Third-Order Magnetic Susceptibility and Quadrupolar Order Parameter of Kondo-Lattice Compound Ce3Pd20Ge6

Kitagawa, Jiro; Takeda, Nobuo; Ishikawa, Masayasu; Nakayama, M.; Kimura, Noriaki; Komatsubara, T.

doi:10.1143/jpsj.69.883

Cited by 15 publications

(10 citation statements)

References 20 publications

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“…226, cF112), respectively. The former compound exhibits the coexistence of the Kondo effect and the quadrupolar ordering [1,2,3,4,5,6], and the latter one does a high magnetic refrigeration efficiency [7]. The Th 2 Zn 17 -type (R 3m, No.…”

Section: Introductionmentioning

confidence: 99%

Competition between ferromagnetic and antiferromagnetic states in Al8.5−Fe23Ge12.5+ (0≤x≤3)

Kitagawa

Yakabe

Nakayama

et al. 2020

Journal of Solid State Chemistry

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Polycrystalline Al 7+x Fe 23 Ge 14−x -type orthorhombic Al 8.5−x Fe 23 Ge 12.5+x (0≤x≤3) compounds were studied by X-ray diffraction measurement, metallographic examination, and magnetization and electrical resistivity measurements. The lattice parameters show anisotropic x dependences, reflecting a lower symmetry of rather complex crystal structure. In the x=0 sample, a ferromagnetic (FM) transition occurs at the Curie temperature T C of 255 K, which is systematically reduced with increasing x and disappears at x=2.5 where an

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Section: Introductionmentioning

confidence: 99%

Competition between ferromagnetic and antiferromagnetic states in Al8.5−Fe23Ge12.5+ (0≤x≤3)

Kitagawa

Yakabe

Nakayama

et al. 2020

Journal of Solid State Chemistry

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“…For instance, in the paramagnetic phase of the Kagome system SCGO [26] a large positive value of χ 3 is seen above T c , but it reaches close to zero within 2T c . In many strongly correlated itinerant metamagnets [27,28] in which an order-parameter develops, χ 3 peaks at the ordering temperature, and decreases rapidly as T → 0. Nonlinear susceptibility measurements in such systems typically probe higher order correlations and place strong constraints on the ground state [29,30].…”

Section: B Comparison To Traditional Nonlinear Susceptibility Responsesmentioning

confidence: 99%

Anomalous and Anisotropic Nonlinear Susceptibility in the Proximate Kitaev Magnet $α$-RuCl$_3$

Holleis¹,

Prestigiacomo²,

Fan³

et al. 2021

Preprint

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The leading order nonlinear (NL) susceptibility, χ3, in a paramagnet is negative and diverges as T → 0. This divergence is destroyed when spins correlate and the NL response provides unique insights into magnetic order. Dimensionality, exchange interaction, and preponderance of quantum effects all imprint their signatures in the NL magnetic response. Here, we study the NL susceptibilities in the proximate Kitaev magnet α-RuCl3 which differs from the expected antiferromagnetic behavior. For T < Tc = 7.5 K and field B in the ab-plane, we obtain contrasting NL responses in low (< 2 T ) and high field regions. For low fields the NL behavior is dominated by a quadratic response (positive χ2), which shows a rapid rise below Tc. This large χ2 > 0 implies a broken sublattice symmetry of magnetic order at low temperatures. Classical Monte Carlo (CMC) simulations in the standard K − H − Γ model secure such a quadratic B dependence of M , only for T ≈ Tc with χ2 being zero as T → 0. It is also zero for all temperatures in exact diagonalization calculations. On the other hand, we find an exclusive cubic term (χ3) describes the high field NL behavior well. χ3 is large and positive both below and above Tc crossing zero only for T > 50 K. In contrast, for B c-axis, no separate low/high field behaviors is measured and only a much smaller χ3 is apparent.

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“…It turns out, however, that the appearance of true multipolar order, that is, of rank higher than dipolar order, is actually rare in solid state compounds. Thus far, true multipolar order has been discovered, or predicted, for about a dozen crystalline materials, such as, CeB 6 , 10-21) R 3 Pd 20 X 6 (R: Ce, Pr, X: Si, Ge), [22][23][24][25][26][27][28][29][30][31][32] PrPb 3 , [33][34][35][36][37][38][39][40][41][42] PrMg 3 , [43][44][45][46] A major question is which theoretical description is suitable to unveil insight in the origin of the multipolar order in crystal systems. Single ion crystal-electric field (CEF) theories could previously provide understanding of aspects of multipolar ordered ionic states, often in relation to the local point group symmetry and assumptions made regarding the CEF level scheme.…”

Section: Introductionmentioning

confidence: 99%

First-principles Theory of Magnetic Multipoles in Condensed Matter Systems

2018

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The multipole concept, which characterizes the spacial distribution of scalar and vector objects by their angular dependence, has already become widely used in various areas of physics. In recent years it has become employed to systematically classify the anisotropic distribution of electrons and magnetization around atoms in solid state materials. This has been fuelled by the discovery of several physical phenomena that exhibit unusual higher rank multipole moments, beyond that of the conventional degrees of freedom as charge and magnetic dipole moment. Moreover, the higher rank electric/magnetic multipole moments have been suggested as promising order parameters in exotic hidden order phases. While the experimental investigations of such anomalous phases have provided encouraging observations of multipolar order, theoretical approaches have developed at a slower pace. In particular, a materials' specific theory has been missing. The multipole concept has furthermore been recognized as the key quantity which characterizes the resultant configuration of magnetic moments in a cluster of atomic moments. This cluster multipole moment has then been introduced as macroscopic order parameter for a noncollinear antiferromagnetic structure in crystals that can explain unusual physical phenomena whose appearance is determined by the magnetic point group symmetry. It is the purpose of this review to discuss the recent developments in the first-principles theory investigating multipolar degrees of freedom in condensed matter systems. These recent developments exemplify that ab initio electronic structure calculations can unveil detailed insight in the mechanism of physical phenomena caused by the unconventional, multipole degree of freedom.These compounds have in common that the exotic multipolar electric or magnetic distribution occurs on the lanthanide or actinide ion and are thus generated by the f electrons.More general, typical features of f electron systems are localized character, that tends to enforce the strong electron-electron repulsion, a significant orbital degree of freedom, allowing for anisotropic orbital states, and strong spin-orbit (S-O) coupling which leads to entangled spin and orbital moments. * michito.suzuki@riken.jp 2/67

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Third-Order Magnetic Susceptibility and Quadrupolar Order Parameter of Kondo-Lattice Compound Ce₃Pd₂₀Ge₆

Cited by 15 publications

References 20 publications

Competition between ferromagnetic and antiferromagnetic states in Al8.5−Fe23Ge12.5+ (0≤x≤3)

Competition between ferromagnetic and antiferromagnetic states in Al8.5−Fe23Ge12.5+ (0≤x≤3)

Anomalous and Anisotropic Nonlinear Susceptibility in the Proximate Kitaev Magnet $α$-RuCl$_3$

First-principles Theory of Magnetic Multipoles in Condensed Matter Systems

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