Observation of two separate charge density wave transitions in Gd2Te5 via transmission electron microscopy and high-resolution X-ray diffraction

Shin, K. Y.; Ru, N.; Fisher, I. R.; Condron, Cathie L.; Toney, Michael F.; Wu, Yaqiao; Kramer, M. J.

doi:10.1016/j.jallcom.2009.09.154

Cited by 5 publications

(4 citation statements)

References 27 publications

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“…In order to reveal the structural features in correlation with the CDW transitions and superconductivity in the rareearth poly-tellurides, we have carried out a number of in situ TEM observations with a number of well-characterized samples. For the parent phases RETe 3 and RE 2 Te 5 , similar structural modulations and microstructure features for CDW states have been observed as reported in previous literatures [8,13,39,40]. Moreover, our careful analysis suggests that the incommensurate modulation become evidently invisible in superconducting samples, this fact demonstrates that the CDW states formed in the double Te planes is efficiently suppressed in association with the appearances of superconductivity.…”

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confidence: 88%

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Superconductivity in Pd-intercalated charge-density-wave rare earth poly-tellurides RETe_n

Wang

Yang

et al. 2016

Supercond. Sci. Technol.

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The interplay between magnetism and superconductivity is one of the dominant themes in the study of unconventional superconductors, such as high-T c cuprates, iron pnictides and heavy fermions 1-3 . In such systems, the same d-or f-electrons tend to form magnetically ordered states and participate in building up a high density of states at the Fermi level, which is responsible for the superconductivity. Charge-density-wave (CDW) is another fascinating collective quantum phenomenon in some low dimensional materials, like the prototypical transition-metal poly-chalcogenides, in which CDW instability is frequently found to accompany with superconducting transition at low temperatures 4 . Remarkably, similar to the antiferromagnetic superconductors, superconductivity can also be achieved upon suppression of CDW order via chemical doping or applied pressure in 1T-TiSe 2 (ref. 5, 6). However, in these CDW superconductors, the two ground states are believed to occur in different parts of Fermi surface (FS) sheets, derived mainly from chalcogen p-states and transition metal d-states, respectively.The origin of superconductivity and its interplay with CDW instability has not yet been unambiguously determined. Here we report on the discovery of bulk superconductivity in Pd-intercalated CDW R E Te n (R E =rare earth; n=2.5, 3) compounds, which belong to a large family of rare-earth poly-chalcogenides with CDW instability usually developing in the planar square nets of tellurium at remarkably high transition temperature and the electronic properties are also dominated by chalcogen p-orbitals. Our study demonstrates that the intercalation of palladium leads to the suppression of the CDW order and the emergence of the superconductivity. Our finding could provide an ideal model system for comprehensive studies of the interplay between CDW and superconductivity.

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confidence: 88%

“…TEM investigations in Gd 2 Te 5 revealed the commensurate structural modulations can be written as q 1 = 5/12a* + 1/12c* and q 2 = 1/12a* + 5/12c* (ref. 57).…”

mentioning

confidence: 99%

Superconductivity in Pd-intercalated charge-density-wave rare earth poly-tellurides RETe_n

Wang

Yang

et al. 2016

Supercond. Sci. Technol.

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“…Numerical calculations for specific compounds are performed in the framework of various methods: from a simple tight binding approximation based on the localized atomic orbitals (LCAO) to the sophisticated schemes utilizing the density functional theory (DFT) and various ab initio techniques. Calculations performed for the semiconductor layered systems [6,7] certify the reliability of the LCAO method which reproduces main features of the electron spectrum obtained with the use of the LMTO scheme (a version of the DFT in the local density approximation). A simple LCAO approach was successful in the calculation of the electron spectrum of two-, three-(and more) layer graphene [8].…”

Section: Introductionmentioning

confidence: 78%

Electron spectrum of intercalated stage ordered layered structures: Periodic Anderson model approach

Stasyuk¹,

Velychko²

2015

Math. Model. Comput.

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Influence of intercalation on the electronic band structure of the layered nanohybrid compound of the GaSe-type with a stage ordering (three layers in the packet in the considered case) is studied in the modified version of the periodic Anderson model. Density of electron states for the intercalated system is calculated both in the impurity single-level approximation and the one with the level smearing out (of the Lorentzian-type) due to local electron correlations. Intercalated particles form an additional band (usually placed near the bottom of the main band) like the narrow impurity band (being far enough from the main band) or the more extended band hybridized with the main one (for the case of overlapping). The most pronounced transformation of the main band takes place in the vicinity of the impurity level. Changes in the total density of electron states due to the broadening of impurity levels and the increase of the intercalant concentration are analyzed.

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“…For example, the LnTe 3 family of compounds hosts a Te square-net with a slightly higher than ideal electron count (6.5 rather than 6) per square-net atom. These compounds have long been studied for their desire to undergo CDW-type distortions resulting in very complex incommensurate crystal structures [55,[77][78][79][80][81][82][83][84][85]. These structures do not feature fully localized 2c-2e bonds, thus, despite the CDW, the hypervalency remains to some degree.…”

Section: Trends Trends In In Chemistry Chemistrymentioning

confidence: 99%

Chemical bonds in topological materials

Khoury

Schoop

2021

Trends in Chemistry

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Observation of two separate charge density wave transitions in Gd2Te5 via transmission electron microscopy and high-resolution X-ray diffraction

Cited by 5 publications

References 27 publications

Superconductivity in Pd-intercalated charge-density-wave rare earth poly-tellurides RETe_n

Superconductivity in Pd-intercalated charge-density-wave rare earth poly-tellurides RETe_n

Electron spectrum of intercalated stage ordered layered structures: Periodic Anderson model approach

Chemical bonds in topological materials

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Observation of two separate charge density wave transitions in Gd2Te5 via transmission electron microscopy and high-resolution X-ray diffraction

Cited by 5 publications

References 27 publications

Superconductivity in Pd-intercalated charge-density-wave rare earth poly-tellurides RETen

Superconductivity in Pd-intercalated charge-density-wave rare earth poly-tellurides RETen

Electron spectrum of intercalated stage ordered layered structures: Periodic Anderson model approach

Chemical bonds in topological materials

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Product

Resources

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Superconductivity in Pd-intercalated charge-density-wave rare earth poly-tellurides RETe_n

Superconductivity in Pd-intercalated charge-density-wave rare earth poly-tellurides RETe_n