Cichorek 
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Cichorek, T.; Bochenek, Ł.; Schmidt, Manfred; Niewa, Rainer; Czulucki, Andreas; Auffermann, Gudrun; Steglich, F.; Kniep, Rüdiger; Kirchner, Stefan

doi:10.1103/physrevlett.118.259702

Cited by 8 publications

(11 citation statements)

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“…In another report Zaránd further pointed that if the electrons interact with the TLS through resonant scattering then the strong coupling regime is reached and thus the orbital 2CK effect can be achieved [21]. In addition, many groups have reported the experimental demonstration of orbital 2CK effect due to the electron scattering from structural disorder as illustrated by the TLS model [18,20,[25][26][27][28]. For example, Cichorek et al reported an lnT variation of resistivity in glasslike single crystal ThAsSe which is not affected by the strong magnetic field (≤ 17 T) or high hydrostatic pressure (≤ 1.88 GPa).…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the orbital quantum number of the scatterers play the role of (pseudo) spin and the spin degeneracy (up and down) of conduction electrons form the two channels. The TLS may arise from the positional disorder in metallic glasses [17] or due to the local distortion created as a result of Jahn-Teller effect [18] or by the presence of non-magnetic disorder in the crystals [19]. The orbital 2CK effect depends on the symmetry and the strength of coupling (J) between conduction electrons and the TLS, the tunnelling rate of the atom and the imbalance of electron density in the two channels.…”

Section: Introductionmentioning

confidence: 99%

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Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO₃ and CoFe₂O₄

Patra

Maity

Kamble

et al. 2018

J. Phys.: Condens. Matter

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We report the tuning from spin one channel to orbital two-channel Kondo (2CK) effect by varying CoFeO (CFO) content in the composites with LaNiO (LNO) along with the presence of ferrimagnetism. Although there is no signature of resistivity upturn in the case of pure LNO, all the composites exhibit a distinct upturn in the temperature range of 30-80 K. For composites with lower percentage of CFO (10%), the electron spin plays the key role in the emergence of resistivity upturn which is affected by external magnetic field. On the other hand, when the CFO content is increased (⩾15%), the upturn shows strong robustness against high magnetic field (⩽14 T) and a crossover in temperature variation from [Formula: see text] to T at the Kondo temperature, indicating the appearance of orbital 2CK effect. The orbital 2CK effect originates due to the scattering of conduction electrons from the structural two-level systems which is created at the interfaces between the two phases (LNO and CFO) of different crystal structures as well as inside the crystal planes. The specific heat data at low temperature (⩽40 K), deviates from the usual linear temperature variation of the electronic contribution. With higher CFO content it shows more deviation which also indicates the increasing amount of two-level system. A negative magnetoresistance (MR) is observed at low temperature (<30 K) for composites containing both lower (10%) and higher percentage (15%) of CFO. We have analyzed the negative MR using Khosla and Fisher semi-empirical model based on spin dependent scattering of conduction electrons from localized spins.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO₃ and CoFe₂O₄

Patra

Maity

Kamble

et al. 2018

J. Phys.: Condens. Matter

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“…19 Additionally, some lower RRR Bi flux-grown samples showed a low temperature upturn in resistivity, which in other layered systems whose structures contain As "nets" has been linked to As vacancies. 20 It is possible that the presence of As vacancies in FeAs crystals depends on the growth method and affects transport properties, although no sign of As deficiency was seen in EDS. The data in Fig.…”

Section: Transport Resultsmentioning

confidence: 99%

Quantum oscillations in the anomalous spin density wave state of FeAs

et al. 2017

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Quantum oscillations in the binary antiferromagnetic metal FeAs are presented and compared to theoretical predictions for the electronic band structure in the anomalous spin density wave state of this material. Demonstrating a new method for growing single crystals out of Bi flux, we utilize the highest quality FeAs to perform torque magnetometry experiments up to 35 T, using rotations of field angle in two planes to provide evidence for one electron and one hole band in the magnetically ordered state. The resulting picture agrees with previous experimental evidence for multiple carriers at low temperatures, but the exact Fermi surface shape differs from predictions, suggesting that correlations play a role in deviation from ab initio theory and cause up to a four-fold enhancement in the effective carrier mass.

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“…In particular, in the two-channel case M = 2, i.e., the twochannel Kondo (2CK) model, logarithmic corrections in the thermodynamic properties occur instead, leading to χ imp ∝ ln T and γ imp ∝ ln T for T → 0 with an anomalous Wilson ratio R W = χ imp /γ imp = 8/3, in contrast to the result of the standard single-impurity Kondo model R W = 8/4 = 2. On the experimental side, several realizations of the 2CK effect have also been obtained [21][22][23][24][25][26][27] .…”

Section: Introductionmentioning

confidence: 92%

Order parameter for the multichannel Kondo model at quantum criticality

Zheng

He²,

Lu³

2021

Phys. Rev. B

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A multi-channel Kondo model, where two or more equivalent but independent channels of electrons compete to screen a spin-1/2 impurity, shows overcompensation of the impurity spin, leading to the non-Fermi liquid behavior in various thermodynamic and transport properties. However, when the channel symmetry is broken, an impurity quantum phase transition can occur at zero temperature. Identification of an order parameter describing the impurity quantum phase transition is very difficult since it is beyond the conventional Landau-Ginzburg-Wilson theory. By employing the natural orbitals renormalization group method, we have studied both two-channel and three-channel Kondo models, from the perspective of spin correlation between the impurity and electrons in electronic channels. Here we demonstrate that by introducing spin correlation ratio as an order parameter we can characterize impurity quantum phase transitions driven by channel asymmetry. Especially the universal critical exponents β of spin correlation ratio and ν of correlation length are explicitly determined by finite-size scaling analysis, namely β = 0.10(1), ν = 2.0(1) and β = 0.10(1), ν = 2.5(1) for the two-channel and three-channel Kondo models, respectively.

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Cichorek et al. Reply:

Cited by 8 publications

References 8 publications

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO₃ and CoFe₂O₄

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO₃ and CoFe₂O₄

Quantum oscillations in the anomalous spin density wave state of FeAs

Order parameter for the multichannel Kondo model at quantum criticality

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Cichorek et al. Reply:

Cited by 8 publications

References 8 publications

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO3 and CoFe2O4

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO3 and CoFe2O4

Quantum oscillations in the anomalous spin density wave state of FeAs

Order parameter for the multichannel Kondo model at quantum criticality

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Product

Resources

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Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO₃ and CoFe₂O₄

Tuning spin one channel to exotic orbital two-channel Kondo effect in ferrimagnetic composites of LaNiO₃ and CoFe₂O₄