Electronic Structures and Surface Reconstructions in Magnetic Superconductor RbEuFe<sub>4</sub>As<sub>4</sub>

Stolyarov, V. S.; Pervakov, K. S.; Астраханцева, А. С.; Golovchanskiy, I. A.; Vyalikh, D. V.; Kim, T. K.; Eremeev, S. V.; Власенко, В. А.; Pudalov, V. M.; Golubov, A. A.; Chulkov, Eugene V.; Roditchev, Dimitri

doi:10.1021/acs.jpclett.0c02711

Cited by 27 publications

(23 citation statements)

References 52 publications

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“…This transition only exists in unconventional superconductors, like Fe-, Mn-, and Cr-based, and heavy fermions. 1 − 5 However, the mechanism of superconductivity has long been discussed. Recently, antiferromagnetic fluctuation has been a common interpretation for the formation of Cooper pairs for Fe-based systems, thus inducing the emergence of superconducting states.…”

Section: Introductionmentioning

confidence: 99%

Pressure-Induced Transition from Spin to Superconducting States in Novel MnN₂

Zhao

Bao

et al. 2021

ACS Omega

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The connection between magnetism and superconductivity has long been discussed since the discovery of Fe-based superconductors. Here, we report the discovery of a pressure-induced transition from a spin to a superconducting state in novel MnN 2 based on ab initio calculations. The superconducting state can be obtained in two ways: the first is the pressure-induced transition from an AFM- P 2 1 / m to an NM- I 4/ mmm phase at 30 GPa, while the other is the pressure-induced transition from an FM- I 4/ mmm phase to magnetic vanishing at 14 GPa, which leads to a structural transition with the distortion of octahedrons to tetragonal pyramids. NM- I 4/ mmm- MnN 2 is superconductive with T c ≈ 17.6 K at 0 GPa. In the second way, electronic structure calculations indicate that the system transforms from a high-spin state to a low-spin state due to increasing crystal-field splitting, causing disappearance of magnetism; more electron occupancy around the Fermi level drives the emergence of superconductivity. Remarkably, I 4/ mmm- MnN 2 can achieve mutual spin-to-superconducting state transformation by pressure. Moreover, the AFM- P 2 1 / m- MnN 2 phase is extremely incompressible with the hardness above 20 GPa. Our results provide a reasonable and systematic interpretation for the connection between magnetism and superconductivity and give clues for achieving spin-to-superconducting switching materials with certain crystal features.

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Section: Introductionmentioning

confidence: 99%

Pressure-Induced Transition from Spin to Superconducting States in Novel MnN₂

Zhao

Bao

et al. 2021

ACS Omega

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“…The new class of ferromagnetic superconductors based on EuFe 2 As 2 parent compound is a unique playground in material science and solid state physics [1][2][3][4][5][6][7][8][9][10][11][12] due to accessible temperatures for the coexistence of superconducting and ferromagnetic orders on atomic scales of crystal lattice. Superconductivity in EuFe 2 As 2 -based ferromagnetic superconductors emerges by doping with phosphorus, [1][2][3][4] or rubidium.…”

Section: Introductionmentioning

confidence: 99%

Helical spin order in EuFe2As2 and EuRbFe4As4 single crystals

Golovchanskiy¹,

Щетинин²,

Pervakov³

et al. 2021

Preprint

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In this work, fabrication and characterization of magnetic properties of EuFe 2 As 2 and EuRbFe 4 As 4 single crystals is reported. Magnetization measurements of samples with well defined thin film geometry and crystal orientation demonstrate a striking similarity in ferromagnetic properties of Eu subsystems in these two compounds. Measurements with magnetic field applied along ab crystal planes reveal meta-magnetic transition in both compounds. Numerical studies employing the J z1 and J z2 Heisenberg model suggest that the ground state of the magnetic order in Eu subsystem for both compounds is the helical spin order with the helical angle about 2π/5, while the meta-magnetic transition is the helix-to-fan first order phase transition.

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“…The lateral geometry of LJJ makes them suitable for studying Josephson phenomena at the nanoscale by Scanning Probe Microscopies (SPM) such as Tunneling Microscopy and Spectroscopy [12,[19][20][21][22][23][24], Scanning SQUID [25][26][27][28][29] or Magnetic Force Microscopy (MFM) [13,[30][31][32]. The latter technique is particularly promising owing to its simplicity and its capacity to reveal the spatial distribution of the magnetic field over LJJ.…”

Section: Introductionmentioning

confidence: 99%

Lateral Josephson Junctions as Sensors for Magnetic Microscopy at Nano-Scale

Hovhannisyan¹,

Grebenchuk²,

Baranov³

et al. 2021

Preprint

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Lateral Josephson junctions (LJJ) made of two superconducting Nb electrodes coupled by Cufilm are applied to quantify the stray magnetic field of Co-coated cantilevers used in Magnetic Force Microscopy (MFM). The interaction of the magnetic cantilever with LJJ is reflected in the electronic response of LJJ as well as in the phase shift of cantilever oscillations, simultaneously measured. The phenomenon is theorized and used to establish the spatial map of the stray field. Based on our findings, we suggest integrating LJJs directly on the tips of cantilevers and using them as nanosensors of local magnetic fields in Scanning Probe Microscopes. Such probes are less invasive than conventional magnetic MFM cantilevers and simpler to realize than SQUID-on-tip sensors. [1].

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Electronic Structures and Surface Reconstructions in Magnetic Superconductor RbEuFe₄As₄

Cited by 27 publications

References 52 publications

Pressure-Induced Transition from Spin to Superconducting States in Novel MnN₂

Pressure-Induced Transition from Spin to Superconducting States in Novel MnN₂

Helical spin order in EuFe2As2 and EuRbFe4As4 single crystals

Lateral Josephson Junctions as Sensors for Magnetic Microscopy at Nano-Scale

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Electronic Structures and Surface Reconstructions in Magnetic Superconductor RbEuFe4As4

Cited by 27 publications

References 52 publications

Pressure-Induced Transition from Spin to Superconducting States in Novel MnN2

Pressure-Induced Transition from Spin to Superconducting States in Novel MnN2

Helical spin order in EuFe2As2 and EuRbFe4As4 single crystals

Lateral Josephson Junctions as Sensors for Magnetic Microscopy at Nano-Scale

Contact Info

Product

Resources

About

Electronic Structures and Surface Reconstructions in Magnetic Superconductor RbEuFe₄As₄

Pressure-Induced Transition from Spin to Superconducting States in Novel MnN₂

Pressure-Induced Transition from Spin to Superconducting States in Novel MnN₂