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Time-resolved optical spectroscopy of collective and single-particle excitations of 1T-TaS2 and 2H-TaSe2 reveals the presence of a large gap in the excitation spectrum on the femtosecond timescale, associated with the formation of various…

Strongly Correlated Electrons · Physics 2009-11-07 J. Demsar , L. Forro , H. Berger , D. Mihailovic

Charge density wave (CDW) orders in YNiC2 are studied by means of combined experimental and computational techniques. On the experimental side, single crystals grown by the floating-zone method were examined by means of X-ray diffraction,…

Strongly Correlated Electrons · Physics 2025-05-07 Marta Roman , Simone Di Cataldo , Berthold Stöger , Lisa Reisinger , Emilie Morineau , Kamil K. Kolincio , Herwig Michor

Pair density wave (PDW) states are defined by a spatially modulating superconductive order-parameter. To search for such states in transition metal dichalcogenides (TMD) we use high-speed atomic-resolution scanned Josephson-tunneling…

Superconductivity · Physics 2021-06-29 Xiaolong Liu , Yi Xue Chong , Rahul Sharma , J. C. Séamus Davis

By quantitative low-energy electron diffraction (LEED) we investigate the extensively studied commensurate charge density wave (CDW) phase of trigonal tantalum disulphide (1T-TaS$_2$), which develops at low temperatures with a…

We have grown thulium tellurides (TmTe2, TmTe3) thin layers (less than four layers) on graphene/SiC (0001) by molecular beam epitaxy. The charge density waves (CDWs) and lattice superstructures (LSs) are investigated by scanning tunneling…

Materials Science · Physics 2021-05-24 Zhilin Xu , Zimeng Zeng , Shuai-hua Ji , Xinqiang Cai , Xi Chen

We report incommensurate diffuse (ICD) scattering appearing in the high-temperature-tetragonal (HTT) phase of La$_{2-x}$(Sr,Ba)$_{x}$CuO$_{4}$ with $0.07 \leq x \leq 0.20$ observed by the neutron diffraction technique. For all compositions,…

Suppressing of an ordered state that competes with superconductivity is one route to enhance superconducting transition temperatures. Whereas the effect of suppressing magnetic states is still not fully understood, materials featuring…

Recently, kagome lattice metal AV$_3$Sb$_5$ (A = K, Rb, Cs) family has received wide attention due to its presence of superconductivity, charge density wave (CDW) and peculiar properties from topological nontrivial electronic structure.…

Superconductivity · Physics 2021-10-14 Z. X. Wang , Q. Wu , Q. W. Yin , Z. J. Tu , C. S. Gong , T. Lin , Q. M. Liu , L. Y. Shi , S. J. Zhang , D. Wu , H. C. Lei , T. Dong , N. L. Wang

The intermetallic compound BaFe2Al9 exhibits unusual physical properties associated with a charge density wave (CDW) transition. Unlike conventional CDW materials, which typically display subtle structural distortions or lattice…

Charge density wave (CDW) implies a periodic modulation of the charge density. Typically observed in metallic systems, CDWs arise from Fermi surface instabilities, resulting in the total or partial gapping of the Fermi surface. Here, we…

VSe$_2$ is a layered compound that has attracted great attention due to its proximity to a ferromagnetic state that is quenched by the presence of a charge density wave (CDW) phase. In the monolayer limit, unrelated experiments have…

Materials Science · Physics 2023-04-18 Adolfo O. Fumega , Josu Diego , V. Pardo , S. Blanco-Canosa , Ion Errea

An unexpected feature common to 2H-transition metal dichalcogenides (2H-TMDs) is revealed with first-principles Wannier functions analysis of the electronic structure of the prototype 2H-TaSe2: The low-energy Ta \red{``$5d_{z^2}$''} bands…

Strongly Correlated Electrons · Physics 2009-11-11 Ryan Barnett , Anatoli Polkovnikov , Eugene Demler , Wei-Guo Yin , Wei Ku

Although charge density waves (CDWs) are omnipresent in cuprate high-temperature superconductors, they occur at significantly different wavevectors, confounding efforts to understand their formation mechanism. Here, we use resonant…

We report a neutron diffraction study of the magnetic phase transitions in the charge-density-wave (CDW) TbTe$_3$ compound. We discover that in the paramagnetic phase there are strong 2D-like magnetic correlations, consistent with the…

Strongly Correlated Electrons · Physics 2012-01-10 F. S. Pfuner , S. N. Gvasaliya , O. Zaharko , L. Keller , J. Mesot , V. Pomjakushin , J. -H. Chu , I. R. Fisher , L. Degiorgi

Intertwining charge density wave (CDW) with spin and pairing order parameters is a major focus of contemporary condensed matter physics. Lattice distortions and local symmetry breaking resulted from CDWs are crucial for the emergence of…

Materials Science · Physics 2025-03-13 Haoyang Ni , William R. Meier , Hu Miao , Andrew J. May , Brian C. Sales , Jian-min Zuo , Miaofang Chi

The intrinsic frustrated nature of a kagome lattice is amenable to the realization of exotic phases of matter, such as quantum spin liquids or spin ices, and more recently the multiple-$\mathrm{\textbf{q}}$ charge density waves (CDW) in the…

Two-dimensional (2D) atomic materials possess very different properties from their bulk counterparts. While changes in the single-particle electronic properties have been extensively investigated, modifications in the many-body collective…

Materials Science · Physics 2015-12-18 Xiaoxiang Xi , Liang Zhao , Zefang Wang , Helmuth Berger , László Forró , Jie Shan , Kin Fai Mak

Charge density waves (CDW) profoundly affect the electronic properties of materials and have an intricate interplay with other collective states, like superconductivity and magnetism. The well-known macroscopic Ginzburg-Landau theory stands…

Strongly Correlated Electrons · Physics 2024-02-14 Lotte Mertens , Jeroen van den Brink , Jasper van Wezel

Charge density wave (CDW) correlations have recently been shown to universally exist in cuprate superconductors. However, their nature at high fields inferred from nuclear magnetic resonance is distinct from that measured by x-ray…

Using temperature dependent Raman spectroscopy we address the question of how the transition from bulk to few atomic layers affects the charge density wave (CDW) phases in 1T-TaS2. We find that for crystals with thickness larger than approx…

Mesoscale and Nanoscale Physics · Physics 2019-10-30 Adina Luican-Mayer , Jeffrey R. Guest , Saw-Wai Hla