Magnetism, superconductivity, and coupling in cuprate heterostructures probed by low-energy muon-spin rotation

Wojek, Bastian M.; Morenzoni, E.; Eshchenko, D. G.; Suter, A.; Prokscha, T.; Keller, H.; Köller, E.; Fischer, Ø.; Malik, V. K.; Bernhard, C.; Döbeli, M.

doi:10.1103/physrevb.85.024505

Cited by 8 publications

(10 citation statements)

References 55 publications

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“…For instance, the proximity between different orders can be studied in multi-layer systems and superlattices. In different cuprate heterostructures a giant proximity effect has been found, [13][14][15] where low doped cuprates sandwiched between superconducting layers, can transmit supercurrent or exhibit a Meissner effect over surprisingly large distances at temperatures where these layers are intrinsically in the normal state. It is usually assumed that the magnetic layers in thin film systems behave as in the bulk material.…”

Section: Introductionmentioning

confidence: 99%

Magnetic phase diagram of low-doped La2−xSrxCuO4thi

et al. 2013

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The magnetic phase diagram of La2−xSrxCuO4 thin-films grown on single-crystal LaSrAlO4 substrates has been determined by low-energy muon-spin rotation. The diagram shows the same features as the one of bulk La2−xSrxCuO4, but the transition temperatures between distinct magnetic states are significantly different. In the antiferromagnetic phase the Néel temperature TN is strongly reduced, and no hole spin freezing is observed at low temperatures. In the disordered magnetic phase (x 0.02) the transition temperature to the cluster spin-glass state Tg is enhanced. Possible reasons for the pronounced differences between the magnetic phase diagrams of thin-film and bulk samples are discussed.arXiv:1308.0496v1 [cond-mat.mtrl-sci]

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Section: Introductionmentioning

confidence: 99%

Magnetic phase diagram of low-doped La2−xSrxCuO4thi

et al. 2013

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“…LE- µ SR is an unique and powerful technique to measure non-trivial B ( z ) on a nanometer scale in a wide variety of superconducting single crystals18, thin films1920, and heterostructures2122, allowing also the observation of non-local effects232425. Positively charged muons are slowed down and implanted into the samples at different mean implantation depths (Figs.…”

Section: Resultsmentioning

confidence: 99%

Controlling the near-surface superfluid density in underdoped YBa2Cu3O6+x by photo-illumination

Stilp

Suter

Prokscha

et al. 2014

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The interaction with light weakens the superconducting ground state in classical superconductors. The situation in cuprate superconductors is more complicated: illumination increases the charge carrier density, a photo-induced effect that persists below room temperature. Furthermore, systematic investigations in underdoped YBa2Cu3O6+x (YBCO) have shown an enhanced critical temperature Tc. Until now, studies of photo-persistent conductivity (PPC) have been limited to investigations of structural and transport properties, as well as the onset of superconductivity. Here we show how changes in the magnetic screening profile of YBCO in the Meissner state due to PPC can be determined on a nanometer scale utilizing low-energy muons. The data obtained reveal a strongly increased superfluid density within the first few tens of nanometers from the sample surface. Our findings suggest a non-trivial modification of the near-surface band structure and give direct evidence that the superfluid density of YBCO can be controlled by light illumination.

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“…Also unusual diamagnetic signals have been observed, among other an enhanced Nernst effect and unusual proximity effects, such as supercurrent transport over thick barriers at temperatures well above the T c ′ of the barrier [22,23]. By directly mapping the magnetic field profile in cuprate heterostructures, we have measured the diamagnetic (Meissner) response of cuprate barrier layers above their critical temperature, when they are brought in close contact with nearly optimally doped layers [24,25].…”

Section: Giant Proximity Effect In Cuprate Heterostructuresmentioning

confidence: 99%

Low-Energy Muons at PSI: Examples of Investigations of Superconducting Properties in Near-Surface Regions and Heterostuctures

Morenzoni¹,

Prokscha²,

Saadaoui³

et al. 2014

Proceedings of the International Symposium on Science Explored by Ultra Slow Muon (USM2013)

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With the advent of polarized low-energy muons, with tunable energy in the kiloelectronvolt range, it is possible to use the sensitivity and the local-probe character of µSR to perform depth-dependent investigations on the nanometer scale of magnetic and superconducting properties of materials. Here, after a brief summary of the present status of LE-μSR at PSI, we give some examples of investigations of superconducting properties in the near-surface regions of single crystals and thin-film materials.

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Magnetism, superconductivity, and coupling in cuprate heterostructures probed by low-energy muon-spin rotation

Cited by 8 publications

References 55 publications

Magnetic phase diagram of low-doped La2−xSrxCuO4thi

Magnetic phase diagram of low-doped La2−xSrxCuO4thi

Controlling the near-surface superfluid density in underdoped YBa2Cu3O6+x by photo-illumination

Low-Energy Muons at PSI: Examples of Investigations of Superconducting Properties in Near-Surface Regions and Heterostuctures

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