|   | 
Details
   web
Records
Author Giriat, G.; Ren, Z.; Pedrazzini, P.; Jaccard, D.
Title High pressure investigation of superconducting signatures in CeCu2Si2: ac-magnetic susceptibility, ac-heat capacity, resistivity and thermopower Type Journal Article
Year 2015 Publication Solid State Communications Abbreviated Journal Solid State Commun.
Volume 209–210 Issue Pages 55-58
Keywords CeCu2Si2; Superconductivity; Magnetic susceptibility; High pressure
Abstract Taking advantage of a novel multiprobe setup we have measured, on a unique sample, the ac-magnetic susceptibility, the resistivity, the ac-specific heat and the thermopower of the superconductor heavy fermion CeCu2Si2 under pressure up to 5.1 GPa. At the superconducting transition temperature Tc, the Meissner signal corresponds to that expected for the sample volume and coincides with the specific heat jump and the resistive transition completion temperatures. Differing from previous observations, here the susceptibility measurements did not reveal any anomaly in the vicinity of the resistive transition onset.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0038-1098 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 720
Permanent link to this record
 

 
Author Pedrazzini, P.; Jaccard, D.
Title The critical pressure of chromium Type Journal Article
Year 2008 Publication Physica B: Condensed Matter Abbreviated Journal Physica B
Volume 403 Issue 5-9 Pages 1222-1224
Keywords Chromium; Quantum phase transitions; High pressure; Resistivity
Abstract We present first results of high-pressure resistivity measurements on pure chromium. Two pieces of evidence show that spin density wave magnetism is suppressed at a critical pressure pc?10GPa, namely, the evolution of the ordering temperature TN(p) and the rapid decrease of the residual resistivity close to pc. Our discussion profits from the comparison between pressurized-Cr and the Cr1-xVx alloy, for which a large amount of information on its electronic properties is available.
Address
Corporate Author DPMC, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211 Geneva, Switzerland Thesis
Publisher Elsevier Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0921-4526 ISBN Medium
Area Expedition Conference International Conference on Strongly Correlated Electron Systems
Notes Approved no
Call Number BT @ pedrazp @ Serial 429
Permanent link to this record
 

 
Author Pedrazzini, P.; Jaccard, D.; Deppe, M.; Geibel, C.; Sereni, J.G.
Title Multiprobe high-pressure experiments in CePd0.6Rh0.4 and CePd3 Type Journal Article
Year 2009 Publication Physica B: Condensed Matter Abbreviated Journal Physica B
Volume 404 Issue 19 Pages 2898-2903
Keywords Ce compounds; Ferromagnetism; Quantum phase transition; High pressure; Resistivity; Seebeck coefficient; Specific heat
Abstract Results of recent multiprobe high-pressure experiments on ferromagnetic CePd0.6Rh0.4 and intermediate-valent CePd3 are presented. Simultaneous resistivity (ρ), thermopower (S), and ac heat capacity measurements show that the long-range ferromagnetic state of CePd0.6Rh0.4 vanishes in the proximity of a sharp valence-crossover pressure , i.e. before reaching a quantum critical point. However, a magnetic signal that is progressively suppressed is still detected at higher pressures. For CePd3, the results of simultaneous ρ(T,p) and S(T,p) measurements up to and down to the mK temperature range show a surprisingly weak pressure dependence.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0921-4526 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ jsereni @ Serial 561
Permanent link to this record
 

 
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.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 604
Permanent link to this record