Coexistence of magnetism and superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeRh</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ir</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">In</mml

Pagliuso, P. G.; Petrović, C.; Movshovich, R.; Hall, D.; Hundley, M. F.; Sarrao, J. L.; Thompson, J. D.; Fisk, Z.

doi:10.1103/physrevb.64.100503

Cited by 177 publications

(135 citation statements)

References 16 publications

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“…These compounds are quasi-2D materials with the layered structure, which has been confirmed by the de Haas-van Alphen (dHvA) measurements [ 481,482,483,484,485]. The P − T phase diagram in CeRhIn 5 [ 477] and the phase diagram in the alloy system CeRh 1−x Ir x In 5 [ 486] indicate that the superconductivity appears in the neighborhood of the AF phase. The power-law behavior of the resistivity in the normal phase with T 1.3 in CeIrIn 5 (T c = 0.4K) [ 465] and T in CeCoIn 5 (T c = 2.3K) [ 466] implies the strong quasi-2D AF spin fluctuation.…”

Section: Ce-based Compoundsmentioning

confidence: 56%

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: Ce-based Compoundsmentioning

confidence: 56%

Theory of superconductivity in strongly correlated electron systems

et al. 2003

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“…12, TN0 (causing quantum critical behavior and its possible influence on UcS -section 2.1.2) can also be reached by substituting either Co or Ir for Rh. In the case of CeRh1-xIrxIn5, the specific heat above Tc shows [250] non-Fermi liquid behavior (C/T rising as T is lowered), consistent with a magnetic quantum critical point at TN 0 causing UcS. In contrast, the specific heat [251] above Tc in CeRh1-xCoxIn5 where TN  0 (around x=0.6-0.7, see Fig.…”

Section: Cerhin5mentioning

confidence: 75%

Unconventional superconductivity

Stewart

2017

Advances in Physics

211

165

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Abstract:"Conventional" superconductivity, as used in this review, refers to electron-phonon coupled superconducting electron pairs described by BCS theory. Unconventional superconductivity refers to superconductors where the Cooper pairs are not bound together by phonon-exchange but instead by exchange of some other kind, e. g. spin fluctuations in a superconductor with magnetic order either coexistent or nearby in the phase diagram. Such unconventional superconductivity has been known experimentally since heavy fermion CeCu2Si2, with its strongly correlated 4f electrons, was discovered to superconduct below 0.6 K in 1979. Since the discovery of unconventional superconductivity in the layered cuprates in 1986, the study of these materials saw Tc jump to 164 K by 1994. Further progess in high temperature superconductivity would be aided by understanding the cause of such unconventional pairing. This review compares the fundamental properties of 9 unconventional superconducting classes of materialsfrom 4f-electron heavy fermions to organic superconductors to classes where only three known members exist to the cuprates with over 200 examples -with the hope that common features will emerge to help theory explain (and predict!) these phenomena. In addition, three new emerging classes of superconductors (topological, interfacial -e. g. FeSe on SrTiO3, and H2S under high pressure) are briefly covered, even though their "conventionality" is not yet fully determined.

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“…Interestingly, some of these properties, such as the concomitant observation of unconventional SC and heavy fermion (HF) behavior, seem to be favored in systems with tetragonal structure. Well known examples are the Ce-based heavy fermions superconductors CeM In 5 (M = Co, Rh, Ir), Ce 2 M In 8 (M = Co, Rh, Pd), CePt 2 In 7 (M = Co, Rh, Ir, Pd) [3][4][5][6][7] and CeCu 2 Si 2 [8,9].…”

Section: Introductionmentioning

confidence: 99%

Physical properties and magnetic structure of the intermetallicCeCuBi2compound

et al. 2014

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In this work, we combine magnetization, pressure dependent electrical resistivity, heat-capacity, 63 Cu Nuclear Magnetic Resonance (NMR) and X-ray resonant magnetic scattering experiments to investigate the physical properties of the intermetallic CeCuBi2 compound. Our single crystals show an antiferromagnetic ordering at TN ≃ 16 K and the magnetic properties indicate that this compound is an Ising antiferromagnet. In particular, the low temperature magnetization data revealed a spin-flop transition at T = 5 K when magnetic fields of about 5.5 T are applied along the c-axis. Moreover, the X-ray magnetic diffraction data below TN revealed a commensurate antiferromagnetic structure with propagation wavevector (0 0 1 2 ) with the Ce 3+ moments oriented along the c-axis. Furthermore, our heat capacity, pressure dependent resistivity, and temperature dependent 63 Cu NMR data suggest that CeCuBi2 exhibits a weak heavy fermion behavior with strongly localized Ce 3+ 4f electrons. We thus discuss a scenario in which both the anisotropic magnetic interactions between the Ce 3+ ions and the tetragonal crystalline electric field effects are taking into account in CeCuBi2.

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Coexistence of magnetism and superconductivity inCeRh1−xIrxIn

Cited by 177 publications

References 16 publications

Theory of superconductivity in strongly correlated electron systems

Theory of superconductivity in strongly correlated electron systems

Unconventional superconductivity

Physical properties and magnetic structure of the intermetallicCeCuBi2compound

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