Spectroscopic evidence of topological phase transition in the three-dimensional Dirac semimetal 
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Thirupathaiah, S.; Morozov, Igor; Kushnirenko, Yevhen; Fedorov, Alexander; Haubold, Erik; Kim, T. K.; Shipunov, Grigory; Maksutova, Anita I.; Kataeva, О. N.; Aswartham, Saicharan; Büchner, B.; Борисенко, С. В.

doi:10.1103/physrevb.98.085145

Cited by 14 publications

(11 citation statements)

References 26 publications

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“…Recent studies on thin films of Cd 3−x Zn x As 2 also support this scenario qualitatively [23][24][25] , although the topological phase transition takes place already around x ∼ 0.6 25 . We note that a similar transition is proposed to occur in related Cd 3 As 2−x P x on the basis of angle-resolved photoemission spectroscopy data 26 .…”

Section: Introductionsupporting

confidence: 73%

Doping-induced topological transition and enhancement of thermopower in the Dirac-semimetal system Cd$_{3-x}$Zn$_x$As$_2$

Fujioka,

Kriener,

Hashizume

et al. 2021

Preprint

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Cd 3 As 2 is one of the prototypical topological Dirac semimetals. Here, we manipulate the band inversion responsible for the emergence of Dirac nodes by alloying Cd 3 As 2 with topologically trivial Zn 3 As 2 . We observe the expected topological phase transition around a Zn concentration of x ∼ 1 while the carrier density monotonically decreases as x is increased. For larger x, the thermoelectric figure of merit exhibits comparably large values exceeding 0.3 at room temperature, due to the combined effects of a strong enhancement of the thermopower, an only moderate increase of the resistivity, and a suppression of the thermal conductivity. Complementary quantum-oscillation data and optical-conductivity measurements allow to infer that the enhanced thermoelectric performance is due to a flattening of the band structure in the higher-x region in Cd 3−x Zn x As 2 .

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Section: Introductionsupporting

confidence: 73%

Doping-induced topological transition and enhancement of thermopower in the Dirac-semimetal system Cd$_{3-x}$Zn$_x$As$_2$

Fujioka,

Kriener,

Hashizume

et al. 2021

Preprint

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“…However, when the nonsymmorphic symmetries are preserved, by completely filling out the 2b positions in Zr 5 Pt 3 C [Figure 5(c)], the nodal-line states remain protected. At this point it is important to note that, on average, effective pointgroup symmetries can be preserved in a homogeneously, perfectly randomly disordered alloy, thus we expect that the topological nodal-line phase could be observed even upon a high level of alloying [77][78][79][80][81], as in the case of Zr 5 Pt 3 C 0.5 .…”

Section: Theoretical Calculationsmentioning

confidence: 97%

Electron-phonon superconductivity in C-doped topological nodal-line semimetal Zr$_5$Pt$_3$: A muon spin rotation and relaxation ($μ$SR) study

Bhattacharyya,

Ferreira,

Panda

et al. 2021

Preprint

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In the present work we demonstrate that C-doped Zr 5 Pt 3 is an electron-phonon superconductor (with critical temperature T C = 3.7 K) with a nonsymmorphic topological Dirac nodal-line semimetal state, which we report here for the first time. The superconducting properties of Zr 5 Pt 3 C 0.5 have been investigated by means of magnetization and muon spin rotation and relaxation (µSR) measurements. We find that at low temperatures the depolarization rate is almost constant and can be well described by a single-band s−wave model with a superconducting gap of 2∆(0)/k B T C = 3.84, close to the value of BCS theory. From transverse field µSR analysis we estimate the London penetration depth λ L = 469 nm, superconducting carrier density n s = 2×10 26 m −3 , and effective mass m * = 1.584 m e . Zero field µSR confirms the absence of any spontaneous magnetic moment in the superconducting ground state. To gain additional insights into the electronic ground state of C-doped Zr 5 Pt 3 , we have also performed first-principles calculations within the framework of density functional theory (DFT). The observed homogenous electronic character of the Fermi surface as well as the mutual decrease of T C and density of states at the Fermi level are consistent with the experimental findings. However, the band structure reveals the presence of robust, gapless fourfold-degenarate nodal lines protected by 6 3 screw rotations and glide mirror planes. Therefore, Zr 5 Pt 3 represents a novel, unprecedented condensed matter system to investigate the intricate interplay between superconductivity and topology.

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“…Specifically, the experimental realization of threedimensional topological insulators [3] further boosted the field to new heights, from basic sciences to more complex technological designs for the futuristic topological quantum computations (TQC) [28][29][30][31][32]. At present, the topological quantum materials are classified by the Weyl fermions [13][14][15][16][17][18][19][20][21][22][23][24][25]33], the Dirac fermions [7][8][9][10][11][12]26], and the Majorana fermions [32,34]. In general, at the band crossing point (BCP), the Weyl fermions have twofold degeneracy and the Dirac fermions have fourfold degeneracy.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure studies of FeSi: A chiral topological system

Changdar¹,

Aswartham²,

Bose³

et al. 2020

Phys. Rev. B

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Spectroscopic evidence of topological phase transition in the three-dimensional Dirac semimetal Cd3(As1−xPx)2

Cited by 14 publications

References 26 publications

Doping-induced topological transition and enhancement of thermopower in the Dirac-semimetal system Cd$_{3-x}$Zn$_x$As$_2$

Doping-induced topological transition and enhancement of thermopower in the Dirac-semimetal system Cd$_{3-x}$Zn$_x$As$_2$

Electron-phonon superconductivity in C-doped topological nodal-line semimetal Zr$_5$Pt$_3$: A muon spin rotation and relaxation ($μ$SR) study

Electronic structure studies of FeSi: A chiral topological system

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