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1,188 items found (0 items not approved), displaying 1 to 10.[First/Prev] 1, 2, 3, 4, 5, 6, 7, 8 [Next/Last]

Instruments / Technical Area	Publication Details	Published
	Magnetic structure determination of multiple phases in the multiferroic candidate GdCrO3 Pascal Manuel , Dmitry Khalyavin , Fabio Orlandi , Laurent Chapon , Wang Xueyun , Tae-Hwan Jang , Eun Sang Choi , Sang-Wook Cheong Acta Crystallographica Section B Structural Science, Crystal Engineering And Materials 81 DOI: 10.1107/S2052520625001921 Open Access Show Abstract ▼ Abstract: Due to their potential applications in low-power consumption and/or multistate memory devices, multiferroic materials have attracted a lot of attention in the condensed matter community. As part of the effort to identify new multiferroic compounds, perovskite-based GdCrO3 was studied in both bulk and thin film samples. A strong enhancement of the capacitance in a field suggested ferroelectric behaviour but significant leakage and no well developed P–E hysteresis loops were observed. Measurements clearly indicate the existence of a polar phase but only below 2 K (likely connected to Gd ordering). Here the determination of the magnetic structure through neutron diffraction collected on an isotopic 160GdCrO3 sample at the WISH diffractometer at ISIS is reported. The presence of three successive magnetic phases as a function of temperature (commensurate, spin re-orientation and incommensurate phases once the Gd order), previously only seen by magnetization, is confirmed. Using the most recent guidelines for reporting the determined structures, we highlight the benefits of using such nomenclature for discussing physical properties and consider possible mechanisms and couplings that led this seemingly rather isotropic system to display the complex structures observed.	Jun 2025
I19-Small Molecule Single Crystal Diffraction	The varying temperature- and pressure-induced phase transition pathways in hybrid improper ferroelectric Sr3Sn2O7 Evie Ladbrook , Jeremiah P. Tidey , Fei-Ting Huang , Sang-Wook Cheong , Dominik Daisenberger , Mark R. Warren , Mark S. Senn Acta Crystallographica Section B Structural Science, Crystal Engineering And Materials 81 DOI: 10.1107/S2052520625002306 Diamond Proposal Number(s): [36775, 26668] Open Access Show Abstract ▼ Abstract: A variable-temperature and pressure single-crystal diffraction study of hybrid improper ferroelectric Sr3Sn2O7 is reported. In combination with symmetry analysis, we reveal that the application of pressure and temperature induce distinct phase transition pathways, driven by a differing response of the octahedral rotations to these stimuli. Contrary to what has been previously predicted, we observe the ferroelectric to paraelectric phase transition between 10.17(18) and 12.13(14) GPa, meaning the hybrid improper ferroelectric phase remains stable to significantly higher pressures than expected.	Jun 2025
	Dynamic competition between Cooper pair and spin density wave condensation B. Decrausaz , M. Pikulski , O. Ivashko , N. B. Christensen , J. Choi , L. Udby , K. Lefmann , H. M. Ronnow , J. Mesot , J. Ollivier , T. Kurosawa , N. Momono , M. Oda , J. Chang , D. G. Mazzone , C. Niedermayer Physical Review Research 7 DOI: 10.1103/PhysRevResearch.7.023131 Open Access Show Abstract ▼ Abstract: Quantum matter phases may coexist microscopically even when they display competing tendencies. A fundamental question is whether such a competition can be avoided through the elimination of one phase while the other one condenses into the ground state. Here, we present a high-resolution neutron spectroscopy study of the low-energy spin excitations in the high-temperature superconductor La1.855⁢Sr0.145⁢CuO4. In the normal state, we find low-energy magnetic fluctuations at incommensurate reciprocal lattice positions where spin-density-wave order emerges at lower Sr concentration or at high magnetic fields. While these spin excitations are largely suppressed by the emergence of the superconducting spin gap, some low-energy magnetic fluctuations persist deep inside the superconducting state. We interpret this result in terms of a dynamic competition between superconductivity and magnetism, where superconductivity impedes the condensation of low-energy magnetic fluctuations through the formation of magnetically mediated Cooper pairs.	May 2025
I16-Materials and Magnetism	Antiferrodistortive and ferroeletric phase transitions in freestanding films of SrTiO3 Ludmila Leroy , Shih-Wen Huang , Chun-Chien Chiu , Sheng-Zhu Ho , Janine Dössegger , Cinthia Piamonteze , Yi-Chun Chen , Elsa Abreu , Alessandro Bombardi , Jan-Chi Yang , Urs Staub Nano Letters DOI: 10.1021/acs.nanolett.4c05664 Open Access Show Abstract ▼ Abstract: Thin films’ properties can be greatly influenced by their supporting growth substrates. Even in the so-called strain-free heterostructure films, it is still unclear whether there will be no interfacial electronic reconstructions induced by the underlying substrates. Here, we report the studies of SrTiO3 (STO) films in the freestanding form (FS) with a thickness ranging from 20 to 80 nm. These STO films, by default, are in a strain-free state; they exhibit distinct properties not seen in both bulk and strain-free heterostructure forms. Our films show an enhanced antiferrodistortive (AFD) phase transition temperature with a preferential in-plane rotation axis for the TiO6 octahedra. The anisotropic Ti orbital occupancy around the surface signals the departure of its properties from the bulk. Moreover, we have found that the in-plane ferroelectricity can be strengthened by the reduced dimensionality, establishing that the dimensionality control is an important factor for enhancing STO’s ferroelectric response.	May 2025
I09-Surface and Interface Structural Analysis	Role of chalcogen atoms in in situ exfoliation of large-area 2D semiconducting transition metal dichalcogenides Zhiying Dan , Ronak Sarmasti Emami , Giovanna Feraco , Melina Vavali , Dominic Gerlach , Martin F Sarott , Yindi Zhu , Petra Rudolf , Antonija Grubisic-Cabo Frontiers In Nanotechnology 7 DOI: 10.3389/fnano.2025.1553976 Diamond Proposal Number(s): [35796] Open Access Show Abstract ▼ Abstract: Two-dimensional (2D) transition metal dichalcogenides have emerged as a promising platform for next-generation optoelectronic and spintronic devices. Mechanical exfoliation using adhesive tape remains the dominant method for preparing 2D materials of highest quality, including transition metal dichalcogenides, but always results in small-sized flakes. This limitation poses a significant challenge for investigations and applications where large scale flakes are needed. To overcome these constraints, we explored the preparation of 2D WS 2 and WSe 2 using a recently developed kinetic in situ single-layer synthesis method (KISS). In particular, we focused on the influence of different substrates, Au and Ag, and chalcogen atoms, S and Se, on the yield and quality of the 2D films. The crystallinity and spatial morphology of the 2D films were characterized using optical microscopy and atomic force microscopy, providing a comprehensive assessment of exfoliation quality. Low-energy electron diffraction verified that there is no preferential orientation between the 2D film and the substrate, while optical microscopy revealed that WSe 2 consistently outperformed WS 2 in producing large monolayers, regardless of the substrate used. Finally, X-ray diffraction and X-ray photoelectron spectroscopy demonstrate that no covalent bonds are formed between the 2D material and the underlying substrate. These results identify KISS method as a non-destructive method for a more scalable approach of high-quality 2D transition metal dichalcogenides.	May 2025
I19-Small Molecule Single Crystal Diffraction	Pressure-induced enhancement of polar distortions in a metal and implications for the Rashba spin splitting Evie Ladbrook , Urmimala Dey , Nicholas C. Bristowe , Robin S. Perry , Dominik Daisenberger , Mark R. Warren , Mark S. Senn Physical Review B 111 DOI: 10.1103/PhysRevB.111.205110 Diamond Proposal Number(s): [36775] Show Abstract ▼ Abstract: Polar metals are an intriguing class of materials that feature a polar crystal structure while also exhibiting metallic conductivity. The unique properties of polar metals challenge expectations, making way for the exploration of exotic phenomena such as unconventional magnetism, hyperferroelectric multiferroicity, and the development of multifunctional devices that can leverage both the material's polar structure and its asymmetry in the spin conductivity, that arises due to the Rashba effect. Here, via a high-pressure single-crystal diffraction study, we report the pressure-induced enhancement of polar distortions in such a metal, Ca3⁢Ru2⁢O7. Our density functional theory calculations highlight that naive assumptions about the linear dependency between polar distortion amplitudes and the magnitude of the Rashba spin splitting may not be generally valid.	May 2025
I07-Surface & interface diffraction	Revealing the charge transport physics in metallic coordination nanosheets by thermoelectric and magnetotransport measurements Tian Wu , Xinglong Ren , David Cornil , Claudio Quarti , Ian E. Jacobs , Lu Zhang , Naoya Fukui , David Beljonne , Hiroshi Nishihara , Henning Sirringhaus Science Advances 11 DOI: 10.1126/sciadv.adt9196 Diamond Proposal Number(s): [30708, 30349] Open Access Show Abstract ▼ Abstract: We have studied the charge transport physics of high-quality conducting coordination nanosheets films based on the benchmark material copper benzenehexathiol (CuBHT) by measuring multiple thermoelectric and magnetotransport coefficients on the same film. The films exhibit a metallic temperature dependence of the conductivity over a wide temperature range, but below 15 kelvin charge transport becomes dominated by weak localization and electron-electron interactions. Temperature-dependent Hall, Seebeck, and Nernst measurements consistently indicate the existence of ambipolar transport characteristics in CuBHT. A two-band analysis has been used to extract transport parameters for electron and hole carriers as a function of temperature. The results show that contributions from electron and hole conduction in CuBHT are of comparable magnitude, revealing the complexity of charge transport and allowing one to identify strategies for enhancing the thermoelectric transport coefficients of such conducting coordination nanosheets.	Apr 2025
I21-Resonant Inelastic X-ray Scattering (RIXS)	Doping dependence of 2-spinon excitations in the doped 1D cuprate Ba2CuO3+𝛿 Jiarui Li , Daniel Jost , Ta Tang , Ruohan Wang , Yong Zhong , Zhuoyu Chen , Mirian Garcia-Fernandez , Jonathan Pelliciari , Valentina Bisogni , Brian Moritz , Ke-Jin Zhou , Yao Wang , Thomas P. Devereaux , Wei-Sheng Lee , Zhi-Xun Shen Physical Review Letters 134 DOI: 10.1103/PhysRevLett.134.146501 Diamond Proposal Number(s): [32900] Show Abstract ▼ Abstract: Recent photoemission experiments on the quasi-one-dimensional Ba-based cuprates suggest that doped holes experience an attractive potential not captured using the simple Hubbard model. This observation has garnered significant attention due to its potential relevance to Cooper pair formation in high-𝑇𝑐 cuprate superconductors. To scrutinize this assertion, we examined signatures of such an attractive potential in doped 1D cuprates Ba2⁢CuO3+𝛿 by measuring the dispersion of the 2-spinon excitations using Cu 𝐿3-edge resonant inelastic x-ray scattering (RIXS). Upon doping, the 2-spinon excitations appear to weaken, with a shift of the minimal position corresponding to the nesting vector of the Fermi points, 𝑞𝐹. Notably, we find that the energy scale of the 2-spinons near the Brillouin zone boundary is substantially softened compared to that predicted by the Hubbard model in one dimension. Such a discrepancy implies missing ingredients, which lends support for the presence of an additional attractive potential between holes.	Apr 2025
I05-ARPES	Momentum-resolved fingerprint of Mottness in layer-dimerized Nb3Br8 Mihir Date , Francesco Petocchi , Yun Yen , Jonas A. Krieger , Banabir Pal , Vicky Hasse , Emily C. Mcfarlane , Chris Körner , Jiho Yoon , Matthew D. Watson , Vladimir N. Strocov , Yuanfeng Xu , Ilya Kostanovski , Mazhar N. Ali , Sailong Ju , Nicholas C. Plumb , Michael A. Sentef , Georg Woltersdorf , Michael Schüler , Philipp Werner , Claudia Felser , Stuart S. P. Parkin , Niels B. M. Schröter Nature Communications 16 DOI: 10.1038/s41467-025-58885-1 Diamond Proposal Number(s): [29240] Open Access Show Abstract ▼ Abstract: Crystalline solids can become band insulators due to fully filled bands, or Mott insulators due to strong electronic correlations. While Mott insulators can theoretically occur in systems with an even number of electrons per unit cell, distinguishing them from band insulators experimentally has remained a longstanding challenge. In this work, we present a unique momentum-resolved signature of a dimerized Mott-insulating phase in the experimental spectral function of Nb3Br8: the top of the highest occupied band along the out-of-plane direction kz has a momentum-space separation Δkz = 2π/d, whereas that of a band insulator is less than π/d, where d is the average interlayer spacing. Identifying Nb3Br8 as a Mott insulator is crucial to understand its role in the field-free Josephson diode effect. Moreover, our method could be extended to other van der Waals systems where tuning interlayer coupling and Coulomb interactions can drive a band- to Mott-insulating transition.	Apr 2025
I11-High Resolution Powder Diffraction I19-Small Molecule Single Crystal Diffraction	Superstructure formation through coupled anion and cation ordering in Cu-substituted lead oxyapatites Jan P. Scheifers , Adam J. D. Richardson , Hai Lin , Hongjun Niu , Luke M. Daniels , Michael W. Gaultois , Jonathan Alaria , Craig Robertson , John B. Claridge , Matthew J. Rosseinsky Chemistry Of Materials 45 DOI: 10.1021/acs.chemmater.4c03130 Diamond Proposal Number(s): [36629, 31578] Open Access Show Abstract ▼ Abstract: Apatites are an important mineral-based material family with huge chemical and structural diversity. They were recently implicated in the claims of high-temperature superconductivity in materials labeled LK-99 that display complex phase mixtures containing Pb, Cu, phosphate, and oxide components. We report Cu-substituted lead apatite solid solutions Pb10–xCux(PO4)6O that display two distinct compositional ranges differentiated by structural ordering. For x > 0.5, we observe substitution in the apatite archetype structure, whereas for x < 0.5, we find an apatite superstructure with coupled anion and cation ordering. The 1 × 1 × 2 superstructure in the noncentrosymmetric space group P6̅ (no. 174) for Pb10–xCux(PO4)6O with x < 0.5 exhibits a unique oxygen ordering motif in the hexagonal channels and selective Cu substitution only on two out of seven Pb sites. At x > 0.5 in Pb10–xCux(PO4)6O, Cu cations are introduced onto all Pb sites, which triggers the transition to the archetypical apatite structure, reflecting the coupling of the core structural components of the apatite framework in the ordering pattern.	Apr 2025

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