Fermi surface, effective masses, and Dingle temperatures of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">ZrTe</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>as derived from the Shubnikov<i>–</i>de Haas effect

Kamm, G. N.; Gillespie, D. J.; Ehrlich, A. C.; Wieting, Terence J.; Lévy, F.

doi:10.1103/physrevb.31.7617

Cited by 66 publications

(69 citation statements)

References 11 publications

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“…Single crystals of ZrTe 5 were grown via vapor transport method in a two-zone furnace with elements Zr (99.99%), Te (99.99%), and iodine (transport agent) (40). Structural and compositional characterizations of the crystals by X-ray diffraction, scanning and transmission electron microscopy, together with electron diffraction and energy dispersive X-ray spectroscopy studies confirm its high quality.…”

Section: Methodsmentioning

confidence: 99%

Pressure-induced superconductivity in a three-dimensional topological material ZrTe ₅

Zhou

Ning

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

144

105

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As a new type of topological materials, ZrTe 5 shows many exotic properties under extreme conditions. Using resistance and ac magnetic susceptibility measurements under high pressure, while the resistance anomaly near 128 K is completely suppressed at 6.2 GPa, a fully superconducting transition emerges. The superconducting transition temperature T c increases with applied pressure, and reaches a maximum of 4.0 K at 14.6 GPa, followed by a slight drop but remaining almost constant value up to 68.5 GPa. At pressures above 21.2 GPa, a second superconducting phase with the maximum T c of about 6.0 K appears and coexists with the original one to the maximum pressure studied in this work. In situ high-pressure synchrotron X-ray diffraction and Raman spectroscopy combined with theoretical calculations indicate the observed two-stage superconducting behavior is correlated to the structural phase transition from ambient Cmcm phase to high-pressure C2/m phase around 6 GPa, and to a mixture of two high-pressure phases of C2/m and P-1 above 20 GPa. The combination of structure, transport measurement, and theoretical calculations enable a complete understanding of the emerging exotic properties in 3D topological materials under extreme environments.high pressure | Dirac semimetals | superconductivity | synchrotron X-ray diffraction S ince the first report of topological insulator, an extensive attention in recent years has been focused on newly emergent Dirac materials including topological insulators (1-3), Dirac semimetals (4, 5), and Weyl semimetals (5-7) for their unique quantum phenomena. ZrTe 5 has been studied for a long time due to its large thermoelectric power (8, 9), resistivity anomaly (10, 11), and large positive magnetoresistance (12). Recent theoretical works (13,14) have proposed that single-layer ZrTe 5 is a large gap quantum spin hall insulator, but the bulk ZrTe 5 behaves between the strong and weak topological insulator. These predictions spark the renewed interest in the investigation of its Dirac and topological characters. Indeed, the magnetotransport experiments (15) have observed the chiral magnetic effect, both angle-resolved photoemission spectroscopy (15) and magneto-infrared spectroscopy (16, 17) study show the electronic structure of ZrTe 5 is similar with other three-dimensional (3D) Dirac semimetals like Na 3 Bi (18-20) and Cd 3 As 2 (21-25). These results suggest that ZrTe 5 is a very promising system that hosts topological properties and might help to pave a new way for further experimental studies of topological phase transitions.As one of the fundamental state parameters, high pressure is an effective, clean way to tune lattice as well as electronic states, especially in quantum states (26)(27)(28). In this work, by performing resistance and ac magnetic susceptibility measurements on ZrTe 5 single crystal at various pressures up to 68.5 GPa, a superconducting transition at 1.8 K was first noticed at a pressure of 6.2 GPa. It was interesting to notice that the occurrence of the metallic pha...

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Section: Methodsmentioning

confidence: 99%

Pressure-induced superconductivity in a three-dimensional topological material ZrTe ₅

Zhou

Ning

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

144

105

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“…The ZrTe5 crystal structure belongs to the Cmcm ( 2ℎ 17 ) space group 32 The intensity of different Raman vibration modes can be described as 29 :…”

mentioning

confidence: 99%

Observation of Optical and Electrical In-Plane Anisotropy in High-Mobility Few-Layer ZrTe₅

Qiu

Charnas

et al. 2016

Nano Lett.

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Transition metal pentatelluride ZrTe5 is a versatile material in condensed-matter physics and has been intensively studied since the 1980's. The most fascinating feature of ZrTe5 is that it is a 3D Dirac semimetal which has linear energy dispersion in all three dimensions in momentum space. Structure-wise, ZrTe5 is a layered material held together by weak interlayer van der Waals force. The combination of its unique band structure and 2D atomic structure provides a fertile ground for more potential exotic physical phenomena in ZrTe5 related to 3D Dirac semimentals. However the physical properties of its few-layer form have yet to be thoroughly explored. Here we report strong optical and electrical in-plane anisotropy of mechanically exfoliated few-layer ZrTe5. Raman spectroscopy shows significant intensity change with sample orientations, and the behavior of angle-resolved phonon modes at the Γ point is explained by theoretical calculation. DC conductance measurement indicates a 50% of difference along different in-plane directions. The diminishing of resistivity anomaly in few-layer samples indicates the evolution of band structure with reduced thickness. Low-temperature Hall experiment sheds lights on more intrinsic anisotropic electrical transport, with hole mobility of 3,000 and 1,500 cm 2 /V· s along a-axis and c-axis respectively. Pronounced quantum oscillations in magnetoresistance are observed at low temperatures with highest electron mobility up to 44,000 cm 2 /V· s.Keywords: ZrTe5 Single crystal, 2D material, optical anisotropy, electrical anisotropy, quantum oscillations 3The discovery of graphene 1 began a new era of condensed-matter research because of its unique two-dimensional Dirac band structure, which hosts many profound physical phenomena such as the anomalous integer quantum Hall effect (IQHE) 2 . Since then great efforts have been made towards expanding the spectrum of topological materials and bringing many conceptual materials into reality. Transition metal pentatellurides such as ZrTe5 and HfTe5 have been widely studied in bulk form since early 1980's due to their anomalous resistivity peak and X-ray diffraction intensity peak at low temperature 3,4 , large thermoelectric power 5 , pressure-induced superconductivity 6,7 , absence of a structural phase transition corresponding to resistivity anomaly 8 , and chiral magnetic effect 9 . In recent years, ZrTe5 research has been revived because of its non-trivial topological properties. Some theoretical predictions and experimental results 10,11 indicate that it is a 3D Dirac semimetal, a mimic of graphene with linear energy dispersion in all three directions. On the other hand, its monolayer form is also claimed to be a candidate of quantum spin Hall insulator 12,13 , which is very rare among the natural compounds 14 . Shubnikov-de Haas oscillations 10,15,16 , Zeeman Splitting 17,18 , and fractional quantum Hall effect 19 were also observed in bulk ZrTe5.Meanwhile in recent years the 2D family has been expanded to a wide range of mat...

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“…Layered material ZrTe 5 has been known for decades due to its large thermoelectric power 36,37 , resistivity anomaly 38 and quantum oscillations 39,40 . Earlier experimental results exhibited an extremely small ellipsoidal Fermi surface 40 with small effective mass in the chain direction.…”

Section: Introductionmentioning

confidence: 99%

Transport evidence for the three-dimensional Dirac semimetal phase inZrTe5

et al. 2016

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Topological Dirac semimetal is a newly discovered class of materials which has attracted intense attentions. This material can be viewed as a three-dimensional (3D) analog of graphene and has linear energy dispersion in bulk, leading to a range of exotic transport properties. Here we report direct quantum transport evidence of the 3D Dirac semimetal phase of layered material ZrTe 5 by angular dependent magnetoresistance measurements under high magnetic fields up to 31 T. We observed very clear negative longitudinal magnetoresistance induced by chiral anomaly under the condition of the magnetic field aligned only along the current direction. Pronounced Shubnikov-de Hass (SdH) quantum oscillations in both longitudinal magnetoresistance and transverse Hall resistance were observed, revealing anisotropic light cyclotron masses and high mobility of the system. In particular, a nontrivial π-Berry phase in the SdH oscillations gives clear evidence for 3D Dirac semimetal phase. Furthermore, we observed clear Landau level splitting under high magnetic field, suggesting possible splitting of the Dirac point into Weyl points due to broken time reversal symmetry. Our results indicate that ZrTe 5 is an ideal platform to study 3D massless Dirac and Weyl fermions in a layered compound.

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Fermi surface, effective masses, and Dingle temperatures ofZrTe5as derived from the Shubnikov–de Haas effect

Cited by 66 publications

References 11 publications

Pressure-induced superconductivity in a three-dimensional topological material ZrTe ₅

Pressure-induced superconductivity in a three-dimensional topological material ZrTe ₅

Observation of Optical and Electrical In-Plane Anisotropy in High-Mobility Few-Layer ZrTe₅

Transport evidence for the three-dimensional Dirac semimetal phase inZrTe5

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Fermi surface, effective masses, and Dingle temperatures ofZrTe5as derived from the Shubnikov–de Haas effect

Cited by 66 publications

References 11 publications

Pressure-induced superconductivity in a three-dimensional topological material ZrTe 5

Pressure-induced superconductivity in a three-dimensional topological material ZrTe 5

Observation of Optical and Electrical In-Plane Anisotropy in High-Mobility Few-Layer ZrTe5

Transport evidence for the three-dimensional Dirac semimetal phase inZrTe5

Contact Info

Product

Resources

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Pressure-induced superconductivity in a three-dimensional topological material ZrTe ₅

Pressure-induced superconductivity in a three-dimensional topological material ZrTe ₅

Observation of Optical and Electrical In-Plane Anisotropy in High-Mobility Few-Layer ZrTe₅