Quantum phase transition and destruction of Kondo effect in pressurized SmB6

Zhou, Yazhou; Wu, Qi; Rosa, P. F. S.; Yu, Rong; Guo, Jing; Wu, Yi; Zhang, Shan; Wang, Zhe; Wang, Honghong; Cai, Shengbao; Yang, Ke; Li, Aiguo; Jiang, Zheng; Zhang, Shuo; Wei, Xianhua; Huang, Yuying; Sun, Peijie; Yang, Y.; Fisk, Z.; Si, Qimiao; Zhao, Ziliang; Sun, Liling

doi:10.1016/j.scib.2017.10.008

Cited by 29 publications

(43 citation statements)

References 43 publications

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“…[8,27,28]. As the pressure increases, it undergoes a magnetic phase transition at the critical pressure of 6 ∼ 10 GPa [20][21][22][23][24]. As mentioned previously, while the actual magnetic ordering is not clarified experimentally, our first-principles calculations indicate that the A-AFM [with M //x as shown in Fig.…”

Section: A Crystal and Electronic Structuressupporting

confidence: 64%

“…The hybridization between the localized 4f -orbitals and the itinerant 5d-orbitals of Sm opens up a gap, making it a topological Kondo insulator. Furthermore, SmB 6 turns into the magnetic state upon pressurization (at P ≥ 6 GPa) [20][21][22][23][24]. Although experimentally it is not clear whether it is ferromagnetic or antiferromagnetic, our first-principles calculations reveal that the A-type antiferromagnetic (A-AFM) configuration is the ground state of the pressurized SmB 6 .…”

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confidence: 76%

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Anomalous Z2 antiferromagnetic topological phase in pressurized SmB6

Chang¹,

Chen²

2018

Phys. Rev. B

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Antiferromagnetic materials, whose time-reversal symmetry is broken, can be classified into the Z2 topology if they respect some specific symmetry. Since the theoretical proposal, however, no materials have been found to host the antiferromagnetic topological (AFT) phase to date. Here, for the first time, we demonstrate that the topological Kondo insulator SmB6 can be an AFT system when pressurized to undergo an antiferromagnetic phase transition. In addition to propose the possible candidate for an AFT material, in this work we also illustrate the anomalous topological surface states of the AFT phase which has not been discussed before. Originating from the interplay between the topological properties and the antiferromagnetic surface magnetization, the topological surface states of the AFT phase behave differently as compared with those of a topological insulator. Besides, the AFT insulators are also found promising in the generation of tunable spin currents, which is an important application in spintronics.

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Section: A Crystal and Electronic Structuressupporting

confidence: 64%

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confidence: 76%

Anomalous Z2 antiferromagnetic topological phase in pressurized SmB6

Chang¹,

Chen²

2018

Phys. Rev. B

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“…The application of pressure drives the valence change of Sm ions from delocalized to localized state，i.e., the concentration of magnetic Sm 3+ ions is enhanced upon compression. Previous high-pressure absorption measurements [33,[48][49][50] indicated that its mean valence is very close to 3+ at P>~10 GPa. The pressure-induced valence change of Sm 2+ → (Sm 3+ +5d), together with its stable cubic lattice structure, should be responsible for the robustness of long-ranged magnetic order [35,[48][49][50].…”

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confidence: 99%

Hall-coefficient diagnostics of the surface state in pressurized SmB6

et al. 2020

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In this study, we report the first results of the high-pressure Hall coefficient (R H ) measurements in the putative topological Kondo insulator SmB 6 up to 37 GPa. Below 10 GPa, our data reveal that R H (T) exhibits a prominent peak upon cooling below 20 K. Remarkably, the temperature at which surface conduction dominates coincides with the temperature of the peak in R H (T). The temperature dependent resistance and Hall coefficient can be well fitted by a two-channel model with contributions from the metallic surface and the thermally activated bulk states. When the bulk of SmB 6 becomes metallic and magnetic at ~ 10 GPa, both the R H (T) peak and the resistance plateau disappear simultaneously. Our results indicate that the R H (T) peak is a fingerprint to diagnose the presence of a metallic surface state in SmB 6 . The high-pressure magnetic state of SmB 6 is robust to 180 GPa, and no evidence of superconductivity is observed in the metallic phase.

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“…13 Similarly, in half-filled TKI, theoretical calculations have verified a transition to AF phase when the hybridization interaction V is weakened, 10,14 reminiscent of the induced magnetism in pressurized SmB 6 . [15][16][17] Besides, our earlier work has proved that due to the combined S symmetry of time reversal and translation operations, the AF states in TKI remain topological distinguishable, regardless of the breaking of TRS by magnetic order. We has developed a Z 2 topological classification to the AF states in TKI and proposed a novel AFTI phase under unique setting of model parameters, together with an AFTI-nontopological AF insulator (nAFI) topological transition while EH was shifted in some way.…”

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confidence: 99%

“…2(a) and (b)), which may be account for the metallic phase observed in pressurized SmB 6 . 15,21 Based on the PM phase diagrams of TI s , we now study the AF transitions in TKI. In our previous work, the original K-R method of symmetric PAM 19,20 has been generalized to treat AF phases in non-symmetric case, 10 which can be applied to TKI.…”

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confidence: 99%

Magnetic and topological transitions in three-dimensional topological Kondo insulator

Wang

Zheng

et al. 2018

Chinese Phys. Lett.

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By using an extended slave-boson method, we draw a global phase diagram summarizing both magnetic phases and paramagnetic (PM) topological insulating phases (TIs) in three-dimensional topological Kondo insulator (TKI). By including electron hopping (EH) up to third neighbor, we identify four strong topological insulating (STI) phases and two weak topological insulating (WTI) phases, then the PM phase diagrams characterizing topological transitions between these TIs are depicted as functions of EH, f -electron energy level and hybridization constant. We also find an insulator-metal transition from a STI phase which has surface Fermi rings and spin textures in qualitative agreement to TKI candidate SmB6. In weak hybridization regime, antiferromagnetic (AF) order naturally arises in the phase diagrams, and depending on how the magnetic boundary crosses the PM topological transition lines, AF phases are classified into AF topological insulator (AFTI) and non-topological AF insulator (nAFI), according to their Z2 indices. In two small regions of parameter space, two distinct topological transition processes between AF phases occur, leading to two types of AFTI, showing distinguishable surface dispersions around their Dirac points.

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Quantum phase transition and destruction of Kondo effect in pressurized SmB6

Cited by 29 publications

References 43 publications

Anomalous Z2 antiferromagnetic topological phase in pressurized SmB6

Anomalous Z2 antiferromagnetic topological phase in pressurized SmB6

Hall-coefficient diagnostics of the surface state in pressurized SmB6

Magnetic and topological transitions in three-dimensional topological Kondo insulator

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