic Science and Technology of China investigates the significant hysteresis effect in low-field microwave absorption (LFMA) in copper-substituted lead phosphate. The study shows that the effect diminishes when continuously rotating the sample under an external magnetic field but does not recover under strong magnetic fields, instead naturally restoring after two days. This indicates glassy-state characteristics, excluding the possibility of ferromagnetism. A sharp decline in LFMA intensity around 250K suggests a phase transition. The researchers employed a lattice gauge model to explain these effects, attributing them to the transition between the superconducting Meissner phase and vortex glass, along with the slow kinetics involved.
Paper URL: https://arxiv.org/abs/2312.10391