Low-temperature order in the heavy-fermion compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeCu</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Pollack, Lois; Hoch, M.; Choi, Jin; Smith, Eric N.; Parpia, J. M.; Hawthorne, Dean L.; Geller, Drew; Lee, D.M.; Richardson, Robert C.; Hinks, D. G.; Bücher, E.

doi:10.1103/physrevb.52.r15707

Cited by 24 publications

(6 citation statements)

References 2 publications

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“…This would indicate that for both x = 0.2, 0.3 and x = 0.5, 1.0, Q is close to spanning the distance between sections of the Fermi surface with opposite Fermi velocities (Q ∼ 1.8k F − 2k F ). A fit of the results for δρ (3) (13) to the data is not easy due to the unknown background and the additional isotropic contribution from ρ (1) and ρ (2) . We find roughly for the ratio ∆/ǫ F ≈ 0.1(T N /T K )(M Q (T )/M Q (0)).…”

Section: Interplay Of Magnetic Order and Transportmentioning

confidence: 99%

“…Heavy-fermion systems exhibit a fascinating interplay of magnetically ordered and non-magnetic groundstates and -in some systems -superconductivity [1]. It has been known for a decade that the heavy-fermion compound CeCu 6 which does not show magnetic order down to temperatures T of at least 5 mK [2,3] exhibits long-range antiferromagnetic order when alloyed with Au or Ag [4,5]. From the beginning, this has been explained [6] as arising from the interplay between onsite Kondo screening of the Ce magnetic moments in a crystal-field split 2 F 5/2 doublet groundstate [7] and the RKKY interaction between Ce moments.…”

Section: Introductionmentioning

confidence: 99%

“…Increase of the resistivity ρ(3) due to band structure effects for the model described in Eqn. (4) for TN = 0.2ǫF .…”

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confidence: 99%

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Magnetic order and transport in the heavy-fermion system CeCu Au

et al. 1998

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We report on extensive elastic neutron scattering to determine the wave vector of the magnetic order in CeCu6−xAux single crystals for x > 0.1. For all values of x investigated (0.2, 0.3, 0.5, 1.0) we find long-range incommensurate antiferromagnetic order with an ordering vector Q ≈ (0.625 0 0.275) for x = 0.2, nearly unchanged for x = 0.3, and Q ≈ (0.59 0 0) for x = 0.5, staying roughly the same for x = 1.0. In addition, short-range correlations are observed at x = 0.2, reminiscent of those found previously for x = 0.1. The ordered magnetic moment is found to increase rapidly for small x, and more slowly for the larger x values. The increase of the specific-heat anomaly at the ordering temperature with x is in qualitative accord with this behavior. Finally, data of the electrical resistivity for current flow along the three crystallographic directions are presented, showing a clear signature of the magnetic order. A theoretical interpretation of the interplay of magnetic order and transport in terms of (i) the partial suppression of the Kondo effect by the staggered magnetization and (ii) the anisotropic band structure induced by the staggered field is shown to account well for the data, provided the ordering vector Q is close to 2kF , where kF is a typical Fermi momentum.PACS. 75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena -75.25.+z Spin arrangements in magnetically ordered materials -72.15.Eb Electrical and thermal conduction in crystalline metals and alloys

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Section: Interplay Of Magnetic Order and Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic order and transport in the heavy-fermion system CeCu Au

et al. 1998

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“…7 In fact only CeCu 6 does not seem to present some kind of static ordering ͑magnetic or superconducting͒ at low temperature. 16 With this work we add a second compound in the list of Ce intermetallics with a nonmagnetic ground state at low temperature. We notice that the Kondo temperature in CeRu 2 Si 2 is three times smaller than in CePt 2 Si 2 , and that the former compound presents a SR magnetic signature starting at ϳ 2 K, 7 while the latter does not display this signature even at 0.06 K. In this respect, we mention here the discovery of a magnetic phase transition at ϳ 40 K in CeRu 2 , 14 an intermetallic with a Kondo temperature of ϳ 1000 K. 17 In conclusion, the temperature dependence in CePt 2 Si 2 of the specific heat and electrical resistivity observed below 4 K seems to indicate that this compound is not a Fermi-liquid system.…”

Section: Figmentioning

confidence: 99%

CePt2Si2: A Kondo lattice compound with no magnetic ordering do

et al. 1997

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We have performed zero-field and longitudinal field muon spin experiments on single crystals of the Kondo lattice compound CePt 2 Si 2 down to 0.06 K. The crystals have been characterized by magnetization and specific heat measurements. We do not detect any electronic magnetic signal. Our result rules out a magnetic phase transition as the origin of the non-Fermi-liquid behavior of the specific heat and electrical resistivity observed at low temperature. ͓S0163-1829͑97͒02206-6͔The Kondo lattice compound CePt 2 Si 2 crystallizes in the CaBe 2 Ge 2 -type tetragonal structure ͑space group P4/nmm).1 Its Kondo temperature as determined by specific heat is T K Ӎ 70 K.2 At low temperature, its specific heat, electrical resistivity, and magnetic susceptibility display nonFermi-liquid behavior.2,3 Whereas the thermal behavior of the specific heat C and electrical resistivity follow the predictions for a Fermi-liquid system in the range 4-10 K, at low temperature they strongly deviate from the expected behavior. The Sommerfeld ratio C/T increases steeply as the temperature T decreases and concomitantly has an approximate linear temperature dependence.2 It has been argued that a collapse of the magnetic susceptibility in the c plane occurs below 4 K, although this conclusion has been reached after applying a large correction to the measured susceptibility.3 This correction was supposed to take into account an impurity contribution to the susceptibility. The low temperature dependence of the Sommerfeld ratio, resistivity, and susceptibility may reflect a low temperature magnetic phase transition. A more exciting possibility is that CePt 2 Si 2 is an example of a non-Fermi-liquid system. [4][5][6] If CePt 2 Si 2 has a magnetic phase transition at low temperature, this phase is certainly characterized by small magnetic moments since otherwise it would have been already detected. The most efficient method to unravel such a phase transition is to perform muon spin relaxation (SR͒ experiments.7 Here we report such experiments which show that CePt 2 Si 2 does not display any signature of static electronic magnetism. This is in contrast to most strongly correlated electron compounds for which SR experiments have detected static magnetism. 7CePt 2 Si 2 bulk materials have been prepared by direct combination of the high quality elements ͑Ce : 4N, Pt : 4 N, and Si : 6N5͒. The starting elements ͑for a total weight of nearly 10 g͒ were melted in a water-cooled copper crucible heated with a high frequency generator under a purified argon atmosphere. To improve homogeneity, the bulks were turned over and remelted several times. The weight loss is negligible using this way to prepare silicides. The material was then introduced in a triarc furnace under inert gas, equipped with a Czochralski puller.8 Two single crystals ͑the c axis was either along or perpendicular to the pulling axis͒ were grown from the same bulk starting composition using the same seed. The single crystals were checked by conventional x-ray powder diffraction and their ...

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“…In order to avoid confusion, we always use the orthorhombic notation for the direction of the lattice vectors. This is backed by NQR measurements which likewise hint at (possibly nuclear) magnetic order [135]. The measurements of the specific heat C were extended down to 10 mK and of the magnetic susceptibflity % to even below 1 mK [134].…”

Section: Quantum-critical Behavior In Heavy-fermion Systemsmentioning

confidence: 86%