Paramagnetic Meissner Effect Observed in SrBi3 with κ Close to the Critical Regime

Zhang, Luo-Zhao; Zhang, An-Lei; Lü, Weijia; Xiao, Qi-Ling; Chen, Fei; Feng, Zhenjie; Cao, Shixun; Zhang, Jincang; Ge, Jun‐Yi

doi:10.1007/s10948-019-05389-x

Cited by 3 publications

(6 citation statements)

References 36 publications

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“…Analogous bumps in the M – T curves were also observed, and they were assigned to the Cr vacancies in the bulk Cr 5 Te 6 . [ 55 ] The peak of the bump separates the regions P 1 (mixed ferromagnetic and antiferromagnetic phases) and P 2 (ferromagnetic phase) in the M – T curve. Based on the scaling law M ≈ ( T C − T ) β , [ 28 ] the data near T C are fitted, where T C and the critical exponent β are calculated to be 320 K and 0.476, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The layers of Cr 1 and Cr 2 are stacked alternately along the c axis. [55] Figure 1a substrates after growth. The distinct 3D dotted matrix patterns suggest that the crystallization of Cr 5 Te 6 films is 3D island-like growth.…”

Section: Resultsmentioning

confidence: 99%

“…The layers of Cr 1 and Cr 2 are stacked alternately along the c axis. [ 55 ] Figure 1a also shows the reflection high‐energy electron diffraction (RHEED) patterns of the Cr 5 Te 6 films on Al 2 O 3 (001) substrates after growth. The distinct 3D dotted matrix patterns suggest that the crystallization of Cr 5 Te 6 films is 3D island‐like growth.…”

Section: Resultsmentioning

confidence: 99%

“…[ 56 ] In addition to the Al 2 O 3 substrate, the x‐ray diffraction (XRD) patterns exhibit diffraction peaks of the (002 n ) family of planes (see Figure S1b, Supporting Information), indicating the surface perpendicular to the c axis of Cr 5 Te 6 . [ 55 ] The atomic force microscope (AFM) image is also provided (Figure S1c, Supporting Information), indicating the relatively flat surface of the Cr 5 Te 6 films. To evaluate the crystal structure, cross sectional high‐angle annular dark field‐scanning transmission electron microscopy (HAADF‐STEM) is performed on the Cr 5 Te 6 (20 nm) film with the 2D integrated differential phase contrast (iDPC) technique.…”

Section: Resultsmentioning

confidence: 99%

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Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr₅Te₆ Thin Films

Chen

Zhu

Lin

et al. 2023

Adv Funct Materials

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The topological Hall effect (THE) is critical to the exploration of the spin chirality generated by the real‐space Berry curvature, which has attracted worldwide attention for its prospective applications in spintronic devices. However, the prominent THE remains elusive at room temperature, which severely restricts the practical integration of chiral spin textures. Here, a colossal intrinsic THE is showed up to ≈1.6 µΩ cm in large‐area ferromagnet Cr5Te6 thin films epitaxially grown by pulsed laser deposition. Such a THE can be maintained until 270 K, which is attributed to the field‐stimulated noncoplanar spin textures induced by the interaction of the in‐plane ferromagnet and antiferromagnet infrastructures. The first‐principles calculations further verify the considerable Dzyaloshinskii‐Moriya interaction in Cr5Te6. This work not only paves the way for robust chiral spin textures near room temperature in large‐area low‐dimensional ferromagnetic films for practical applications, but also facilitates the development of high‐density and dissipationless spintronic devices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr₅Te₆ Thin Films

Chen

Zhu

Lin

et al. 2023

Adv Funct Materials

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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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Thermal annealing of superconducting niobium titanium nitride thin films deposited by plasma-enhanced atomic layer deposition

Díaz-Palacio

Wenskat

Deyu

et al. 2023

Journal of Applied Physics

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Next-generation superconducting radio frequency (SRF) cavities, based on tailored thin films, would allow for more efficient and sustainable accelerators operating at higher accelerating gradients. In particular, superconductor–insulator–superconductor (SIS) multilayers are proposed as a potential alternative to bulk Nb. In this context, NbTiN stands out as a superconducting candidate. Here, we report our studies on NbTiN thin films grown by plasma-enhanced atomic layer deposition (PEALD) in a supercycle approach on AlN in situ deposited on planar silicon substrates. In detail, different ternary compound compositions and thicknesses have been investigated concerning the elemental composition, the superconducting properties, and the crystallinity of the deposited thin films. Two different post-deposition thermal treatments have been applied to Nb0.75Ti0.25N thin films of different thicknesses. Their effect on the film properties has been evaluated. It has been demonstrated that an optimized post-deposition thermal annealing procedure significantly improves the quality of our PEALD deposited Nb0.75Ti0.25N thin films, achieving the highest superconducting critical temperature (Tc) of 15.9 K obtained for films deposited by atomic layer deposition (ALD) so far and a lower critical field (Hc1) of 213 mT, which overpasses the bulk Nb intrinsic limit of 200 mT. Our studies are a promising first stepping stone on the path toward tailored thin films based SRF cavities.

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Paramagnetic Meissner Effect Observed in SrBi3 with κ Close to the Critical Regime

Cited by 3 publications

References 36 publications

Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr₅Te₆ Thin Films

Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr₅Te₆ Thin Films

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

Thermal annealing of superconducting niobium titanium nitride thin films deposited by plasma-enhanced atomic layer deposition

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Paramagnetic Meissner Effect Observed in SrBi3 with κ Close to the Critical Regime

Cited by 3 publications

References 36 publications

Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr5Te6 Thin Films

Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr5Te6 Thin Films

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

Thermal annealing of superconducting niobium titanium nitride thin films deposited by plasma-enhanced atomic layer deposition

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Product

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Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr₅Te₆ Thin Films

Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr₅Te₆ Thin Films