Vibron Quasibound State in the Noncentrosymmetric Tetragonal Heavy-Fermion Compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>CeCuAl</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Adroja, D. T.; Moral, A. del; Fuente, C. de la; Fraile, Alberto; Goremychkin, E. A.; Taylor, J. W.; Hillier, A. D.; Fernandez-Alonso, Félix

doi:10.1103/physrevlett.108.216402

Cited by 72 publications

(96 citation statements)

References 22 publications

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“…Such CEF-phonon coupling has been detected in CeCuAl 3 , which has a similar crystal structure to CeRhGe 3 , where three CEF excitations from the ground state are clearly observed. 40 The scattering at the highest Q is comparable for CeRhGe 3 and LaRhGe 3 , which indicates similar phonon contributions in these compounds. This can be seen clearly in the 1D cuts made from the 2D color plots at low Q from 0 to 4Å −1 and at high Q from 5 to 9Å −1 (see Fig.…”

Section: High-energy Ins Study To Investigate Cef Excitationsmentioning

confidence: 55%

Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

et al. 2012

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The magnetic ground state of CeRhGe 3 has been investigated using magnetic susceptibility, heat capacity, neutron diffraction, muon spin relaxation (µSR), and inelastic neutron scattering (INS) techniques. Our µSR study clearly reveals the presence of two frequencies below T N2 = 7 K and three frequencies between 7 K and T N1 = 14.5 K, indicating long-range magnetic ordering of the Ce 3+ moment. The temperature dependence of the highest frequency follows a mean-field order parameter. Our powder neutron diffraction study at 1.5 K reveals the presence of magnetic Bragg peaks, indexed by the propagation vector k = (0, 0, 3/4) with the Ce 3+ magnetic moment ∼0.45(9) µ B along the c axis. INS studies at 18 K (i.e., above T N1 ) show the presence of two well-defined crystal-field (CEF) excitations at 7.5 and 18 meV. At 10 and 4.5 K, a very small increase has been observed in the CEF excitation energies. At 100 K, both CEF excitations broaden and a broad quasielastic component has also been observed. Further, the low-energy INS study reveals the presence of a nearly temperature-independent quasielastic linewidth between 16 and 60 K, which indicates a Kondo temperature T K = 12.6(3) K. The presence of well-defined CEF excitations in CeRhGe 3 suggests local moment magnetism and may explain the absence of pressure-induced superconductivity. Analyzing the INS data based on a CEF model, we have evaluated the CEF ground-state wave functions and ground-state moment. The observed small value of the ordered moment along the c axis, deduced from the neutron diffraction data, contrasts with the ab-plane moment direction predicted by the single-ion CEF anisotropy and indicates the presence of two-ion anisotropic magnetic exchange interactions, which govern the direction of the moment.

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Section: High-energy Ins Study To Investigate Cef Excitationsmentioning

confidence: 55%

Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

et al. 2012

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“…Particularly interesting are those systems where strong CEF-phonon (or spin-phonon) coupling exists. Recently, we have investigated the noncentrosymmetric tetragonal CeCuAl 3 compound using inelastic neutron scattering (INS) and found the presence of three excitations in the paramagnetic phase at 1.25, 10, and 20 meV [23]. Based on Kramer's theorem, we cannot expect more than two CEF excitations for Ce 3+ (4f 1 ) in the paramagnetic phase.…”

Section: Introductionmentioning

confidence: 99%

“…Based on Kramer's theorem, we cannot expect more than two CEF excitations for Ce 3+ (4f 1 ) in the paramagnetic phase. The observed three CEF excitations in CeCuAl 3 have been explained based on the CEF-phonon coupling model (called magnetoelastic coupling) [23]. In order to investigate whether or not the CEF-phonon coupling is also present in other members of the noncentrosymmetric compounds with the general formula CeTX 3 , we are currently investigating several compounds of this family using INS [10][11][12]23].…”

Section: Introductionmentioning

confidence: 99%

Muon spin rotation and neutron scattering study of the noncentrosymmetric tetragonal compoundCeAuAl3

et al. 2015

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We have investigated the noncentrosymmetric tetragonal heavy fermion compound CeAuAl 3 using muon spin rotation (μSR), neutron diffraction (ND), and inelastic neutron scattering (INS) measurements. We have also revisited the magnetic, transport, and thermal properties. The magnetic susceptibility reveals an antiferromagnetic transition at 1.1 K with, possibly, another magnetic transition near 0.18 K. The heat capacity shows a sharp λ-type anomaly at 1.1 K in zero field, which broadens and moves to a higher temperature in an applied magnetic field. Our zero-field μSR and ND measurements confirm the existence of a long-range magnetic ground state below 1.2 K. Further, the ND study reveals an incommensurate magnetic order with a magnetic propagation vector k = (0,0,0.52(1)) and a spiral structure of Ce moments coupled ferromagnetically within the ab plane. Our INS study reveals the presence of two well-defined crystal electric field (CEF) excitations at 5.1 and 24.6 meV in the paramagnetic phase of CeAuAl 3 that can be explained on the basis of the CEF theory and the Kramer's theorem for a Ce ion having a 4f 1 electronic state. Furthermore, low energy quasielastic excitations show a Gaussian line shape below 30 K compared to a Lorentzian line shape above 30 K, indicating a slowdown of spin fluctuations below 30 K. We have estimated a Kondo temperature of T K = 3.5 K from the quasielastic linewidth, which is in good agreement with that estimated from the heat capacity. This study also indicates the absence of any CEF-phonon coupling unlike that observed in isostructural CeCuAl 3 The CEF parameters, energy level scheme, and their wave functions obtained from the analysis of INS data explain satisfactorily the single crystal susceptibility in the presence of two-ion anisotropic exchange interaction in CeAuAl 3 .

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“…The vibron state was observed recently also in antiferromagnetically ordered CeCuAl 3 compound [1]. Although numerous studies were done, magnetic ground state of this compound remains unknown.…”

Section: Introductionmentioning

confidence: 91%

“…The powder neutron diraction data shows the ordered BaNiSn 3 -type structure [4]. Subsequently many further papers adopt the BaNiSn 3 structure [1]. On the other hand, some recent studies stated again the BaAl 4 structure [5].…”

Section: Introductionmentioning

confidence: 99%

Structural Phase Transition in CeCuAl_{3} Single Crystal

et al. 2014

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The high temperature properties of CeCuAl3 single crystal were investigated by dierential scanning calorimetry and high-temperature x-ray diraction. The structural phase transition takes place around 300• C. The phase transition changes the structural parameters only, the tetragonal BaNiSn3-type structure is preserved. The signicant changes of lattice parameters and especially atomic fraction coordinates with this transition are discussed with respect to the number of heating/cooling cycles and stability in time. Magnetic properties of as-cast and annealed sample are shown for comparison.

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Vibron Quasibound State in the Noncentrosymmetric Tetragonal Heavy-Fermion CompoundCeCuAl3

Cited by 72 publications

References 22 publications

Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

Muon spin rotation and neutron scattering study of the noncentrosymmetric tetragonal compoundCeAuAl3

Structural Phase Transition in CeCuAl_{3} Single Crystal

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