The thermoelectric power of AlMn alloys

Cooper, J. R.; Vučić, Zlatko; Babić, Emil

doi:10.1088/0305-4608/4/9/020

Cited by 31 publications

(14 citation statements)

References 28 publications

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“…On the other hand, the weak p-variation of T * explains the difference in the observed scaling behavior between here and Ref. [29] where the CF effect is absent.…”

Section: Resultscontrasting

confidence: 77%

Scaling behavior of temperature-dependent thermopower inCeAu2Si2under pressure

et al. 2016

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We report a combined study of in-plane resistivity and thermopower of the pressure-induced heavy fermion superconductor CeAu2Si2 up to 27.8 GPa. It is found that thermopower follows a scaling behavior in T /T * almost up to the magnetic critical pressure pc ∼ 22 GPa. By comparing with resistivity results, we show that the magnitude and characteristic temperature dependence of thermopower in this pressure range are governed by the Kondo coupling and crystal-field splitting, respectively. Below pc, the superconducting transition is preceded by a large negative thermopower minimum, suggesting a close relationship between the two phenomena. Furthermore, thermopower of a variety of Ce-based Kondo-lattices with different crystal structures follows the same scaling relation up to T /T * ∼ 2.

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“…On the other hand, the weak p-variation of T * explains the difference in the observed scaling behavior between here and Ref. [29] where the CF effect is absent.…”

Section: Resultscontrasting

confidence: 77%

Scaling behavior of temperature-dependent thermopower inCeAu2Si2under pressure

et al. 2016

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“…Decoherence destroys quantum interference, so the correspondence between quantum and classical models is mantained. The connection between classical and quantum systems have beeen also discussed by Cooper it et al [8] analyzing the relationship between chaos and the variational approximation.…”

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confidence: 98%

From Classical Chaos to Decoherence in Robertson–walker Cosmology

1999

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We analyze the relationship between classical chaos and particle creation in RobertsonWalker cosmological models with gravity coupled with a scalar field. Within our class of models chaos and particle production are seen to arise in the same cases. Particle production is viewed as the seed of decoherence, which enables the quantum to classical transition and ensures that the correspondence between the quantum and classically chaotic models will be valid.Historically, physics has provided a description of the arrow of time by means of the second law of thermodynamics: the entropy of the universe, or any isolated system, grows with time. However, physicists generally accept that this second law is not a fundamental law of nature; local, microphysical laws are invariant under time inversions, while temporal asymmetry manifests itself in macroscopic physics and arises from a restriction on the boundary conditions which select the state of the universe among those satisfying the dynamical laws. 1 In fact, a number of apparently different, well-known arrows of time can be identified in different areas of physics, which are not completely independent. In this letter we would like to propose one such relationship, between the dynamical instabilities that act as seeds of chaos at the classical level, and the quantum to classical transition coming from particle creation in a cosmological scenario. 2 In a classical theory, chaos already opens up ways of explaining the origin of the arrow of time, 3 and therefore, in a cosmological setting, of improving our knowledge of cosmological statistical mechanics and thermodynamics. Furthermore, just as non-integrability and dynamical instability are, at the classical level, the causes of chaos; they are also, at the quantum level, a cause of the instability of quantum *

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“…Another method to estimate T coh can be adapted from the empirical observation that for T T K the thermopower related to the single-ion Kondo effect (S K ) varies like S K = AT /(T + 0.35T K ) [25]. By replacing in this formula T K by T coh , one obtains [cf.…”

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confidence: 99%

Quantum criticality in Ce2PdIn8: A thermoelectric study

2011

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We report the Nernst effect (ν) and thermoelectric power (S) data for the Ce2PdIn8 heavyfermion compound. Both S and ν behave anomalously at low temperatures: the thermopower shows a Kondo-like maximum at T = 37 K, while the Nernst coefficient becomes greatly enhanced and field dependent below T ≈ 30 K. In the zero-T limit S/T and ν/T diverge logarithmically, what is related to occurrence of the quantum critical point (QCP). Presented results suggest that the antiferromagnetic spin-density-wave scenario may be applicable to QCP in Ce2PdIn8. PACS numbers: 72.15.Jf, 74.40.Kb, 74.70.Tx The physical properties of matter in the vicinity of quantum critical point (QCP) has been intensively studied for the last two decades. A relation between QCP and unconventional superconductivity, as well as other unusual properties of the electronic system near QCP have attracted much attention, although this complex topic is far from being well understood. Measurements of the thermoelectric effects, which are particularly sensitive to distribution of the density of the electronic states and variation of the relaxation time around the Fermi surface, turn out to be an effective method to detect departures from the Landau description of metals [1][2][3][4][5]. However, an interpretation of these anomalies is not straightforward, since there exist a wide variety of overlapping to some extent models that attempt to explain the unusual thermoelectric behavior. For instance, one can mention here the models of d-wave-(dDW) , spin-(SDW), charge-(CDW), and unconventional-(UDW) density-waves [6,7], magnetic-field-induced chiral order [8], superconducting vortices (or vortex-like excitations) [9], superconducting fluctuations [10], current vertex correction [11]. Even though, studies on temperature and/or magnetic field variations of the Nernst coefficient and the thermoelectric power have been recognized as very helpful tools in distinguishing between possible types of quantum criticality [12][13][14].In this Letter we investigate the transport properties of the Ce 2 PdIn 8 heavy-fermion (HF) compound that exhibits unconventional superconductivity below T c = 0.7 K [15]. We focus on the thermoelectric phenomena which appear to be highly anomalous in the low temperature region. Both the Nernst effect and the thermoelectric power show below T ≈ 7 K features that can be attributed to presence of the quantum critical point.High-quality polycrystalline sample of Ce 2 PdIn 8 was prepared and characterized as described in Ref. [16]. The resistivity was measured using the four-probe technique with 25 µm gold wires attached to the bar-shaped sample with two component silver epoxy (EPO-TEK H20E). For the Hall coefficient measurement, the sample was mounted on a rotatable probe and continuously turned by 180 degree (face down and up) in a magnetic field (B) of 12.5 T to effectively reverse the field anti-symmetrical signal. During the thermoelectric power and Nernst coefficient measurements, the sample was clamped between two phosphor bronze blocks,...

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The thermoelectric power of AlMn alloys

Cited by 31 publications

References 28 publications

Scaling behavior of temperature-dependent thermopower inCeAu2Si2under pressure

Scaling behavior of temperature-dependent thermopower inCeAu2Si2under pressure

From Classical Chaos to Decoherence in Robertson–walker Cosmology

Quantum criticality in Ce2PdIn8: A thermoelectric study

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