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Changdar, Susmita; Ghosh, Susanta; Vijay, Kritika; Kar, Indrani; Routh, Sayan; Maheswari, P.K.; Ghorai, Soumya; Banik, Soma; Thirupathaiah, S.

doi:10.1016/j.physb.2023.414799

Cited by 7 publications

(6 citation statements)

References 47 publications

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“…For the temperatures above 10 K, R xx increases with increasing temperature for MBT (Fig. 2(a)) indicating its metallic nature as observed in bulk [13,28] and flakes (∼100-200 nm thick) [13] of single crystalline MBT . At temperature ≲10 K, R xx shows upturn, which suggests its nonmetallic behaviour (see inset Fig.…”

Section: Methodsmentioning

confidence: 75%

“…2(a)) in very lowtemperature regime. This behaviour could be attributed to the bulk carriers freezing and disorder induced electron-electron interaction [28][29][30]. Plausibly, the presence of disorder has also caused disappearance of spin fluctuation driven AFM transition peak in the R-T plot, similar to the thin film grown via co-sputtering technique [31].…”

Section: Methodsmentioning

confidence: 80%

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Physical, Psycho-social and Economic Burden of Chronic Obstructive Pulmonary Disease: A Hospital-Based Study in Kolkata, West Bengal, India

Mukherjee¹,

Chakraborti²,

Mukhopadhyay³

2022

The Indian Journal of Chest Diseases and Allied Sciences

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MnBi 2 Te 4 , the first topological insulator with inherent magnetic ordering, has attracted significant attention recently for providing a platform to realize several exotic quantum phenomena at relatively higher temperatures. In this work, we have carried out an exhaustive investigation of MnBi 2 Te 4 and Sb doped MnBi 2 Te 4 thin films using THz time-domain spectroscopy. The extracted real THz conductivity displays a strong IR active E u phonon absorption peak (at ∼1.5 THz) merged on top of the Drude-like contributions from bulk and surface electrons. The extracted parameters from the THz conductivity data fitted to the Drude-Fano-Lorentz model, show significant changes in their temperature dependence around the magnetic ordering Néel temperature of ∼ 25K, which is suggestive of the coupling between magnetic ordering and electronic band structure. The frequency of the E u phonon displays an anomalous blue-shift with increasing temperatures by ∼ 0.1 THz (∼7%) for MnBi 2 Te 4 and ∼0.2 THz (∼13%) for Sb doped MnBi 2 Te 4 between 7K and 250K. The line-shape of the E u phonon mode in Sb doped MnBi 2 Te 4 shows significant Fano asymmetry compared to that of MnBi 2 Te 4 , indicating that Sb doping plays an important role in the Fano interference between the phonons and the electrons, in this system. These results indicate that the anomalous phonon behaviour seen in MBT arise mainly from positive cubic anharmonicity induced self energy parameter, whereas both anharmonicity and the electron phonon coupling are at play in making the relatively higher anomalous blue shift of phonons in MBST. Our studies provide the first comprehensive understanding of the phonon and electron dynamics of MnBi 2 Te 4 and Sb doped MnBi 2 Te 4 in the THz range using time-domain THz spectroscopy.

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Section: Methodsmentioning

confidence: 75%

Section: Methodsmentioning

confidence: 80%

Physical, Psycho-social and Economic Burden of Chronic Obstructive Pulmonary Disease: A Hospital-Based Study in Kolkata, West Bengal, India

Mukherjee¹,

Chakraborti²,

Mukhopadhyay³

2022

The Indian Journal of Chest Diseases and Allied Sciences

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“…Several studies [29][30][31][32][33] have demonstrated the synthesis of these crystals and confirmed the absence of additional substitution defects, as in the case of s substitution of Sb for Bi atoms.…”

Section: Introductionmentioning

confidence: 67%

Comparative Study of Magnetic Properties of (Mn$_{1-x}$A$_x^{IV}$)Bi2Te4 A$_x^{IV}$ = Ge, Pb, Sn

Estyunin¹,

Rybkina²,

Кох³

et al. 2023

Preprint

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We investigated the magnetic properties of antiferromagnetic (AFM) topological insulator MnBi$_2$Te$_4$ with partial substitution of Mn atoms by non-magnetic elements (A$_x^{IV}$ = Ge, Pb, Sn). Samples with various element concentrations (10-80%) were studied using SQUID magnetometry. The results demonstrate that, for all substitutes the type of magnetic ordering remains AFM, while the Nèel temperature (T$_N$) and spin-flop transition field (H$_{SF}$) decrease with increasing A$_x^{IV}$ = Ge, Pb, Sn concentration. The rate of decrease varies among the elements, being highest for Pb, followed by Sn and Ge. This behavior is attributed to combined effects of magnetic dilution and lattice parameter increase on magnetic properties, most prominent in (Mn$_{1−x}$Pb$_x$)Bi$_2$Te$_4$. Besides this, the linear approximation of experimental data of T$_N$ and H$_{SF}$ suggests higher magnetic parameters for pure MnBi$_2$Te$_4$ than observed experimentally, indicating the possibility of their non-monotonic variation at low concentrations and the potential for enhancing magnetic properties through doping MnBi$_2$Te$_4$ with small amounts of nonmagnetic impurities. Notably, the (Mn$_{1−x}$Pb$_x$)Bi$_2$Te$_4$ sample with 10% Pb substitution indeed exhibits increased magnetic parameters, which is also validated by local analyses using ARPES. Our findings shed light on tailoring the magnetic behavior of MnBi$_2$Te$_4$-based materials, offering insights for potential applications in device technologies.

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“…However, there is another possibility of modulating the energy gap at the DP and reaching the TPT point through the partial replacement of Mn atoms with IV-group elements (Ge, Sn, Pb) [36][37][38][39][40][41][42] . In Refs [36][37][38] , it was shown that when Mn is replaced by Ge, Sn, or Pb atoms in the Mn 1−x A x Bi 2 Te 4 (A = Ge, Sn, Pb) compounds, the bulk band gap decreases with an increase in the concentration of the substituting atoms.…”

Section: Introductionmentioning

confidence: 99%

Phase transitions, Dirac and WSM states in Mn1−xGexBi2Te4

Shikin,

Zaitsev,

Estyunina

et al. 2024

Preprint

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Using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT), an experimental andtheoretical study of changes in the electronic structure (dispersion dependencies) and corresponding modification of the energyband gap at the Dirac point (DP) for topological insulator (TI) Mn1−xGexBi2Te4 have been carried out with gradual replacementof magnetic Mn atoms by non-magnetic Ge atoms when concentration of the latter was varied from 10% to 75%. It was shownthat when Ge concentration increases then the bulk band gap decreases and reaches zero plateau in the concentration range of45%–60% while non-topological surface states (TSS) are present and exhibit an energy splitting of 100 and 70 meV in differenttypes of measurements. It was also shown that TSS disappear from the measured band dispersions at a Ge concentrationof about 40%. DFT calculations of Mn1−xGexBi2Te4 band structure were carried out to identify the nature of observed banddispersion features and to analyze a possibility of magnetic Weyl semimetal state formation in this system. These calculationswere performed for both antiferromagnetic (AFM) and ferromagnetic (FM) ordering types while the spin-orbit coupling (SOC)strength was varied or a strain (compression or tension) along the c-axis was applied. Calculations show that two differentseries of topological phase transitions (TPTs) may be implemented in this system depending on the magnetic ordering. At AFMordering transition between TI and trivial insulator phase goes through the Dirac semimetal state, whereas for FM phase suchroute admits three intermediate states instead of one (TI — Dirac semimetal — Weyl semimetal — Dirac semimetal — trivialinsulator). Weyl points that form in FM system along the ΓZ direction annihilate when either the SOC strength decreases or asufficient tensile strain is applied, which is accompanied by the corresponding TPTs. Model calculations of local magneticordering influence in AFM Mn1−xGexBi2Te4 was carried out by alternating Mn layers and Ge-doped layers and showed that themagnetic Weyl semimetal state in this system is reachable at a Ge concentration of approximately 40% without application ofany external magnetic fields

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Nonmagnetic Sn doping effect on the electronic and magnetic properties of antiferromagnetic topological insulator MnBi2Te4

Cited by 7 publications

References 47 publications

Physical, Psycho-social and Economic Burden of Chronic Obstructive Pulmonary Disease: A Hospital-Based Study in Kolkata, West Bengal, India

Physical, Psycho-social and Economic Burden of Chronic Obstructive Pulmonary Disease: A Hospital-Based Study in Kolkata, West Bengal, India

Comparative Study of Magnetic Properties of (Mn$_{1-x}$A$_x^{IV}$)Bi2Te4 A$_x^{IV}$ = Ge, Pb, Sn

Phase transitions, Dirac and WSM states in Mn1−xGexBi2Te4

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