Pressure-induced superconductivity in ferromagnetic UIr without inversion symmetry

Akazawa, Teruhiko; Hidaka, Hisao; Fujiwara, T.; Kobayashi, Tatsuo; Yamamoto, Etsuji; Haga, Yoshinori; Settai, Rikio; Ōnuki, Yoshichika

doi:10.1088/0953-8984/16/4/l02

Cited by 228 publications

(201 citation statements)

References 9 publications

(12 reference statements)

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“…The structure lacks mirror-like symmetry [10,11] as for CePt 3 Si [12] or UIr [13]. From this and other points of view, Pt-and Pd-end compounds are very different from MgNi 3 C [11].…”

Section: Introductionmentioning

confidence: 99%

Discovery of Li2(Pd,Pt)3B superconductors

Badica

Togano

Takeya

et al. 2007

Physica C: Superconductivity and its Applications

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Critical temperature T c of the Li 2 (Pd 1-x Pt x ) 3 B was reported to be 7-8K for x=0 and 2.2-2.8K for x=1. In this article we present our preliminary results on behavior of magnetization-temperature curves with starting composition of Pd-B precursor, y-Li concentration in Li y Pd 3 B and postannealing of the Pd-end compound. Results suggest that to maximize T c ratio Pd:B should be close to 3:1, while y-Li has to be optimum. The lowest T c for Li y Pd 3 B was 4.4-4.6K, while postannealings at 560°C allowed enhancement of T c up to 8.2-8.4K. Compositions Li 2 Z 3 B with Z=Ni, Ru, Rh, Re, Ag are not superconducting down to 1.8K. Exception is composition with Re showing superconductivity due to Re 3 B compound. All samples were prepared by arc melting.

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“…The structure lacks mirror-like symmetry [10,11] as for CePt 3 Si [12] or UIr [13]. From this and other points of view, Pt-and Pd-end compounds are very different from MgNi 3 C [11].…”

Section: Introductionmentioning

confidence: 99%

Discovery of Li2(Pd,Pt)3B superconductors

Badica

Togano

Takeya

et al. 2007

Physica C: Superconductivity and its Applications

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“…36,41 An alternative approach to realizing a one-dimensional topological superconductor is to deposit a ferromagnetic semiconductor wire on top of a ferromagnetic superconductor. [1][2][3][4] A particularly attractive candidate ferromagnetic semiconductor is europium oxide (EuO), which is known to possess nearly spin-polarized bands. 85,86 EuO becomes ferromagnetic below 70K under ambient pressure and the Curie temperature is known to increase with pressure reaching 200K under 1.5 × 10 5 atmospheres.…”

Section: Topological Superconductivity and Majorana Fermionsmentioning

confidence: 99%

Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

Takei

Galitski

2012

Phys. Rev. B

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Motivated by the recent experiment of Wang et al. [Nature Physics 6, 389 (2010)], who observed a highly unusual transport behavior of ferromagnetic Cobalt nanowires proximity-coupled to superconducting electrodes, we study proximity effect and temperature-dependent transport in such a mesoscopic hybrid structure. It is assumed that the asymmetry in the tunneling barrier gives rise to the Rashba spin-orbit-coupling in the barrier that enables induced p-wave superconductivity in the ferromagnet to exist. We first develop a microscopic theory of Andreev scattering at the spin-orbit-coupled interface, derive a set of self-consistent boundary conditions, and find an expression for the p-wave mini-gap in terms of the microscopic parameters of the contact. Second, we study temperature-dependence of the resistance near the superconducting transition and find that it should generally feature a fluctuation-induced peak. The upturn in resistance is related to the suppression of the singleparticle density of states due to the formation of fluctuating pairs, whose tunneling is suppressed. In conclusion, we discuss this and related setups involving ferromagnetic nanowires in the context of one-dimensional topological superconductors. It is argued that to realize unpaired end Majorana modes, one does not necessarily need a half-metallic state, but a partial spin polarization may suffice. Finally, we propose yet another related class of material systems -ferromagnetic semiconductor wires coupled to ferromagnetic superconductors -where direct realization of Kitaev-Majorana model should be especially straightforward.

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“…Within the temperature interval between T c and T C , the ferromagnetism and superconductivity coexist macroscopically (in a spatially inhomogeneous manner), whereas a new sinusoidallymodulated state with a wavelength ∼100 Å and superconductivity coexist microscopically (within the same volume element) [206]. In contrast, the recently discovered uranium-based compounds UGe 2 (under pressure) [207], URhGe [24], UIr (under pressure) [208,209], and UCoGe [210] appear to exhibit the microscopic coexistence of superconductivity and true itinerant electron ferromagnetism. Such a coexistence is intriguing since, in a conventional superconductor, the large internal field generated by the ferromagnetic order would be expected to destroy the superconducting state by breaking the spin-singlet Cooper pairs [211].…”

Section: Ferromagnetic Superconductorsmentioning

confidence: 99%

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

et al. 2010

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Standard models for simple metals and insulators often fail for systems based on elements with unstable d-or f -electron shells, where strong electronic correlations can generate new and unexpected states of matter. Such a scenario can often be induced when a magnetic phase transition is tuned to absolute zero temperature by an external control parameter such as chemical composition, pressure or magnetic field. At the resulting quantum critical point (QCP), emergent phenomena, such as unconventional superconductivity and novel magnetic phases are frequently observed. The temperature and energy dependences of the physical properties are also found to deviate from expectations for a simple Fermi liquid. This "non-Fermi-liquid" (NFL) behavior is commonly manifested as weak power laws and logarithmic divergences in the physical properties at low temperatures and is often found in a V-shaped region near a QCP, which has become the "classic" QCP phase diagram. However, there is also a growing number of materials where the NFL behavior either occurs far away from the QCP, within an ordered phase, or may not be associated with any putative QCP. Thus, after nearly 20 years of research, it remains unknown whether NFL physics is universal, or if a multitude of unique subclasses exist. In this article, we review research that has primarily been carried out in our laboratory on systems that exhibit NFL behavior that does not conform to the "classic" QCP scenario.

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Pressure-induced superconductivity in ferromagnetic UIr without inversion symmetry

Cited by 228 publications

References 9 publications

Discovery of Li2(Pd,Pt)3B superconductors

Discovery of Li2(Pd,Pt)3B superconductors

Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

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