Giant resistivity and X-ray diffraction anomalies in low-dimensional ZrTe5 and HfTe5

Skelton, E. F.; Wieting, Terence J.; Wolf, Stuart A.; Fuller, W. W.; Gubser, D. U.; Francavilla, T. L.; Lévy, F.

doi:10.1016/0038-1098(82)91016-x

Cited by 58 publications

(44 citation statements)

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“…Single crystal Xray diffraction demonstrates that our HfTe5 samples adopt the Cmcm structure with lattice parameters a = 3.974(1) Å, b = 14.481(2) Å, c = 13.720(2) Å, in good agreement with previously reported structural data 20 . The crystal structure of HfTe5 is shown in Figure 1a 11,12,22 . A similar resistive anomaly is observed in related zirconium pentatelluride ZrTe5 10,11 .…”

Section: Resultsmentioning

confidence: 99%

“…The crystal structure of HfTe5 is shown in Figure 1a 11,12,22 . A similar resistive anomaly is observed in related zirconium pentatelluride ZrTe5 10,11 . This anomaly in pentatellurides is likely associated with peculiarities of their electronic structure although the origin still remains elusive 23,24,25 .…”

Section: Resultsmentioning

confidence: 99%

“…Pentatellurides MTe5 (M = Zr or Hf) are the highest tellurides in MTen. Particularly, MTe5 have been previously investigated for the enigmatic resistivity anomaly 10,11,12 , thermoelectric properties 13 and quantum oscillations 14,15 .…”

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confidence: 99%

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Pressure-driven superconductivity in the transition-metal pentatellurideHfTe5

Shi

Naumov

et al. 2016

Phys. Rev. B

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Pressure-driven superconductivity in the transition-metal pentatellurideHfTe5

Shi

Naumov

et al. 2016

Phys. Rev. B

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“…It will be very interesting to observe such topological phase transitions in experiments, simply by pressing or stretching the sample along the stacking direction. Considering the large magneto-resistive effect observed in both ZrTe 5 and HfTe 5 [20], it will also be heuristic to see whether the longstanding mysterious giant resistivity anomaly [21] has anything to do with the possible weak-to-strong TI phase transition, by carefully studying the change of lattice parameters and the possible surface states as a function of temperature or pressure.…”

Section: E 3d Weak and Strong Timentioning

confidence: 99%

Transition-Metal PentatellurideZrTe5andHfTe5: A Paradigm for Large-Gap Quantum Spin Hall Insulators

2014

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Quantum spin Hall (QSH) insulators, a new class of quantum matter, can support topologically protected helical edge modes inside a bulk insulating gap, which can lead to dissipationless transport. A major obstacle to reaching a wide application of QSH is the lack of suitable QSH compounds, which should be easily fabricated and have a large bulk gap. Here, we predict that single-layer ZrTe 5 and HfTe 5 are the most promising candidates for large-gap insulators, with a bulk direct (indirect) band gap as large as 0.4 eV (0.1 eV) and which are robust against external strains. The three-dimensional crystals of these two materials are good layered compounds with very weak interlayer bonding, and they are located near the phase boundary between weak and strong topological insulators, paving a new way for future experimental studies on both the QSH effect and topological phase transitions.

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“…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.…”

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

Zhou

Ning

et al. 2016

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

147

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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Giant resistivity and X-ray diffraction anomalies in low-dimensional ZrTe5 and HfTe5

Cited by 58 publications

References 6 publications

Pressure-driven superconductivity in the transition-metal pentatellurideHfTe5

Pressure-driven superconductivity in the transition-metal pentatellurideHfTe5

Transition-Metal PentatellurideZrTe5andHfTe5: A Paradigm for Large-Gap Quantum Spin Hall Insulators

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

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Giant resistivity and X-ray diffraction anomalies in low-dimensional ZrTe5 and HfTe5

Cited by 58 publications

References 6 publications

Pressure-driven superconductivity in the transition-metal pentatellurideHfTe5

Pressure-driven superconductivity in the transition-metal pentatellurideHfTe5

Transition-Metal PentatellurideZrTe5andHfTe5: A Paradigm for Large-Gap Quantum Spin Hall Insulators

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

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