Neutron-scattering study of incommensurate magnetic order in the heavy-fermion superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">UNi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Al</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Lussier, J. G.; Mao, Ming; Schröder, A.; Garrett, J.D.; Gaulin, B. D.; Shapiro, S. M.; Buyers, W. J. L.

doi:10.1103/physrevb.56.11749

Cited by 34 publications

(20 citation statements)

References 30 publications

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“…UPd 2 Al 3 is an AF metal with Q = (0, 0, 0.5) below T N = 14.5K [ 499] and coexists with the anisotropic even-parity superconductivity below T c = 2K [ 452,454]. The isostructural compound UNi 2 Al 3 is in the SDW state with Q = (0.5 ± τ, 0, 0.5) and τ = 0.11 ± 0.003 below T N = 4.6K [ 500,501]. This SDW state coexists with the unconventional superconductivity below T c = 1.2K [ 453], which may be the odd-parity state as indicated by the NMR/NQR measurement [ 455].…”

Section: U-based Compoundsmentioning

confidence: 99%

“…UPd 2 Al 3 is an AF metal [ 499] and coexists with the anisotropic even-parity superconductivity below T c = 2K [ 452,454]. UNi 2 Al 3 is the SDW state with Q = (0.5 ± τ, 0, 0.5) [ 500,501] and coexists with the odd-parity superconductivity at T c = 1.2K [ 453]. The AF state in UPd 2 Al 3 possesses relatively large ordered moments 0.85µ B /U as compared with 0.2µ B /U in UNi 2 Al 3 , and the AF transition seems to be that of the localized f -electron system.…”

Section: Um 2 Al 3 (M=pd and Ni)mentioning

confidence: 99%

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Theory of superconductivity in strongly correlated electron systems

et al. 2003

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In this article we review essential natures of superconductivity in strongly correlated electron systems (SCES) from a universal point of view. First we summarize experimental results on SCES by focusing on typical materials such as cuprates, BEDT-TTF organic superconductors, and ruthenate Sr 2 RuO 4 . Experimental results on other important SCES, heavy-fermion systems, will be reviewed separately. The formalism to discuss superconducting properties of SCES is shown based on the Dyson-Gor'kov equations. Here two typical methods to evaluate the vertex function are introduced: One is the perturbation calculation up to the third-order terms with respect to electron correlation. Another is the fluctuationexchange (FLEX) method based on the Baym-Kadanoff conserving approximation. The results obtained by the FLEX method are in good agreement with those obtained by the perturbation calculation. In fact, a reasonable value of T c for spin-singlet d-wave superconductivity is successfully reproduced by using both methods for SCES such as cuprates and BEDT-TTF organic superconductors. As for Sr 2 RuO 4 exhibiting spin-triplet superconductivity, it is quite difficult to describe the superconducting transition by using the FLEX calculation. However, the superconductivity can be naturally explained by the perturbation calculation, since the third-order terms in the anomalous self-energy play the essential role to realize the triplet superconductivity. Another important purpose of this article is to review anomalous electronic properties of SCES near the Mott transition, since the nature of the normal state in SCES has been one of main issues to be discussed. Especially, we focus on pseudogap phenomena observed in under-doped cuprates and organic superconductors. A variety of scenarios to explain the pseudogap phenomena based on the superconducting and/or spin fluctuations are critically reviewed and examined in comparison with experimental results. According to the recent theory, superconducting fluctuations, inherent in the quasi-two-dimensional and strong-coupling superconductors, are the origin of the pseudogap formation. In these compounds, superconducting fluctuations induce a kind of resonance between the Fermi-liquid quasi-particle and the Cooper-pairing states. This resonance gives rise to a large damping effect of quasi-particles and reduces the spectral weight near the Fermi energy. We discuss the magnetic and transport properties as well as the single-particle spectra in the pseudogap state by the microscopic theory of the superconducting fluctuations. As for heavy-fermion superconductors, experimental results are reviewed and several theoretical analyses on the mechanism are provided based on the same viewpoint as explained above.

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Section: U-based Compoundsmentioning

confidence: 99%

Section: Um 2 Al 3 (M=pd and Ni)mentioning

confidence: 99%

Theory of superconductivity in strongly correlated electron systems

et al. 2003

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“…The critical temperatures T N for antiferromagnetism and T c for superconductivity differ by a factor of 3 and 2, respectively (T N ≈ 4 K and T c = 1 K for UNi 2 Al 3 ; T N = 14 K and T c = 2 K for UPd 2 Al 3 ), and also the effective magnetic moment per uranium atom in the antiferromagnetic phase differs considerably: 0.85µ B for UPd 2 Al 3 , 4) and approximately 0.2µ B for UNi 2 Al 3 . 5,6) Most remarkable is the difference of the antiferromagnetic order: UPd 2 Al 3 has a simple, commensurate ordering wave vector, 4) whereas the wave vector of UNi 2 Al 3 is incommensurate. 5,6) According to detailed neutron studies in zero magnetic field, the antiferromagnetic order of UNi 2 Al 3 is an amplitude modulated magnetization wave with the magnetic moments in the basal plane.…”

Section: Physikalisches Institut Universität Stuttgart D-70550 Stutmentioning

confidence: 99%

“…5,6) Most remarkable is the difference of the antiferromagnetic order: UPd 2 Al 3 has a simple, commensurate ordering wave vector, 4) whereas the wave vector of UNi 2 Al 3 is incommensurate. 5,6) According to detailed neutron studies in zero magnetic field, the antiferromagnetic order of UNi 2 Al 3 is an amplitude modulated magnetization wave with the magnetic moments in the basal plane.…”

Section: Physikalisches Institut Universität Stuttgart D-70550 Stutmentioning

confidence: 99%

Magnetoresistance and Phase Diagram of Thin-Film UNi₂Al₃

et al. 2011

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We study the dc resistivity of UNi 2 Al 3 thin films as a function of temperature and magnetic field. We focus on the temperature range around the antiferromagnetic transition (T N ≈ 4 K in zero applied field). From a clear signature of T N in the dc resistance along the crystallographic a-direction, we extract the shape of the magnetic phase diagram. Here we find quantitative differences in comparison to previous studies on bulk crystals.

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“…[222] Coexistence of superconductivity and antiferromagnetism compounds. [223][224][225][226][227][228] Since antiferromagnetism in the FeAs-based superconductors originates from conduction electrons that also form the Cooper pairs below T c , it is intriguing that superconductivity and antiferromagnetism compete for the same electrons which was not expected, especially when it is known that the magnetism is generally detrimental for superconductivity.…”

Section: Interplay Between Superconductivity and Antiferromagnetismmentioning

confidence: 99%

Structural and magnetic properties of transition metal substituted BaFe<sub>2</sub>As<sub>2</sub> compounds studied by x-ray and neutron scattering

Kim

2012

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Neutron-scattering study of incommensurate magnetic order in the heavy-fermion superconductorUNi2Al3

Cited by 34 publications

References 30 publications

Theory of superconductivity in strongly correlated electron systems

Theory of superconductivity in strongly correlated electron systems

Magnetoresistance and Phase Diagram of Thin-Film UNi₂Al₃

Structural and magnetic properties of transition metal substituted BaFe<sub>2</sub>As<sub>2</sub> compounds studied by x-ray and neutron scattering

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Neutron-scattering study of incommensurate magnetic order in the heavy-fermion superconductorUNi2Al3

Cited by 34 publications

References 30 publications

Theory of superconductivity in strongly correlated electron systems

Theory of superconductivity in strongly correlated electron systems

Magnetoresistance and Phase Diagram of Thin-Film UNi2Al3

Structural and magnetic properties of transition metal substituted BaFe<sub>2</sub>As<sub>2</sub> compounds studied by x-ray and neutron scattering

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Product

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Magnetoresistance and Phase Diagram of Thin-Film UNi₂Al₃