32 research outputs found
Anomalous magnetotransport in the heavy-fermion superconductor Ce2PdIn8
The normal state behavior in the heavy-fermion superconductor Ce2PdIn8 has
been probed by means of Hall coefficient (RH) and transverse magnetoresistivity
(MR) measurements. The results indicate the predominance of contributions from
antiferromagnetic spin fluctuations at low temperatures. Anomalous
non-Fermi-liquid-like features, observed below 8 K in both RH(T) and MR(T), are
related to underlying quantum critical point, evidenced before in the specific
heat and the electrical resistivity data. The magnetotransport in Ce2PdIn8 is
shown to exhibit specific types of scaling that may appear universal for
similar systems at the verge of magnetic instability.Comment: Accepted as a Rapid Communication in Physical Review
Doping dependence of the Nernst effect in Eu(Fe1-xCox)2As2 - departure from Dirac fermions physics
We report a systematic study of the transport properties in the series of
Eu(Fe1-xCox)2As2 single crystals with x = 0, 0.15, 0.20 and 0.30.
Spin-density-wave order is observed in the undoped and the least doped samples
(x = 0, 0.15), while for x = 0.15 and 0.20 Eu(Fe1-xCox)2As2 becomes a
superconductor. We found the properties of the parent EuFe2As2 compound well
described by the Dirac fermions model, whereas cobalt doping caused an
evolution of the system toward a regular metallic state. The antiferromagnetic
ordering of the Eu2+ ions at T_N ~ 20 K has only minor influence on the
measured quantities.Comment: 5 pages, 5 figures; ver.3: the sign convention for the Nernst
coefficient is change
Quantum criticality in Ce2PdIn8: thermoelectric study
We report the Nernst effect (v) and thermoelectric power (S) data for the
Ce2PdIn8 heavy-fermion compound. Both S and v 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 v/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.Comment: 5 pages, 3 figure
Thermoelectric quantum oscillations in ZrSiS.
Topological semimetals are systems in which conduction and valence bands cross each other and the crossings are protected by topological constraints. These materials provide intriguing tests for fundamental theories, while their unique physical properties promise a wide range of possible applications in low-power spintronics, optoelectronics, quantum computing and green energy harvesting. Here we report our study of the thermoelectric power of single-crystalline ZrSiS that is believed to be a topological nodal-line semimetal. We show that the thermoelectric power is an extremely sensitive probe of multiple quantum oscillations that are visible in ZrSiS at temperatures as high as 100 K. Two of these oscillations are shown to arise from three- and two-dimensional electronic bands, each with linear dispersion and the additional Berry phase predicted theoretically for materials with non-trivial topology. Our work not only provides further information on ZrSiS but also suggests a different route for studying other topological semimetals