Metamagnetic Behavior of the Heavy-Fermion Compound CeNi2Ge2

Fukuhara, Tadashi; Maezawa, K.; Ohkuni, Hitoshi; Sakurai, J.; Sato, Hideyuki; Azuma, Haruyoshi; Sugiyama, Kiyohiro; Ōnuki, Yoshichika; Kindo, Koichi

doi:10.1143/jpsj.65.1559

Cited by 47 publications

(35 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, various theoretical scenarios exist to explain the observed behavior of the systems close to QCP, and they are classified into two major categories: (1) local QCP, where T K → 0 at QCP [2][3][4] and (2) spin density wave scenario, where T K remains finite at QCP [5,6]. Above the QCP, a very strong HF character will eventually reduce the T K , and these systems exhibit non-Fermi-liquid (NFL) properties [7][8][9]. * Corresponding author: devashibhai.adroja@stfc.ac.uk Cerium-based HF intermetallic compounds with the general formula CeTX 3 (1-1-3 stoichiometry, with T = transition metals and X = Si, Ge, and Al), have recently attracted considerable experimental and theoretical interest [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

View full text Add to dashboard Cite

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 .

show abstract

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

View full text Add to dashboard Cite

show abstract

“…As shown in Fig. 7, an upturn is seen below 10 K in both field directions, [13] and was at first suspected to be a magnetic impurity contribution. Although Steglich et al pointed out the possible relevance of the upturn to the NFL behavior in C, [4] conclusive evidence has not yet been provided.…”

mentioning

confidence: 80%

“…A metamagneticlike anomaly observed at 42 T in the magnetization curve and a broad maximum in χ for B//c-axis are regarded as evidence of antiferromagnetic correlation. [13] In this letter, we report precise measurements of specific heat as functions of both temperature and magnetic field on a single crystal CeNi 2 Ge 2 to investigate the low-energy excitations which should be related to the NFL behaviors.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Specific Heat Study of Non-Fermi Liquid Behavior in CeNi₂Ge₂: Anomalous Peak in Quasi-Particle Density-of-States

et al. 1997

View full text Add to dashboard Cite

To investigate the non-Fermi liquid (NFL) behavior in a nonalloyed system CeNi2Ge2, we have measured the temperature and field dependences of the specific heat C on a CeNi2Ge2 single crystal. The distinctive temperature dependence of C/T (∼ α − β √ T ) is destroyed in almost the same manner for both field directions of B//c-axis and B//a-axis. The overall behavior of C(T, B) and the low-temperature upturn in χ(T ) can be reproduced, assuming an anomalous peak of the quasi-particle-band density-of-states (DOS) at the Fermi energy possessing √ ǫ energy dependence. Absence of residual entropy around T = 0 K in B ∼ 0 T has been confirmed by the magnetocaloric effect measurements, which are consistent with the present model. The present model can also be applied to the NFL behavior in CeCu5.9Au0.1 using a ln(ǫ)-dependent peak in the DOS. Possible origins of the peak in the DOS are discussed.

show abstract

“…It exhibits a metamagnetic anomaly at 300 kOe [10] and is also believed to be close to a quantum critical point. This behavior is reminiscent of other 4f-electron systems: CeRu 2 Si 2 [11], CeNi 2 Ge 2 [12] and CeCu 6 [13,14]. In addition to metamagnetic anomalies, deviations from ordinary FL behavior occur under certain circumstances [15][16][17] in these materials.…”

mentioning

confidence: 94%

Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion systemCeFe2Ge2

Bosse

Pan

et al. 2016

Phys. Rev. B

View full text Add to dashboard Cite

We present THz range optical conductivity data of a thin film of the near quantum critical heavy fermion compound CeFe2Ge2. Our complex conductivity measurements find a deviation from conventional Drude-like transport in a temperature range previously reported to exhibit unconventional behavior. We calculate the frequency dependent effective mass and scattering rate using an extended Drude model analysis. We find the inelastic scattering rate can be described by a temperature dependent power-law ω n(T ) where n(T ) approaches ∼ 1.0 ± 0.2 at 1.5 K. This is compared to the ρ ∼ T 1.5 behavior claimed in dc resistivity data and the ρ ∼ T 2 expected from Fermi-liquid theory. In addition to a low temperature mass renormalization, we find an anomalous mass renormalization that persists to high temperature. We attribute this to a Hund's coupling in the Fe states in a manner similar to that recently proposed in the ferro-pnictides. CeFe2Ge2 appears to be a very interesting system where one may study the interplay between the usual 4f lattice Kondo effect and this Hund's enhanced Kondo effect in the 3d states.

show abstract

Metamagnetic Behavior of the Heavy-Fermion Compound CeNi₂Ge₂

Cited by 47 publications

References 20 publications

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

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

Specific Heat Study of Non-Fermi Liquid Behavior in CeNi₂Ge₂: Anomalous Peak in Quasi-Particle Density-of-States

Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion systemCeFe2Ge2

Contact Info

Product

Resources

About

Metamagnetic Behavior of the Heavy-Fermion Compound CeNi2Ge2

Cited by 47 publications

References 20 publications

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

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

Specific Heat Study of Non-Fermi Liquid Behavior in CeNi2Ge2: Anomalous Peak in Quasi-Particle Density-of-States

Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion systemCeFe2Ge2

Contact Info

Product

Resources

About

Metamagnetic Behavior of the Heavy-Fermion Compound CeNi₂Ge₂

Specific Heat Study of Non-Fermi Liquid Behavior in CeNi₂Ge₂: Anomalous Peak in Quasi-Particle Density-of-States