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Ma, Jie; Yan, Jiaqiang; Diallo, Souleymane; Stevens, R.R.; Llobet, Anna; Trouw, F.; Abernathy, D. L.; Stone, M. B.; McQueeney, R. J.

doi:10.1103/physrevb.84.224115

Cited by 21 publications

(11 citation statements)

References 28 publications

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“…In [206], in the framework of the t − J model [207] with the Coulomb interaction V between the fermions at neighboring carbon atoms of the hexagonal lattice of graphene (investigated by the method of the functional renormalization group), a triplet f -wave pairing and a singlet d + id-wave pairing far from the half-filling were detected. The possibility to realize d + id-wave chiral superconductivity due to the spinfluctuation mechanism was also confirmed by quantum Monte Carlo calculations [208,209]. The situation where the Fermi level is near one of the Van Hove singularities in the density of states of graphene monolayer was considered in [210].…”

Section: Superconductivity In An Idealized Graphene Monolayermentioning

confidence: 96%

Anomalous superconductivity and superfluidity in repulsive fermion systems

2015

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We discuss the mechanisms of unconventional superconductivity and superfluidity in 3D and 2D fermionic systems with purely repulsive interaction at low densities. We construct phase diagrams of these systems and find the areas of the superconducting state in free space, as well as on the lattice in the framework of the Fermi-gas model with hard-core repulsion, the Hubbard model, the Shubin-Vonsovsky model, and the t − J model. We demonstrate that the critical superconducting temperature can be greatly increased in the spin-polarized case or in a two-band situation already at low densities. The proposed theory is based on the Kohn-Luttinger mechanism or its generalizations and explains or predicts anomalous p-, d-, and f -wave pairing in various materials, such as high-temperature superconductors, the idealized monolayer and bilayer of doped graphene, heavy-fermion systems, layered organic superconductors, superfluid 3 He, spin-polarized 3 He mixtures in 4 He, ultracold quantum gases in magnetic traps, and optical lattices.

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Section: Superconductivity In An Idealized Graphene Monolayermentioning

confidence: 96%

Anomalous superconductivity and superfluidity in repulsive fermion systems

2015

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“…2,3 PrFeO 3 exhibits colossal dielectric constant with e 0 $ 10 4 (Ref. 4) and also has G-type antiferromagnetic structure with T N ¼ 707 K. 5 In PrFeO 3 , Fe 3þ is orbitally non-degenerate and the distortion in the FeO 6 octahedra is driven entirely by the ionic-size effect, 6 whereas in PrMnO 3 , Mn 3þ is a Jahn-Teller (JT) ion and the distortion in MnO 6 is due to JT distortion and octahedra tilting. In PrMnO 3 , a small canting below N eel temperature (T N ¼ 99 K) arises from the canting of the A-type antiferromagnetic (AFM) structure due to DzyaloshinskiiMoriya (DM) interaction, which is generated by a buckling of the orthorhombic oxygen octahedra.…”

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confidence: 99%

Jahn-Teller assisted polaron hopping and associated dielectric response of PrFe0.5Mn0.5O2.95

Ganeshraj

Kavita

Mahendiran

et al. 2013

Applied Physics Letters

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The canted G-type antiferromagnet PrFe0.5Mn0.5O2.95 shows an enhanced Jahn-Teller (JT) distortion below 150 K (T*). The resistivity of the grains can be described by variable range hopping between the localized states, and there is a dominant grain boundary contribution to dc resistivity, below T*. Above T*, the total dc resistivity follows small polaron hopping (SPH) conduction. A giant dielectric response is observed, and it can be ascribed to Maxwell-Wagner polarization and SPH mechanism. Despite the low concentration of JT active Mn3+ ions, our result indicates an important role of JT effect on physical properties of PrFe0.5Mn0.5O2.95.

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“…Polycrystalline samples were prepared using a standard solid‐state reaction technique . The starting materials, high‐purity Pr 6 O 11 (99.9%), SrCO 3 (99.0%), and Fe 2 O 3 (99.99%) powders, were weighed out at the nominal composition and fully mixed.…”

Section: Methodsmentioning

confidence: 99%

Study on mechanical, dielectric and magnetic properties of Pr_1-xSr_xFeO₃ceramics

Zhu

et al. 2014

Phys. Status Solidi A

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The mechanical spectra of Pr1–xSrxFeO3–δ (x = 0.5, 0.55, and 0.6) ceramics were performed at kHz frequencies from 100 to 350 K. An internal friction (IF) peak associated with modulus defect around 130 K and a modulus kink at 200 K were observed. This IF peak temperature shows frequency‐dispersive behavior. The dielectric spectra and magnetization measurements were used to clarify the origin of the anomaly in IF and modulus. The dielectric spectra provide clear evidence for the relaxation behavior of IF peak and the activation energies of 0.14, 0.13, and 0.11 eV were derived from the Arrhenius law for Pr0.5Sr0.5FeO3, Pr0.45Sr0.55FeO3, and Pr0.4Sr0.6FeO3 samples, respectively. The relaxation behavior is ascribed to the charge‐carrier hopping between Fe3+ and Fe4+. Furthermore, the magnetization measurement confirms that the kink in the reduced Young's modulus is associated with a spin‐glass transition. In addition, another dielectric anomaly at 200 K may be related to the magneto dielectric effect.

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Role of magnetic exchange energy on charge ordering inR1/3Sr2/3FeO

Cited by 21 publications

References 28 publications

Anomalous superconductivity and superfluidity in repulsive fermion systems

Anomalous superconductivity and superfluidity in repulsive fermion systems

Jahn-Teller assisted polaron hopping and associated dielectric response of PrFe0.5Mn0.5O2.95

Study on mechanical, dielectric and magnetic properties of Pr_1-xSr_xFeO₃ceramics

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Role of magnetic exchange energy on charge ordering inR1/3Sr2/3FeO

Cited by 21 publications

References 28 publications

Anomalous superconductivity and superfluidity in repulsive fermion systems

Anomalous superconductivity and superfluidity in repulsive fermion systems

Jahn-Teller assisted polaron hopping and associated dielectric response of PrFe0.5Mn0.5O2.95

Study on mechanical, dielectric and magnetic properties of Pr1-xSrxFeO3ceramics

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Study on mechanical, dielectric and magnetic properties of Pr_1-xSr_xFeO₃ceramics