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Gallo-Frantz A, Jacques VLR, Sinchenko AA, Ghoneim D, Ortega L, Godard P, Renault PO, Hadj-Azzem A, Lorenzo JE, Monceau P, Thiaudière D, Grigoriev PD, Bellec E, Le Bolloc'h D. Charge density waves tuned by biaxial tensile stress. Nat Commun 2024; 15:3667. [PMID: 38693169 PMCID: PMC11063040 DOI: 10.1038/s41467-024-47626-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 04/08/2024] [Indexed: 05/03/2024] Open
Abstract
The precise arrangement and nature of atoms drive electronic phase transitions in condensed matter. To explore this tenuous link, we developed a true biaxial mechanical deformation device working at cryogenic temperatures, compatible with x-ray diffraction and transport measurements, well adapted to layered samples. Here we show that a slight deformation of TbTe3 can have a dramatic influence on its Charge Density Wave (CDW), with an orientational transition from c to a driven by the a/c parameter, a tiny coexistence region near a = c, and without space group change. The CDW transition temperature Tc displays a linear dependence witha / c - 1 while the gap saturates out of the coexistence region. This behaviour is well accounted for within a tight-binding model. Our results question the relationship between gap and Tc in RTe3 systems. This method opens a new route towards the study of coexisting or competing electronic orders in condensed matter.
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Affiliation(s)
- A Gallo-Frantz
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405, Orsay Cedex, France
| | - V L R Jacques
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405, Orsay Cedex, France.
| | - A A Sinchenko
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405, Orsay Cedex, France
| | - D Ghoneim
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405, Orsay Cedex, France
| | - L Ortega
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405, Orsay Cedex, France
| | - P Godard
- Institut Pprime, CNRS-Université de Poitiers-ENSMA, 86962, Futuroscope-Chasseneuil Cedex, France
| | - P-O Renault
- Institut Pprime, CNRS-Université de Poitiers-ENSMA, 86962, Futuroscope-Chasseneuil Cedex, France
| | - A Hadj-Azzem
- Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000, Grenoble, France
| | - J E Lorenzo
- Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000, Grenoble, France
| | - P Monceau
- Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000, Grenoble, France
| | - D Thiaudière
- Synchrotron SOLEIL, L'Orme des Merisiers, 91190, Saint-Aubin, France
| | - P D Grigoriev
- L. D. Landau Institute for Theoretical Physics, Chernogolovka, Moscow Region, 142432, Russia
- National University of Science and Technology 'MISiS', 119049, Moscow, Russia
| | - E Bellec
- CEA Grenoble, IRIG, MEM, NRS, 17 rue des Martyrs, F-38000, Grenoble, France
| | - D Le Bolloc'h
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405, Orsay Cedex, France
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The Effect of Intensity Fluctuations on Sequential X-ray Photon Correlation Spectroscopy at the X-ray Free Electron Laser Facilities. CRYSTALS 2020. [DOI: 10.3390/cryst10121109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
How materials evolve at thermal equilibrium and under external excitations at small length and time scales is crucial to the understanding and control of material properties. X-ray photon correlation spectroscopy (XPCS) at X-ray free electron laser (XFEL) facilities can in principle capture dynamics of materials that are substantially faster than a millisecond. However, the analysis and interpretation of XPCS data is hindered by the strongly fluctuating X-ray intensity from XFELs. Here we examine the impact of pulse-to-pulse intensity fluctuations on sequential XPCS analysis. We show that the conventional XPCS analysis can still faithfully capture the characteristic time scales, but with substantial decrease in the signal-to-noise ratio of the g2 function and increase in the uncertainties of the extracted time constants. We also demonstrate protocols for improving the signal-to-noise ratio and reducing the uncertainties.
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Ma Y, Lu C, Wang X, Du X, Li L, Petrovic C. Field-induced dielectric response saturation in o-TaS3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:395901. [PMID: 27485146 DOI: 10.1088/0953-8984/28/39/395901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We investigated dependence of the dielectric properties on temperature and electric field below 50 K along the chain direction of o-TaS3. With external electric field increase, two threshold features could be identified. For electric fields somewhat larger than the lower threshold [Formula: see text], the dielectric constant starts to decrease whereas the conductivity increases due to the tunnelling of solitons. For higher external electric field we observe a saturation of dielectric response and analyze that the possible reasons may be related to the polarization behavior of charged solitons. With a decrease in temperature, the effect of external field on the dielectric response of the system weakens gradually and at 13 K it diminishes due to soliton freezing.
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Affiliation(s)
- Yongchang Ma
- School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, People's Republic of China. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA. Key Laboratory of Display Materials and Photoelectric Devices (Tianjin University of Technology), Ministry of Education, Tianjin 300384, People's Republic of China
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Shpyrko OG. X-ray photon correlation spectroscopy. JOURNAL OF SYNCHROTRON RADIATION 2014; 21:1057-64. [PMID: 25177994 DOI: 10.1107/s1600577514018232] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Accepted: 08/08/2014] [Indexed: 05/20/2023]
Abstract
In recent years, X-ray photon correlation spectroscopy (XPCS) has emerged as one of the key probes of slow nanoscale fluctuations, applicable to a wide range of condensed matter and materials systems. This article briefly reviews the basic principles of XPCS as well as some of its recent applications, and discusses some novel approaches to XPCS analysis. It concludes with a discussion of the future impact of diffraction-limited storage rings on new types of XPCS experiments, pushing the temporal resolution to nanosecond and possibly even picosecond time scales.
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Affiliation(s)
- Oleg G Shpyrko
- Department of Physics, University of California San Diego, 9500 Gilman Drive, Mail Code 0319, La Jolla, CA 92093-0319, USA
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Pinsolle E, Kirova N, Jacques VLR, Sinchenko AA, Le Bolloc'h D. Creep, flow, and phase slippage regimes: an extensive view of the sliding charge-density wave revealed by coherent X-ray diffraction. PHYSICAL REVIEW LETTERS 2012; 109:256402. [PMID: 23368483 DOI: 10.1103/physrevlett.109.256402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Indexed: 06/01/2023]
Abstract
Coherent x-ray diffraction experiments have been used to probe the dynamics of the charge density wave (CDW) in the quasi-1D system NbSe(3). The 2k(F) satellite reflection associated with the CDW has been measured with respect to external dc currents, below and above the depinning current. These measurements illustrate for the first time the extensive behavior of a moving electronic crystal: the creep regime, with nucleation of CDW dislocations, the flow regime, with motional ordering, along with phase slippage and the role of strong pinning due to an extrinsic defect.
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Affiliation(s)
- E Pinsolle
- Laboratoire de Physique des Solides, CNRS-UMR 8502, Bâtiment 510, Université Paris-sud, 91405 Orsay cedex, France
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Bachelard R, Mercère P, Idir M, Couprie ME, Labat M, Chubar O, Lambert G, Zeitoun P, Kimura H, Ohashi H, Higashiya A, Yabashi M, Nagasono M, Hara T, Ishikawa T. Wavefront analysis of nonlinear self-amplified spontaneous-emission free-electron laser harmonics in the single-shot regime. PHYSICAL REVIEW LETTERS 2011; 106:234801. [PMID: 21770510 DOI: 10.1103/physrevlett.106.234801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Indexed: 05/31/2023]
Abstract
The single-shot spatial characteristics of the vacuum ultraviolet self-amplified spontaneous emission of a free electron laser (FEL) is measured at different stages of amplification up to saturation with a Hartmann wavefront sensor. We show that the fundamental radiation at 61.5 nm tends towards a single-mode behavior as getting closer to saturation. The measurements are found in good agreement with simulations and theory. A near diffraction limited wavefront was measured. The analysis of Fresnel diffraction through the Hartmann wavefront sensor hole array also provides some further insight for the evaluation of the FEL transverse coherence, of high importance for various applications.
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Affiliation(s)
- R Bachelard
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, Gif-sur-Yvette, France
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Abstract
Coherent X-ray diffraction has been applied in the imaging of inorganic materials with great success. However, its application to biological specimens has been limited to some notable exceptions, due to the induced radiation damage and the extended nature of biological samples, the last limiting the application of most part of the phasing algorithms. X-ray ptychography, still under development, is a good candidate to overcome such difficulties and become a powerful imaging method for biology. We describe herein the feasibility of applying ptychography to the imaging of biological specimens, in particular collagen rich samples. We report here speckles in diffraction patterns from soft animal tissue, obtained with an optimized small angle X-ray setup that exploits the natural coherence of the beam. By phasing these patterns, dark field images of collagen within tendon, skin, bone, or cornea will eventually be obtained with a resolution of 60-70 nm. We present simulations of the contrast mechanism in collagen based on atomic force microscope images of the samples. Simulations confirmed the 'speckled' nature of the obtained diffraction patterns. Once inverted, the patterns will show the disposition and orientation of the fibers within the tissue, by enhancing the phase contrast between protein and no protein regions of the sample. Our work affords the application of the most innovative coherent X-ray diffraction tools to the study of biological specimens, and this approach will have a significant impact in biology and medicine because it overcomes many of the limits of current microscopy techniques.
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Reichhardt C, Olson Reichhardt CJ. Nonequilibrium phases for driven particle systems with effective orientational degrees of freedom. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2009; 79:061403. [PMID: 19658505 DOI: 10.1103/physreve.79.061403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2009] [Indexed: 05/28/2023]
Abstract
We show that a rich variety of nonequilibrium phases can be realized for interacting particles moving over a periodic substrate when the particles have effective internal orientational degrees of freedom. We specifically study driven colloidal molecular crystals where it has been established that n-merization produces effective orientational degrees of freedom. This system exhibits a polarization effect within the pinned phase, a remarkable variety of sliding phases, and has no single particle pinning regime. Similar dynamics should occur for other driven systems with effective orientational degrees of freedom such as sliding diatomic or higher-order states.
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Affiliation(s)
- C Reichhardt
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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