Unconventional Superconductivity and Heavy Fermion Behavior in PrOs4Sb12

Maple, M. B.; Frederick, N. A.; Ho, P. C.; Yuhasz, W. M.; Yanagisawa, Tatsuya

doi:10.1007/s10948-006-0165-8

Cited by 43 publications

(56 citation statements)

References 107 publications

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“…A brief description is given of the heavy femion compound PrOs 4 Sb 12 in which unconventional superconductivity occurs near an antiferroquadrupolar ordered state and may be mediated by quadrupolar fluctuations [27,28].…”

Section: Outline Of This Papermentioning

confidence: 99%

“…After Refs. [28,260] nomena [250]. Of these compounds, PrOs 4 Sb 12 has received the most attention, owing largely to the fact that it is the first Pr-based heavy fermion superconductor, for which T c = 1.85 K and H c2 (0) = 2.5 T [27,28].…”

Section: Pros 4 Sb 12mentioning

confidence: 99%

“…[28,260] nomena [250]. Of these compounds, PrOs 4 Sb 12 has received the most attention, owing largely to the fact that it is the first Pr-based heavy fermion superconductor, for which T c = 1.85 K and H c2 (0) = 2.5 T [27,28]. The superconducting state breaks time reversal symmetry [252], apparently consists of several distinct superconducting phases, some of which may have point nodes in the energy gap [253,254], and may involve triplet spin pairing of electrons [255].…”

Section: Pros 4 Sb 12mentioning

confidence: 99%

“…Additionally, it has been shown that there likely are multiple superconducting bands [254,[256][257][258][259]. The superconductivity develops from a Fermi liquid ground state where the conduction electrons apparently have masses that are fifty times larger than the free electron mass [27,28]. It is evident that the heavy quasiparticles participate in the superconductivity, in that the specific heat jump C is comparable with γ T c [28].…”

Section: Pros 4 Sb 12mentioning

confidence: 99%

“…The superconductivity develops from a Fermi liquid ground state where the conduction electrons apparently have masses that are fifty times larger than the free electron mass [27,28]. It is evident that the heavy quasiparticles participate in the superconductivity, in that the specific heat jump C is comparable with γ T c [28]. It has also been demonstrated that the superconductivity develops out of a non-magnetic 1 crystalline electric field (CEF) ground state with a low lying 5 (using the notation for a cubic CEF) and that the application of magnetic fields larger than 4.5 T induces a high field ordered phase (HFOP) [28,260] which is thought to be due to antiferroquadrupolar ordering [261] (Fig.…”

Section: Pros 4 Sb 12mentioning

confidence: 99%

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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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Section: Outline Of This Papermentioning

confidence: 99%

Section: Pros 4 Sb 12mentioning

confidence: 99%

Section: Pros 4 Sb 12mentioning

confidence: 99%

Section: Pros 4 Sb 12mentioning

confidence: 99%

Section: Pros 4 Sb 12mentioning

confidence: 99%

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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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Ferromagnetic and ferroelectric quantum phase transitions

Rowley

Smith

Dean

et al. 2010

Physica Status Solidi (b)

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The applicability of mean field models of ferroelectric and ferromagnetic quantum critical points is examined for a selection of d-electron systems. Crucially, we find that the tendency of the effective interaction between critical fluctuation modes to become attractive and anomalous as the ordering temperatures tend to absolute zero results in particularly complex and striking phenomena. The multiplicity of quantum critical fields at the border of metallic ferromagnetism, in particular, is discussed here. 1 Introduction We consider the nature of quantum phase transitions driven by changes in composition of materials or changes in applied pressure, magnetic field or electric field in the low temperature limit. Quantum phase transitions exhibit surprisingly subtle and complex behaviour even in comparatively simple examples of cubic ferroelectric materials and ferromagnetic metals of high purity, which will be the main focus of this article.Early descriptions of quantum critical points (QCP), developed independently in ferroelectric materials [1] and ferromagnetic metals [2][3][4][5][6] in the 1970s, were based essentially on f 4 -quantum field models. They differ from the Ginzburg-Landau-Wilson models of classical critical phenomena by the inclusion of the dynamics of the order parameter field f(r,t), which represents a coarse-grained electric or magnetic polarization as a function of spatial coordinate r and temporal coordinate t (the imaginary time, which has a finite range at non-zero temperatures, 0 < t < h=k B T) [7]. The inclusion of the thermal coordinate increases the relevant dimension from the spatial dimension d to the effective dimension d eff ¼ d þ z, where z is the dynamical exponent defining the dispersion relation, i.e., the wavevector dependence of the frequency spectrum of fluctuations of the field f at small wavevectors (see x2).The self-consistent-field approximation, which applies in the case of classical critical phenomena for d > 4 in the classical f 4 model, might apply under a less restrictive condition d > 4 -z in the f 4 quantum treatment of critical

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