Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2

Koumoulis, Dimitrios; Taylor, Robert E.; McCormick, Jeffrey; Ertaş, Yavuz Nuri; Pan, Lei; Che, Xiaoyu; Wang, Kang L.; Bouchard, Louis

doi:10.1063/1.4999467

Cited by 10 publications

(2 citation statements)

References 42 publications

(37 reference statements)

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“…24) Furthermore, orbital fluctuations can be probed by the nuclear spin-lattice relaxation rate 1/T 1 in Dirac and Weyl semimetals, 20,23) whereas the materials so far reported involve significant spin excitation in 1/T 1 due to the existence of Fermi surface. [25][26][27][28][29][30][31][32][33][34] In this Letter, we demonstrate the diamagnetic hyperfine fields and the orbital excitation by 209 Bi NMR experiments in Bi 1−x Sb x for x = 0.08 − 0.16 under magnetic field parallel and perpendicular to the c axis. By comparing the Knight shift with the magnetic susceptibility, we analyze the temperature (T ) dependent and the anomalous T -invariant components.…”

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confidence: 99%

Local Observations of Orbital Diamagnetism and Excitation in Three-Dimensional Dirac Fermion Systems Bi$_{1-x}$Sb$_x$

Watanabe,

Kumazaki,

Ezure

et al. 2021

Preprint

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Dirac fermions display a singular response against magnetic and electric fields. A distinct manifestation is large diamagnetism originating in the interband effect of Bloch bands, as observed in bismuth alloys. Through 209 Bi NMR spectroscopy, we extract diamagnetic orbital susceptibility inherent to Dirac fermions in the semiconducting bismuth alloys Bi 1−x Sb x (x = 0.08 − 0.16). The 209 Bi hyperfine coupling constant provides an estimate of the effective orbital radius. In addition to the interband diamagnetism, Knight shift includes an anomalous temperature-independent term originating in the enhanced intraband diamagnetism under strong spin-orbit coupling. The nuclear spin-lattice relaxation rate 1/T 1 is dominated by orbital excitation and follows cubic temperature dependence in the extensive temperature range. The result demonstrates the robust diamagnetism and low-lying orbital excitation against the small gap opening, whereas x-dependent spin excitation appears at low temperatures.Relativistic Dirac fermions exhibit large diamagnetism at room temperature, as observed in bismuth alloys Bi 1−x Sb x 1, 2) and graphite. 3,4) Similar to supercurrent of the Meissner effect, the diamagnetism of Dirac semimetals with linearly crossing bands comes from dissipationless orbital current in thermodynamic equilibrium under magnetic field. In contrast to the Landau-Peierls diamagnetism of conducting electrons, the diamagnetism in Bi 1−x Sb x is enhanced as the chemical potential µ is located close to the Dirac point 1,5) or inside the band gap. The interband effect of Bloch bands has solved the mystery based on the exact formula of orbital susceptibility for three-dimensional (3D) Dirac fermions 6,7) and relates to the giant spin Hall effect 8) observed in Bi 1−x Sb x . 9) Since the transport properties include a significant *

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confidence: 99%

Local Observations of Orbital Diamagnetism and Excitation in Three-Dimensional Dirac Fermion Systems Bi$_{1-x}$Sb$_x$

Watanabe,

Kumazaki,

Ezure

et al. 2021

Preprint

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“…2) при 𝑇 = 2, 4 и 10 К может быть вызван эффектом слабой антилокализации. Наличие слабой антилокализации характерно для соединений арсенида кадмия из-за наличия сильного спин-орбитального взаимодействия [9]. Эффект слабой антилокализации типичен для двумерных поверхностных состояний объемных монокристаллов и тонких пленок [19] и является признаком топологических поверхностных состояний.…”

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Квантовые Поправки К Проводимости В Аморфном Полупроводнике

Никуличева¹,

Пилюк²,

Иванов³

et al. 2022

ПМ&Ф

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В данной работе представлены результаты исследования магнитосопротивления (МС) тонкой пленки арсенида кадмия, нанесенной на подложку из лейкосапфира. При изучении МС наблюдался эффект слабой антилокализации, возникающий из-за поверхностных состояний. Наблюдаемый эффект хорошо описывается моделью Хиками – Ларкина – Нагаоки. Расчетное значение длины фазовой когерентности Lф изменяется в зависимости от температуры T по степенному закону Lф ∼ T −1/2, что свидетельствует о наличии двумерных топологических поверхностных состояний.

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Thermodynamic Evaluation and Optimization of the As–Cd, As–Zn and As–Cd–Zn Systems

Kidari

Chartrand

2023

Metall Mater Trans B

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In this work, a critical evaluation of all available phase diagrams and thermodynamic data for the As–Cd, As–Zn and As–Cd–Zn systems has been performed and thermodynamic assessments over the whole composition ranges are presented using the CALPHAD method. To predict thermodynamic properties and phase equilibria for these systems, the Modified Quasichemical Model for short range ordering was used for the liquid phase and the Compound Energy Formalism was used for the solid solutions. The optimized binary systems are in good agreement with existing experimental data. Within the ternary system predicted phase equilibria, the $${\text{ZnAs}}_{2}{-}{\text{CdAs}}_{2}$$ ZnAs 2 - CdAs 2 and $${{\text{Zn}}_{3}\text{As}}_{2}{-}{{\text{Cd}}_{3}\text{As}}_{2}$$ Zn 3 As 2 - Cd 3 As 2 sections are in good agreement with the experimental data. Also, the eutectic temperature is accurately optimized for $${\text{ZnAs}}_{2}{-}{{\text{Cd}}_{3}\text{As}}_{2}$$ ZnAs 2 - Cd 3 As 2 and $${{\text{Zn}}_{3}\text{As}}_{2}{-}{\text{CdAs}}_{2}$$ Zn 3 As 2 - CdAs 2 . However, the calculated liquidus of these two joins are less satisfactory compared to the experimental data. This is most likely due to the polymerization behavior of arsenic and its multivalence, which is not considered by the model used in this work.

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Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2

Abstract: Cd3As2 is a Dirac semimetal that is a 3D analog of graphene. We investigated the local structure and nuclear-spin dynamics in Cd3As2 via 113

Cited by 10 publications

References 42 publications

Local Observations of Orbital Diamagnetism and Excitation in Three-Dimensional Dirac Fermion Systems Bi$_{1-x}$Sb$_x$

Local Observations of Orbital Diamagnetism and Excitation in Three-Dimensional Dirac Fermion Systems Bi$_{1-x}$Sb$_x$

Квантовые Поправки К Проводимости В Аморфном Полупроводнике

Thermodynamic Evaluation and Optimization of the As–Cd, As–Zn and As–Cd–Zn Systems

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