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Author Encina, S.; Pedrazzini, P.
Title Low Temperature Thermoelectric Power of Ce(Pd{1-x}Cux)2Si2 Type Journal Article
Year 2015 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.
Volume 179 Issue 1-2 Pages 21-27
Keywords Heavy fermions; Antiferromagnetic transition; Thermopower; Electrical resistivity
Abstract We present the thermoelectric power S(T) of the Ce(Pd 1−x Cu x ) 2 Si 2 alloy for temperatures \(1.5\,\mathrm{K} K. We observe three characteristic features across the \(0 substitution range: two positive maxima and a negative minimum, that are typical for Ce compounds that display, or lie close to, magnetism. Our analysis of the data shows that the high- T maximum is related to the Kondo effect on excited crystal-field levels, but that the low- T one cannot be simply associated with the Kondo scale, TK . We speculate that disorder induced by alloying can be at the origin of this discrepancy and can also be responsible for the low S(T) measured at low temperatures in the \(0.2 concentration range. We have extended electrical resistivity measurements on Ce(PdCu)Si 2 ( x=0.5 ) down to T∼40 mK in applied fields as high as 16 T.
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Publisher Springer US Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN 0022-2291 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 706
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Author Frank, V.L.P.
Title Measurements of superconducting critical currents with an Apple II plus microcomputer Type Journal Article
Year 1985 Publication Instruments & Computers Abbreviated Journal Int. Inst. & Comp.
Volume 3 Issue Pages 4-7
Keywords Data aquisistion and processing; IEEE-488 interfacing; superconducting properties; electrical resistivity measurements
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Call Number BT @ pedrazp @ Serial 810
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Author Guimpel, J.; de la Cruz, F.
Title Electrical resistivity of amorphous Zr70Cu30 and the Kondo like model Type Journal Article
Year 1982 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 44 Issue 7 Pages 1045-1046
Keywords Zr70Cu30; superconductivity; electrical resistivity; ZIRCONIUM COPPER ALLOYS
Abstract Electrical resistivity measurements of amorphous Zr70Cu30 as a function of the concentrations of two level systems show that a Kondo like theory cannot explain the observed temperature dependence.
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ISSN 0038-1098 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 540
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Author Pedrazzini, P.; Jaccard, D.; Lapertot, G.; Flouquet, J.; Inada, Y.; Kohara, H.; Onuki, Y.
Title Probing the extended non-Fermi liquid regimes of MnSi and Fe Type Journal Article
Year 2006 Publication Physica B – Condensed Matter Abbreviated Journal Physica B
Volume 378-380 Issue Pages 165-166
Keywords electrical resistivity; Fermi liquid; ferromagnetic materials; high-pressure effects; iron; magnetic superconductors; manganese alloys; silicon alloys; strongly correlated electron systems; superconducting transition temperature; superconducting transitions; whiskers; MnSi; Fe
Abstract Recent studies show that the non-Fermi liquid (NFL) behavior of MnSi and Fe spans over an unexpectedly broad pressure range, between the critical pressure p and around 2p. In order to determine the extension of their NFL regions, we analyze the evolution of the resistivity ρ(T)˜A(p)T at higher pressures. We find that in MnSi the n=32 exponent holds below 4.8GPa≈3p, but it increases above that pressure. At 7.2 GPa we observe the low-temperature Fermi liquid exponent n=2 whereas for T>1.5K, n=53. Our measurements in Fe show that the NFL behavior ρ˜T extends at least up to 30.5 GPa, above the entire superconducting (SC) region. In the studied pressure range, the onset of the SC transition reduces by a factor 10 down to Tconset(30.5GPa)=0.23K, while the A—coefficient diminishes monotonically by around 50%.
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Call Number BT @ pedrazp @ Serial 469
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Author Seyfarth, G.; Jaccard, D.; Pedrazzini, P.; Krzton-Maziopa, A.; Pomjakushina, E.; Conder, K.; Shermadini, Z.
Title Pressure cycle of superconducting Cs0.8Fe2Se2 : A transport study Type Journal Article
Year 2011 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 151 Issue 10 Pages 747-750
Keywords Fe; Se; chalcogenides; Superconductivity; High pressure; electrical resistivity
Abstract We report measurements of the temperature and pressure dependence of the electrical resistivity (ρ) of single-crystalline iron-based chalcogenide Cs0.8Fe2Se2. In this material, superconductivity with a transition temperature Tc~30K source develops from a normal state with extremely large resistivity. At ambient pressure, a large “hump” in the resistivity is observed around 200 K. Under pressure, the resistivity decreases by two orders of magnitude, concomitant with a sudden Tc suppression around pc~30K. Even at 9 GPa a metallic resistivity state is not recovered, and the ρ(T) “hump” is still detected. A comparison of the data measured upon increasing and decreasing the external pressure leads us to suggest that the superconductivity is not related to this hump.
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Notes Approved no
Call Number BT @ pedrazp @ Serial 604
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