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Author (up) Bauer, E.; Galatanu, A.; Rogl, P.; Berisso, M.G.; Pedrazzini, P.; Sereni, J.G.
Title Loss of magnetism in CePd2-xNixAl3 Type Journal Article
Year 2002 Publication PHYSICA B-CONDENSED MATTER Abbreviated Journal
Volume 312 Issue Pages 464-465
Keywords
Abstract Hexagonal CePd2-xNixAl3 exhibits a crossover from a Kondo lattice showing magnetic order at T(N)similar or equal to2.8 K for xless than or equal to0.2 to intermediate valence (IV) for x-->2. Though T-N(x) is weakly affected upon Pd/Ni substitution before vanishing at finite temperature, the Kondo temperature T-K progressively increases. Above xsimilar or equal to0.3 the phase boundary no longer exists and strong spin fluctuations cause pronounced deviations from a Fermi-liquid ground state before the IV regime is established for xgreater than or equal to1. (C) 2002 Elsevier Science B.V. All rights reserved.
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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 ISI:000175871000171 Approved no
Call Number BT @ hernan @ Serial 296
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Author (up) Bauer, E.; Hauser, R.; Galatanu, A.; Lindbaum, A.; Hilscher, G.; Sassik, H.; Kirchmayr, H.; Sereni, J.G.; Rogl, P.
Title New phase boundary between magnetic and non-Fermi-liquid in Ce(Rh1-xRux)(3)B-2, for 0 <= x <= 0.4 Type Journal Article
Year 1998 Publication Journal of Applied Physics Abbreviated Journal J. Appl. Phys.
Volume 83 Issue 11 Pages 6423-6425
Keywords
Abstract A study of the temperature-dependent magnetic susceptibility and electrical resistivity rho(T) (0.5-300 K) on single-phase alloys (CaCu5 type), prepared by argon are melting, reveals a magnetic phase transition with a nonmonotonous decrease of the ordering temperature from T-c = 115 K for x = 0 to T-c approximate to 0 for x = 0.40. A kink in the susceptibility at about 70 K indicates that ferromagnetism (at x < 0.1) transforms to a complex magnetic order for 0.125 less than or equal to x less than or equal to 0.35. Above that concentration rho(T) = rho(0) + AT(n) changes from n approximate to 2 to n approximate to 1.5, a characteristic for non-Fermi-liquid behavior. Under pressure T-c stays almost constant for x = 0.125 but dT(c)/dp grows with increasing Ru content. On the contrary, applied fields up to 12 T do not affect T-c. Low-temperature specific heat and ac susceptibility for x = 0.40 confirm the absence of long-range magnetic order down to 0.5 K, For x = 0.35 C-p/T = 62 mJ/mol K at 1.5 K, a value which is three times larger than that of CeRh3B2. (C) 1998 American Insitute of Physics. [S0021-8979(98)46511-3].
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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 0021-8979 ISBN Medium
Area Expedition Conference
Notes ISI:000077795500066 Approved no
Call Number BT @ hernan @ Serial 84
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Author (up) Bauer, E.; Hauser, R.; Galatanu, A.; Michor, H.; Hilscher, G.; Sereni, J.; Berisso, M.G.; Pedrazzini, P.; Galli, M.; Marabelli, F.; Bonville, P.
Title Non-Fermi-liquid behavior of YbCu5-xAlx Type Journal Article
Year 1999 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 60 Issue 2 Pages 1238-1246
Keywords
Abstract A valency change in YbCu5-xAlx from nu approximate to 2.2(x=0) to nu=3(x=2) causes a magnetic instability near a critical concentration x(cr)approximate to 1.5 Alloys in the vicinity of x(cr) exhibit typical non-Fermi-liquid properties like a negative logarithmic contribution to the specific heat or substantial deviations of the electrical resistivity from a T-2 behavior. Both pressure and alloying in this series bring about a strong reduction of the Kondo temperature T-K; the crystal-held interaction and the interatomic exchange gain therefore importance and magnetic order becomes possible beyond x(cr).
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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 0163-1829 ISBN Medium
Area Expedition Conference
Notes ISI:000081563800070 Approved no
Call Number BT @ hernan @ Serial 301
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Author (up) Bauer, E.; Hauser, R.; Michor, H.; Hilscher, G.; Galatanu, A.; Galli, M.; Sereni, J.G.; Bonville, P.
Title Evolution of a non-Fermi-liquid state in YbCu5-xAlx Type Journal Article
Year 1999 Publication Physica B Abbreviated Journal
Volume 259-261 Issue Pages 426-428
Keywords
Abstract The growing valency of the Yb ion, when Cu is substituted by Al in YbCu5 – xAlx, causes a magnetic instability at a critical concentration x(cr) approximate to 1.5. Alloys in the vicinity of x(cr) exhibit typical non-Fermi-liquid properties. (C) 1999 Elsevier Science B.V. All rights reserved.
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 ISI:000079315700188 Approved no
Call Number BT @ hernan @ Serial 83
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Author (up) Berger, S.; Galatanu, A.; Hilscher, G.; Michor, H.; Paul, C.; Bauer, E.; Rogl, P.; Gomez-Berisso, M.; Pedrazzini, P.; Sereni, J.G.; Kappler, J.P.; Rogalev, A.; Matar, S.; Weill, F.; Chevalier, B.; Etourneau, J.
Title Experimental study of physical properties in the complex magnetic phase diagram of Ce(Rh1-xRux)(3)B-2 Type Journal Article
Year 2001 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 64 Issue 13 Pages 134404
Keywords
Abstract We report on a series of structural, magnetic, and thermodynamic measurements, a study of transport properties and x-ray absorption edge spectroscopy on Ce(Rh1-xRux)(3)B-2. These investigations evidence that in addition to the already established ferromagnetic range for x less than or equal to0.06, a complex antiferromagnetic structure exists for concentrations 0.1 less than or equal tox less than or equal to0.35. The behavior in the latter regime is dominated by an extraordinary strong intersite coupling; however, the magnetic moments involved appear to be very small. At the phase boundary to the paramagnetic regime (x approximate to0.4), significant deviations from a Fermi-liquid behavior occur.
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 0163-1829 ISBN Medium
Area Expedition Conference
Notes ISI:000171426700059 Approved no
Call Number BT @ hernan @ Serial 74
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Author (up) Sereni, J.G.; Pedrazzini, P.; Bauer, E.; Galatanu, A.; Aoki, Y.; Sato, H.
Title Detailed study of the CePd2-xNixAl3 magnetic phase diagram around its critical concentration Type Journal Article
Year 2006 Publication Journal of Physics: Condensed Matter Abbreviated Journal J. Phys.: Cond. Matter
Volume 18 Issue 15 Pages 3789-3802
Keywords
Abstract Thermal, magnetic and transport measurements on CePd2-xNixAl3 alloys within the 0 <= x <= 1 range are reported, including applied pressure (p) and magnetic field on some selected samples. The low temperature results indicate that long range antiferromagnetic order is robust up to x = 0.2, whereas between 0.25 and 0.5 magnetic fluctuations give rise to non-Fermiliquid (NFL) behaviour. In this critical region, the low temperature specific heat can be described as due to two components, the major showing a NFL C-p/T = gamma(0) – gamma(1) root T dependence, while the minor one includes a decreasing fraction of short range order degrees of freedom. The latter is only observed close to the critical point, x(cr) approximate to 0.35. Electrical resistivity (rho) studies performed under pressure for x = 0.5 allow us to investigate the evolution of the NFL state around and beyond x(cr), where the exponent of rho proportional to T-n increases from n = 1 (for p = 0) up to n = 2 (for p = 12 kbar). This exponent is also observed at normal pressure on the x = 1.0 sample. indicating the onset of the Fermi liquid behaviour. Doping and pressure effects are compared by fitting high temperature resistivity data employing a unique function which allows us to describe the evolution of the characteristic energy of this series along a large range of concentration and pressure.
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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 0953-8984 ISBN Medium
Area Expedition Conference
Notes ISI:000237410400027 Approved no
Call Number BT @ hernan @ Serial 58
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