Tuning ground state degeneracy and quantum criticality in Ce1−xLaxTiGe

Sereni, J. G.; Berisso, M. Gómez; Canales, N. Caroca; Deppe, M.; Geibel, C.

doi:10.1002/pssb.200983029

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…This comparison includes the well known CeCu 6−x Au x [27] and CeCu 6−x Ag x [65] Ce-lattices. Also the diluted (Ce 0.1 La 0.9 )TiGe [66] is included to confirm that this limit is related to thermodynamic properties independently of a lattice configuration. Other Ce diluted systems, like (Ce 1−x La x )Pt 3 Si [67], also exhibits similar high values for 0.8 ≤ x ≤ 0.95.…”

Section: Thermodynamic Implications Of the T → 0 Physics A Third Law ...mentioning

confidence: 95%

“…0. In Figure 11 we have collected the low-temperature S m (T ) [73] is included to confirm that this limit is related to thermodynamic properties independently of lattice configuration. Other Ce diluted systems, like (Ce 1Àx La x )Pt 3 Si [77], also exhibit similar high values for 0.8 x 0.95.…”

Section: Thermal Expansionmentioning

confidence: 98%

“…0 in real systems. (a) CePd 3 B [71], CeCu 4 Al[72], CeCu 6Àx Au x[28], (Ce 1Ày La y )TiGe[73] and CeAg 6Àz Au z[74]. Desgr-Schotte indicates the entropy value (2/3R ln 2) at which the minimum value of T min K is empirically evaluated according to that model (see, for example,[75]).…”

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confidence: 99%

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Thermodynamic analysis of the quantum critical behavior of Ce-lattice compounds

Sereni

2013

Philosophical Magazine

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A systematic analysis of low-temperature magnetic phase diagrams of Ce compounds is performed in order to recognize the thermodynamic conditions to be fulfilled by those systems to reach a quantum critical regime or, alternatively, to identify other kinds of low-temperature behavior. Based on specific heat (C m ) and entropy results, three different types of phase diagrams are recognized: (i) with the entropy involved in the ordered phase (S MO ) decreasing proportionally to the ordering temperature (T MO ); (ii) those showing a transference of degrees of freedom from the ordered phase to a non-magnetic component, with their C m (T MO ) jumps (DC m ) vanishing at finite temperature; and (iii) those ending at a critical point at finite temperature because their DC m do not decrease sufficiently with T MO , producing an entropy accumulation at low temperature.Only those systems belonging to the first case, i.e. with S MO ! 0 as T MO ! 0, can be regarded as candidates for quantum critical behavior. Their magnetic phase boundaries deviate from the classical negative curvature below T % 2.5 K, denouncing monotonic misleading extrapolations down to T ¼ 0. Different characteristic concentrations are recognized and analyzed for Ce-ligand alloyed systems. In particular, a pre-critical region is identified where the nature of the magnetic transition undergoes significant modifications, with its @C m /@T discontinuity strongly affected by the magnetic field and showing an increasing remnant entropy at T ! 0. Physical constraints arising from the third law at T ! 0 are discussed and recognized from experimental results.

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Section: Thermodynamic Implications Of the T → 0 Physics A Third Law ...mentioning

confidence: 95%

Section: Thermal Expansionmentioning

confidence: 98%

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Thermodynamic analysis of the quantum critical behavior of Ce-lattice compounds

Sereni

2013

Philosophical Magazine

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“…Au [17] and CeCu Ag [18] (that order magnetically), diluted (Ce La TiGe [15] and CeNi Ge [9] as representative of a compound. As it can be seen, experimental results suggest a sort of upper (or envelope) entropy curve for GS systems which is qualitatively represented by the dependence of CePd B…”

Section: B Entropymentioning

confidence: 99%

Thermodynamic Behavior of Ce Compounds Close to a $T \to 0$ Critical Point

2013

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There is a reduced group of Ce very heavy Fermions (VHF) which do not order magnetically down to at least mK because they are very close to a critical point. These compounds are at the top of the specific heat values because they collect very high density of low energy excitations. From the analysis of and entropy dependencies performed on selected CePd M ternaries (where and Be) a quantitative evaluation of an upper limit for the density of excitations can be proposed. These observations exclude any evidence of divergency as in agreement with thermodynamic laws. A comparison with selected Yb-base VHF supports these features.

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Cerium intermetallics CeTX– review III

Pöttgen

Janka

Chevalier

2016

Zeitschrift Für Naturforschung B

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The structure–property relationships of CeTX intermetallics with structures other than the ZrNiAl and TiNiSi type are systematically reviewed. These CeTX phases form with electron-poor and electron-rich transition metals (T) and X = Mg, Zn, Cd, Hg, Al, Ga, In, Tl, Si, Ge, Sn, Pb, P, As, Sb, and Bi. The review focusses on the crystal chemistry, the chemical bonding peculiarities, and the magnetic and transport properties. Furthermore 119Sn Mössbauer spectroscopic data, high-pressure studies, hydrogenation reactions and the formation of solid solutions are reviewed. This paper is the third of a series of four reviews on equiatomic intermetallic cerium compounds [Part I: R. Pöttgen, B. Chevalier, Z. Naturforsch. 2015, 70b, 289; Part II: R. Pöttgen, B. Chevalier, Z. Naturforsch. 2015, 70b, 695].

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Tuning ground state degeneracy and quantum criticality in Ce_1−xLa_xTiGe

Cited by 4 publications

References 6 publications

Thermodynamic analysis of the quantum critical behavior of Ce-lattice compounds

Thermodynamic analysis of the quantum critical behavior of Ce-lattice compounds

Thermodynamic Behavior of Ce Compounds Close to a $T \to 0$ Critical Point

Cerium intermetallics CeTX– review III

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