Discovery of slow magnetic fluctuations and critical slowing down in the pseudogap phase of YBa₂Cu₃O_y

2017/03/20 by Zhang, Jian, Ding, Z. F., Tan, C. +11
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.1703.06799

Abstract

Evidence for intra-unit-cell (IUC) magnetic order in the pseudogap region of high-T_c cuprates below a temperature T^∗ is found in several studies, but NMR and μSR experiments do not observe the expected static local magnetic fields. It has been noted, however, that such fields could be averaged by fluctuations. Our measurements of muon spin relaxation rates in single crystals of YBa₂Cu₃O_y reveal magnetic fluctuations of the expected order of magnitude that exhibit critical slowing down at T^∗. These results are strong evidence for fluctuating IUC magnetic order in the pseudogap phase.

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