Magnetic Fluctuations in Pair-Density-Wave Superconductors

Distinct Nature of Static and Dynamic Magnetic Stripes in Cuprate Superconductors

“…Absence of a spin gap was also observed in the experiments on strongly underdoped LSCO [24] and LBCO [25], mentioned above. Both materials were suggested not to be d-wave superconductors but instead display Pair Density Wave (PDW) superconductivity [4,29]. Our results are consistent with this interpretation.…”

Nature of the magnetic stripes in fully oxygenated La2CuO4+y

“…In underdoped LBCO, a lack of spin gap has also been observed and interpreted as evidence of a PDW type of electronic structure with intertwined modulated superconducting order and spin stripes [45,80]. In our sample, we interpret the absence of any significant decrease in χ for T < T c at energieshω 10 meV, as an indication that superconductivity in LCOO microscopically coexists with the low-energy magnetic fluctuations.…”

“…To further elucidate the nature of the superconducting state, it would be interesting to investigate the presence or absence of a magnetic resonance peak by inelastic neutron measurements of high energy spin excitations. One of the fingerprints of the PDW is the absence of the magnetic resonance peak [45,80] otherwise observed, in standard d-wave SC, at E cross ≈ 40-50 meV [8,47,81].…”

Thermodynamic anomaly above the superconducting critical temperature in the quasi-one-dimensional superconductorTa4Pd3Te16

“…For example, both cuprate and iron-pnictide superconductors are proximal to magnetic and possibly "nematic" orders. In the case of the cuprates, the recent discovery of charge density order has ignited debate as to whether such thermodynamic phases are competing, causal, or benignly coincident with superconductivity [1][2][3]. This ground-state electronic competition is particularly important in quasi-one dimensional (q1D) systems [4,5], which generically show charge order and often also exhibit unconventional superconductivity.…”