Internal magnetic fields in the high-temperature superconductor YBa2Cu3O7−δ from muon spin rotation experiments

Pümpin, B.; Keller, H.; Kündig, W.; Odermatt, W.; Pàtterson, B. D.; Schneider, J. W.; Simmler, H.; Connell, S. H.; Müller, K. A.; Bednorz, J. G.; Blazey, K. W.; Morgenstern, Ingo; Rossel, C.; Savić, I. M.

doi:10.1007/bf01312133

Cited by 31 publications

(7 citation statements)

References 15 publications

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“… 355 − 357 Moreover, the μSR technique has a time window for the study of magnetic fluctuations in materials, which is complementary to other experimental techniques such as neutron scattering, NMR or magnetic susceptibility. In addition to magnetism, this technique allows to study interesting problems related to superconductivity, 358 − 370 chemical kinetics, diffusion, molecular dynamics, and semiconductor physics. One can also probe magnetic and superconducting properties at the surface of a superconductor using ultralow energy muons.…”

Section: Probing the Magnetic Properties Of Layered Materials ...mentioning

confidence: 99%

The Magnetic Genome of Two-Dimensional van der Waals Materials

et al. 2022

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Magnetism in two-dimensional (2D) van der Waals (vdW) materials has recently emerged as one of the most promising areas in condensed matter research, with many exciting emerging properties and significant potential for applications ranging from topological magnonics to low-power spintronics, quantum computing, and optical communications. In the brief time after their discovery, 2D magnets have blossomed into a rich area for investigation, where fundamental concepts in magnetism are challenged by the behavior of spins that can develop at the single layer limit. However, much effort is still needed in multiple fronts before 2D magnets can be routinely used for practical implementations. In this comprehensive review, prominent authors with expertise in complementary fields of 2D magnetism ( i.e. , synthesis, device engineering, magneto-optics, imaging, transport, mechanics, spin excitations, and theory and simulations) have joined together to provide a genome of current knowledge and a guideline for future developments in 2D magnetic materials research.

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Section: Probing the Magnetic Properties Of Layered Materials ...mentioning

confidence: 99%

The Magnetic Genome of Two-Dimensional van der Waals Materials

et al. 2022

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“…The 3D flux distribution inside the superconductor also can be probed by neutron depolarization (Weber 1974, Roest andRekveldt 1993). A further method which probes the field distribution of the FLL in the bulk is muon spin rotation (µSR) (Brandt and Seeger 1986, Pümpin et al 1988, Herlach et al 1990, Harshman et al 1989, Brandt 1988a,b, 1991c, Lee et al 1993, Cubitt et al 1993a, Weber et al 1993, Sonier et al 1994, Alves et al 1994, Song 1995, Riseman et al 1995, see also section 5.7.…”

Section: Observation Of the Flux-line Latticementioning

confidence: 99%

“…. denotes spatial averaging) of a perfect FLL exhibits van Hove singularities (Seeger 1979, Brandt andSeeger 1986), which will be smeared by the random distortions of the FLL caused by pinning (Pümpin et al 1988, Brandt 1988a,b, 1991c, Herlach et al 1990, Harshman et al 1991, Weber et al 1993, Riseman et al 1995 or by thermal fluctuation (Song et al 1993, Song 1995 or flux diffusion (Inui and Harshman 1993). By µSR Cubitt et al (1993a) measure the angular dependence of the field distribution in BSCCO and find evidence for the presence of weakly coupled point vortices.…”

Section: First-order Melting Transitionmentioning

confidence: 99%

The flux-line lattice in superconductors

1995

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Magnetic flux can penetrate a type-II superconductor in form of Abrikosov vortices (also called flux lines, flux tubes, or fluxons) each carrying a quantum of magnetic flux φ 0 = h/2e. These tiny vortices of supercurrent tend to arrange in a triangular flux-line lattice (FLL) which is more or less perturbed by material inhomogeneities that pin the flux lines, and in high-T c superconductors (HTSC's) also by thermal fluctuations. Many properties of the FLL are well described by the phenomenological Ginzburg-Landau theory or by the electromagnetic London theory, which treats the vortex core as a singularity. In Nb alloys and HTSC's the FLL is very soft mainly because of the large magnetic penetration depth λ: The shear modulus of the FLL is c 66 ∼ 1/λ 2 , and the tilt modulus c 44 (k) ∼ (1 + k 2 λ 2 ) −1 is dispersive and becomes very small for short distortion wavelength 2π/k ≪ λ. This softness is enhanced further by the pronounced anisotropy and layered structure of HTSC's, which strongly increases the penetration depth for currents along the c-axis of these (nearly uniaxial) crystals and may even cause a decoupling of two-dimensional vortex lattices in the Cu-O layers. Thermal fluctuations and softening may "melt" the FLL and cause thermally activated depinning of the flux lines or of the two-dimensional "pancake vortices" in the layers. Various phase transitions are predicted for the FLL in layered HTSC's. Although large pinning forces and high critical currents have been achieved, the small depinning energy so far prevents the application of HTSC's as conductors at high temperatures except in cases when the applied current and the surrounding magnetic field are small.

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“…It is noteworthy that Prof. K. Alex Müller realised the importance and the strength of the µSR technique in the studies of high temperature superconductors (HTSs) at the very early stage of the era of high-T c cuprates, as demonstrated in the pioneering papers [18][19][20]. Indeed, this technique allows us to study fundamental problems related to superconductivity [8,[21][22][23][24][25][26][27][28][29].…”

Section: µSr Technique: Very Sensitive Microscopic Magnetic Probementioning

confidence: 99%

Unconventional Magnetism in Layered Transition Metal Dichalcogenides

Guguchia

2020

Condensed Matter

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In this contribution to the MDPI Condensed Matter issue in Honor of Nobel Laureate Professor K.A. Müller I review recent experimental progress on magnetism of semiconducting transition metal dichalcogenides (TMDs) from the local-magnetic probe point of view such as muon-spin rotation and discuss prospects for the creation of unique new device concepts with these materials. TMDs are the prominent class of layered materials, that exhibit a vast range of interesting properties including unconventional semiconducting, optical, and transport behavior originating from valley splitting. Until recently, this family has been missing one crucial member: magnetic semiconductor. The situation has changed over the past few years with the discovery of layered semiconducting magnetic crystals, for example CrI 3 and VI 2 . We have also very recently discovered unconventional magnetism in semiconducting Mo-based TMD systems 2H-MoTe 2 and 2H-MoSe 2 [Guguchia et. al., Science Advances 2018, 4(12)]. Moreover, we also show the evidence for the involvement of magnetism in semiconducting tungsten diselenide 2H-WSe 2 . These results open a path to studying the interplay of 2D physics, semiconducting properties and magnetism in TMDs. It also opens up a host of new opportunities to obtain tunable magnetic semiconductors, forming the basis for spintronics.

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Internal magnetic fields in the high-temperature superconductor YBa2Cu3O7−δ from muon spin rotation experiments

Cited by 31 publications

References 15 publications

The Magnetic Genome of Two-Dimensional van der Waals Materials

The Magnetic Genome of Two-Dimensional van der Waals Materials

The flux-line lattice in superconductors

Unconventional Magnetism in Layered Transition Metal Dichalcogenides

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