High-field muSR studies of superconducting and magnetic correlations in cuprates above Tc

Abstract

The advent of high transverse-field muon spin rotation (TF-muSR) has led to recent muSR investigations of the magnetic-field response of cuprates above the superconducting transition temperature T_c. Here the results of such experiments on hole-doped cuprates are reviewed. Although these investigations are currently ongoing, it is clear that the effects of high field on the internal magnetic field distribution of these materials is dependent upon a competition between superconductivity and magnetism. In La_{2-x}Sr_xCuO_4 the response to the external field above Tc is dominated by heterogeneous spin magnetism. However, the magnetism that dominates the observed inhomogeneous line broadening below x ~ 0.19 is overwhelmed by the emergence of a completely different kind of magnetism in the heavily overdoped regime. The origin of the magnetism above x ~ 0.19 is currently unknown, but its presence hints at a competition between superconductivity and magnetism that is reminiscent of the underdoped regime. In contrast, the width of the internal field distribution of underdoped YBa_2Cu_3O_y above Tc is observed to track Tc and the density of superconducting carriers. This observation suggests that the magnetic response above Tc is not dominated by electronic moments, but rather inhomogeneous fluctuating superconductivity.

28 pages, 11 figures, 104 references

References in corpus (31)

• Quantum oscillations and the Fermi surface in an underdoped high-Tc superconductor
• Broken rotational symmetry in the pseudogap phase of a high-Tc superconductor
• Electronic liquid crystal state in the high-temperature superconductor YBCO(6.45)
• Defects in correlated metals and superconductors
• Visualizing pair formation on the atomic scale in the high-Tc superconductor Bi2Sr2CaCu2O8+d
• Quantum Oscillations in the Underdoped Cuprate YBa2Cu4O8
• The Nernst effect and the boundaries of the Fermi liquid picture
• Tuning competing orders in La2-xSrxCuO4 cuprate superconductors by the application of an external magnetic field
• Enhancement of the Nernst effect by stripe order in a high-Tc superconductor
• Evidence for pairing above Tc from the dispersion in the pseudogap phase of cuprates
• Observation of the Nernst signal generated by fluctuating Cooper pairs
• Disappearance of antiferromagnetic spin excitations in over-doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• Magnetic-field-enhanced incommensurate magnetic order in the underdoped high-temperature superconductor YBa(2)Cu(3)O(6.45)
• Inhomogeneous superconductivity and the "pseudogap state of novel superconductors
• Competition between spin density wave order and superconductivity in the underdoped cuprates
• Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors
• Weak coupling d-wave BCS superconductivity and unpaired electrons in overdoped La_{2-x}Sr_{x}CuO_{4} single crystals
• Direct observation of the flux-line vortex glass phase in a type II superconductor
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• Direct Search for a Ferromagnetic Phase in a Heavily Overdoped Nonsuperconducting Copper Oxide
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Cited by in corpus (3)

• Direct Search for a Ferromagnetic Phase in a Heavily Overdoped Nonsuperconducting Copper Oxide
• Universal Disorder in Bi2Sr2CaCu2O8+x
• Curie-like paramagnetism due to incomplete Zhang-Rice singlet formation in La2-xSrxCuO4