Unstable Shastry-Sutherland phase in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ce</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Pd</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mtext>Sn</mml:mtext></mml:mrow></mml:math>

Sereni, J. G.; Berisso, M. Gómez; Braghta, A.; Schmerber, G.; Kappler, J.P.

doi:10.1103/physrevb.80.024428

Cited by 22 publications

(65 citation statements)

References 24 publications

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“…That phase is observed within a limited range of temperature, between T M = 4.8 > T > T C = 2.1 K, having as the upper limit a correlated paramagnetic phase and a ferromagnetic FM one as ground state GS. This exotic phase builds up from FM-dimers formed by Ce nearest-neighbor atoms, and shows the onset of magnetic correlations at T ≤ 20 K. An antiferromagnetic AF exchange interaction between those dimers drives the formation of the ShSu phase, realized in this compound as a quasi 2D square lattice of effective spin S ef f = 1 below T M = 4.8 K [8].…”

Section: Introductionmentioning

confidence: 93%

Suppression of the Shastry-Sutherland phase inCe2Pd2Snat a field-induced critical point

Sereni

Berisso²,

Schmerber³

et al. 2010

Phys. Rev. B

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The magnetic phase diagram of Ce2Pd2Sn is investigated through the field dependence of thermal, transport and magnetic measurements performed at low temperature. The upper transition, TM = 4.8 K is practically not affected by magnetic field up to B = 1 T, whereas the lower one TC (B) rapidly increases from 2.1 K joining TM in a critical point at Tcr = (4.2 ± 0.3)K for Bcr = (0.12 ± 0.03) T. At that point the intermediate phase, previously described as an unstable Shastry-Sutherland phase, is suppressed. A detailed analysis around the critical point reveals a structure in the maximum of the ∂M/∂B(B) derivative which could be related to the formation of a novel phase in that critical region.

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Section: Introductionmentioning

confidence: 93%

Suppression of the Shastry-Sutherland phase inCe2Pd2Snat a field-induced critical point

Sereni

Berisso²,

Schmerber³

et al. 2010

Phys. Rev. B

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“…Below T * , the C m (T ) dependence is properly fitted according to an anisotropic FM relation dispersion like the observed in Ce 2 Pd 2 Sn [10]:…”

Section: Discussionmentioning

confidence: 99%

“…One can see that for the latter compound the 'per Ce atom' entropy at T = T M is S mag = 0.8RLn2, which coincides with the molar entropy of RLn3. Like for stoichiometric Ce 2 Pd 2 Sn [10], included in the figure as reference, the formation of FM dimers is inferred. The remaining entropy is collected above the transition since the onset of magnetic correlations occurs at T ≤ 20 K as indicated by the C m (T > T M ) tail in Fig.…”

Section: A Proving Dimers Formationmentioning

confidence: 99%

“…The χ ac (T ) maximum at T = 3.6 K coincides with the corresponding T M value, but only a weak shoulder is detected at T = 1.5 K in coincidence with C m (T )/T . This temperature dependence has to be compared with that of Ce 2 Pd 2 Sn [10] shown in the inset. There, the first order character of the lower transition is clearly evidenced by the thermal hysteresis around T C .…”

Section: Thermal Propertiesmentioning

confidence: 99%

“…[10] we have evaluated the magnetic entropy gain S mag (T ) from the measured specific heat as S mag = C m /T dT , and included those results in Fig. 7 for different P d concentrations, including one Ce-rich FM alloy.…”

Section: A Proving Dimers Formationmentioning

confidence: 99%

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Electron concentration effects on the Shastry-Sutherland phase stability in Ce2−xPd2+yIn<

et al. 2011

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The stability of a Shastry-Sutherland ShSu phase as a function of electron concentration is investigated through the field dependence of thermal and magnetic properties of the solid solution Ce2−xPd2+yIn1−z in the antiferromagnetic branch. In these alloys the electronic (holes) variation is realized by increasing P d concentration. The AF transition TM decreases from 3.5 K to 2.8 K as P d concentration increases from y = 0.2 to y = 0.4. By applying magnetic field, the ShSu phase is suppressed once the field induced ferromagnetic polarization takes over at a critical field Bcr which increases with P d content. A detailed analysis around the critical point reveals a structure in the maximum of the ∂M/∂B derivative, which is related with incipient steps in the magnetization M (B) as predicted by the theory for the ShSu lattice. The crossing of M (B) isotherms, observed in ShSu prototype compounds, is also analyzed. The effect of In substitution by P d is interpreted as an increase of the number of 'holes' in the conduction band and results in a unique parameter able to describe the variation of the magnetic properties along the studied range of concentration.

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Yb4LiGe4 – A Yb mixed valent Zintl phase with strong electronic correlations

Peter

Disseler

Svensson

et al. 2012

Journal of Alloys and Compounds

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a b s t r a c tSingle-phase samples of Yb 4 LiGe 4 and Yb 5 Ge 4 were synthesized using high frequency (HF) heat treatment. Yb 4 LiGe 4 crystallizes in orthorhombic space group Pnma with the Gd 5 Si 4 type of crystal structure and lattice parameters a = 7.0828(3)Å, b = 14.6415(7)Å, and c = 7.6279(4)Å. One Yb position in Yb 5 Ge 4 is substituted by the lithium atom and causes a distortion of the germanium tetragons in Yb 4 LiGe 4 . Investigation of the electronic state of Yb via magnetic susceptibility and X-ray absorption near-edge spectroscopy (XANES) revealed a presence of two electronic states of ytterbium, 4f 13 and 4f 14 (mixed valence), in Yb 5 Ge 4 and Yb 4 LiGe 4 . Studies of the temperature dependence of the electrical resistivity, magnetization, 7 Li spin-lattice relaxation rate and the specific heat indicate that strong electronic correlations are present in Yb 4 LiGe 4 , and below approximately 50 K there is a competition between ferromagnetic and antiferromagnetic correlations. Magnetic ordering in Yb 4 LiGe 4 , if present, occurs below the reported antiferromagnetic transition temperature of 1.7 K for Yb 5 Ge 4 .

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Unstable Shastry-Sutherland phase inCe2Pd2Sn

Cited by 22 publications

References 24 publications

Suppression of the Shastry-Sutherland phase inCe2Pd2Snat a field-induced critical point

Suppression of the Shastry-Sutherland phase inCe2Pd2Snat a field-induced critical point

Electron concentration effects on the Shastry-Sutherland phase stability in Ce2−xPd2+yIn<

Yb4LiGe4 – A Yb mixed valent Zintl phase with strong electronic correlations

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