Magnetic fields above the superconducting ferromagnet UCoGe

Hykel, Danny; Paulsen, C.; Aoki, Dai; Kirtley, J. R.; Hasselbach, K.

doi:10.1103/physrevb.90.184501

Cited by 20 publications

(15 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even in the absence of external field in a ferromagnet there is an internal field H int acting on the electron charges. The internal magnetic field in all uranium superconducting ferromagnets is larger than the lower critical field H c1 (see, for instance, the paper [14]). Hence, the Meissner state is absent and the superconducting state is always the Abrikosov mixed state with space inhomogeneous distributions of the order parameter and the internal magnetic field.…”

Section: Quasiparticles Spectrum In a Ferromagnet Superconductor With...mentioning

confidence: 99%

“…Similar size of domains has been recently measured in UCoGe. [14] So, it is natural to consider these ferromagnetic superconductors as triplet superconductors similar to superfluid phases of He 3 . It must be kept in mind, however, that unlike to the liquid helium which is completely isotropic neutral Fermi liquid here we deal with superconductivity developing in strongly anisotropic ferromagnetic metals.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Superconductivity in uranium ferromagnets

Минеев¹

2017

Успехи физических наук

View full text Add to dashboard Cite

The theoretical description and the survey of physical properties of superconducting states in the uranium ferromagnetic materials are presented. On the basis of microscopic theory is shown that the coupling between the electrons in these ferromagnetic metals by means of magnetization fluctuations gives rise the triplet pairing superconducting state and the general form of the order parameter dictated by the symmetry is established. The theory allows to explain some specific observations including peculiar phenomenon of reentrant superconductivity in URhGe in magnetic field perpendicular to the direction of spontaneous magnetization.In addition we describe several particular topics relating to uranium superconducting ferromagnets: (i) critical magnetic relaxation in dual localized-itinerant ferromagnets, (ii) phase transition to ferromagnetic state in Fermi liquid and UGe2, (iii) superconducting ordering in ferromagnetic metals without inversion symmetry.

show abstract

Section: Quasiparticles Spectrum In a Ferromagnet Superconductor With...mentioning

confidence: 99%

mentioning

confidence: 99%

Superconductivity in uranium ferromagnets

Минеев¹

2017

Успехи физических наук

View full text Add to dashboard Cite

show abstract

“…Scanning probe microscopy based on micro-and nano-scale superconducting quantum interference devices (SQUIDs) has attracted growing attention in recent years in a broad range of fields [1][2][3][4][5][6][7][8][9]. The significant technological advances in the development of versatile scanning SQUID probes and imaging methods have led to key insights into microscopic properties of superconductors [4,10,11], vortex dynamics [12][13][14][15][16], magnetism at oxide interfaces [17][18][19][20][21], edge transport and magnetism in topological states of matter [22][23][24], and dynamics of phase transitions [25]. The two main approaches to the fabrication of scanning SQUIDs are based on planar lithographic techniques [26][27][28][29][30][31][32][33] and on self-aligned deposition on a quartz pipette, forming a SQUID-on-tip (SOT) [34][35][36][37][38].…”

mentioning

confidence: 99%

Sputtered Mo ₆₆ Re ₃₄ SQUID-on-Tip for High-Field Magnetic and Thermal Nanoimaging

et al. 2019

View full text Add to dashboard Cite

Scanning nanoscale superconducting quantum interference devices (SQUIDs) are gaining interest as highly sensitive microscopic magnetic and thermal characterization tools of quantum and topological states of matter and devices. Here we introduce a novel technique of collimated differential-pressure magnetron sputtering for versatile self-aligned fabrication of SQUID-on-tip (SOT) nanodevices, which cannot be produced by conventional sputtering methods due to their diffusive, rather than the required directional point-source, deposition. The new technique provides access to a broad range of superconducting materials and alloys beyond the elemental superconductors employed in the existing thermal deposition methods, opening the route to greatly enhanced SOT characteristics and functionalities. Utilizing this method, we have developed MoRe SOT devices with sub-50 nm diameter, magnetic flux sensitivity of 1.2 µΦ0/Hz 1/2 up to 3 T at 4.2 K, and thermal sensitivity better than 4 µK/Hz 1/2 up to 5 T -about five times higher than any previous report -paving the way to nanoscale imaging of magnetic and spintronic phenomena and of dissipation mechanisms in previously inaccessible quantum states of matter.

show abstract

“…Experimentally, FM domains have been observed in UCoGe by scanning SQUID at ambient pressure, and the domain wall (DW) width was estimated to be very small, ∼ 0.1-1nm, as expected from the strong Ising anisotropy of UCoGe 12 . The magnetic flux density is changed only slightly as the system enters the FM+SC phase from the non-superconducting FM phase.…”

Section: Introductionmentioning

confidence: 98%

Fulde-Ferrell state in a ferromagnetic chiral superconductor with magnetic domain walls

Tada

2018

Phys. Rev. B

View full text Add to dashboard Cite

Motivated by the recent theoretical and experimental progress in the heavy fermion system UCoGe, we study ferromagnetic chiral superconductors in the presence of magnetic domains. Within mean field approximations, it is shown that chiral superconducting domains are naturally induced by the ferromagnetic domains. The domain wall current flows in the opposite direction to the naively expected one as in 3 He-A phase due to contributions from "unpaired electrons". Consequently, the domain wall current flows in the same direction with that of surface currents when the magnetic domain wall lies parallel to the sample surface, and therefore they contribute to the net current along the whole sample. We find that, due to the non-cancellation between the domain wall current and surface current, a Fulde-Ferrell-like superconducting state can be stabilized in an anisotropic sample for all the temperatures below the superconducting transition temperature.

show abstract

Magnetic fields above the superconducting ferromagnet UCoGe

Abstract: International audienc

Cited by 20 publications

References 24 publications

Superconductivity in uranium ferromagnets

Superconductivity in uranium ferromagnets

Sputtered Mo ₆₆ Re ₃₄ SQUID-on-Tip for High-Field Magnetic and Thermal Nanoimaging

Fulde-Ferrell state in a ferromagnetic chiral superconductor with magnetic domain walls

Contact Info

Product

Resources

About

Magnetic fields above the superconducting ferromagnet UCoGe

Abstract: International audienc

Cited by 20 publications

References 24 publications

Superconductivity in uranium ferromagnets

Superconductivity in uranium ferromagnets

Sputtered Mo 66 Re 34 SQUID-on-Tip for High-Field Magnetic and Thermal Nanoimaging

Fulde-Ferrell state in a ferromagnetic chiral superconductor with magnetic domain walls

Contact Info

Product

Resources

About

Sputtered Mo ₆₆ Re ₃₄ SQUID-on-Tip for High-Field Magnetic and Thermal Nanoimaging