Paramagnetic magnetization signals and curious metastable behaviour in field-cooled magnetization of a single crystal of superconductor 2H-NbSe<sub>2</sub>

Kumar, Santosh; Tomy, C. V.; Paul, D. McK.; Grover, A. K.

doi:10.1088/0953-8984/27/29/295701

Cited by 3 publications

(2 citation statements)

References 51 publications

(169 reference statements)

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“…The mean value of the induction is greater than the applied field and, therefore, total magnetic moment will be positive, -phenomenon known as the "paramagnetic" Meissner effect (PME). [23,[25][26][27] This is directly seen in our Fig. 1 (b).…”

Section: Single Crystal Nbsupporting

confidence: 74%

Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry

et al. 2018

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Non-invasive magnetic field sensing using optically -detected magnetic resonance of nitrogenvacancy (NV) centers in diamond was used to study spatial distribution of the magnetic induction upon penetration and expulsion of weak magnetic fields in several representative superconductors. Vector magnetic fields were measured on the surface of conventional, Pb and Nb, and unconventional, LuNi2B2C, Ba0.6K0.4Fe2As2, Ba(Fe0.93Co0.07)2As2, and CaKFe4As4, superconductors, with diffraction -limited spatial resolution using variable -temperature confocal system. Magnetic induction profiles across the crystal edges were measured in zero-field-cooled (ZFC) and field-cooled (FC) conditions. While all superconductors show nearly perfect screening of magnetic fields applied after cooling to temperatures well below the superconducting transition, Tc, a range of very different behaviors was observed for Meissner expulsion upon cooling in static magnetic field from above Tc. Substantial conventional Meissner expulsion is found in LuNi2B2C, paramagnetic Meissner effect (PME) is found in Nb, and virtually no expulsion is observed in iron-based superconductors. In all cases, good correlation with macroscopic measurements of total magnetic moment is found. Our measurements of the spatial distribution of magnetic induction provide insight into microscopic physics of the Meissner effect.

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Section: Single Crystal Nbsupporting

confidence: 74%

Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry

et al. 2018

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“…Since then, the PME was observed in a variety of metallic superconductors [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48], and in different forms such as thin films [49][50][51][52], nanowire arrays [53], multilayer systems [54][55][56][57][58][59], and very importantly, in nanocomposites [60,61] and mesoscopic structured samples [62][63][64][65][66]. Multilayered materials may be composed of superconductor/normal metal, but also superconducting/para-or ferromagnetic ones.…”

Section: Introductionmentioning

confidence: 99%

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

Koblischka

Půst

Chang

et al. 2023

Metals

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The experimental data in the literature concerning the Paramagnetic Meissner Effect (PME) or also called Wohlleben effect are reviewed with the emphasis on the PME exhibited by metallic, s-wave superconductors. The PME was observed in field-cool cooling (FC-C) and field-cool warming (FC-W) m(T)-measurements on Al, Nb, Pb, Ta, in compounds such as, e.g., NbSe2, In-Sn, ZrB12, and others, and also in MgB2, the metallic superconductor with the highest transition temperature. Furthermore, samples with different shapes such as crystals, polycrystals, thin films, bi- and multilayers, nanocomposites, nanowires, mesoscopic objects, and porous materials exhibited the PME. The characteristic features of the PME, found mainly in Nb disks, such as the characteristic temperatures T1 and Tp and the apparative details of the various magnetic measurement techniques applied to observe the PME, are discussed. We also show that PME can be observed with the magnetic field applied parallel and perpendicular to the sample surface, that PME can be removed by abrading the sample surface, and that PME can be introduced or enhanced by irradiation processes. The PME can be observed as well in magnetization loops (MHLs, m(H)) in a narrow temperature window Tp<Tc, which enables the construction of a phase diagram for a superconducting sample exhibiting the PME. We found that the Nb disks still exhibit the PME after more than 20 years, and we present the efforts of magnetic imaging techniques (scanning SQUID microscopy, magneto-optics, diamond nitrogen-vacancy (NV)-center magnetometry, and low-energy muon spin spectroscopy, (LE-μSR)). Various attempts to explain PME behavior are discussed in detail. In particular, magnetic measurements of mesoscopic Al disks brought out important details employing the models of a giant vortex state and flux compression. Thus, we consider these approaches and demagnetization effects as the base to understand the formation of the paramagnetic signals in most of the materials investigated. New developments and novel directions for further experimental and theoretical analysis are also outlined.

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Paramagnetic response and novel metastability effects in a single crystal of superconducting Ca3Ir4Sn13

Kumar¹,

Singh²,

Thamizhavel³

et al. 2016

AIP Conference Proceedings

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Paramagnetic magnetization signals and curious metastable behaviour in field-cooled magnetization of a single crystal of superconductor 2H-NbSe₂

Cited by 3 publications

References 51 publications

Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry

Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

Paramagnetic response and novel metastability effects in a single crystal of superconducting Ca3Ir4Sn13

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Paramagnetic magnetization signals and curious metastable behaviour in field-cooled magnetization of a single crystal of superconductor 2H-NbSe2

Cited by 3 publications

References 51 publications

Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry

Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

Paramagnetic response and novel metastability effects in a single crystal of superconducting Ca3Ir4Sn13

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Paramagnetic magnetization signals and curious metastable behaviour in field-cooled magnetization of a single crystal of superconductor 2H-NbSe₂