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714 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
I05-ARPES	Photoemission evidence of a novel charge order in kagome metal FeGe Zhisheng Zhao , Tongrui Li , Peng Li , Xueliang Wu , Jianghao Yao , Ziyuan Chen , Yajun Yan , Shengtao Cui , Zhe Sun , Yichen Yang , Zhicheng Jiang , Zhengtai Liu , Alex Louat , Timur Kim , Cephise Cacho , Aifeng Wang , Yilin Wang , Dawei Shen , Juan Jiang , Donglai Feng Science China Physics, Mechanics & Astronomy 68 DOI: 10.1007/s11433-024-2636-9 Diamond Proposal Number(s): [32274] Show Abstract ▼ Abstract: The kagome metal FeGe provides a rich platform for understanding the mechanisms behind competing orders, as it exhibits charge order (CO) emerging deep within the antiferromagnetic phase. To investigate the intrinsic origin of this behavior, we examine the evolution of the low-energy electronic structure across the phase transition in annealed FeGe samples using angle-resolved photoemission spectroscopy. We find no evidence supporting a conventional nesting mechanism, such as Fermi surface nesting or van Hove singularities. However, we observe two notable changes in the band structure: an electron-like band around the K point and another around the A point, both shifting upward in energy when CO forms. These findings are consistent with our density-functional theory calculations, which suggest that the charge order in FeGe is primarily driven by magnetic energy savings due to a lattice distortion involving Ge1-dimerization. Our results provide photoemission evidence supporting this novel mechanism for CO formation in FeGe, in contrast to the conventional nesting-driven mechanisms.	Jun 2025
	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
I07-Surface & interface diffraction	Charge transport and carrier polarity tuning by electrolyte gating in nickel benzenehexathiol coordination nanosheets Tian Wu , Xinglong Ren , Zhengkang Qu , Ian E. Jacobs , Lu Zhang , Naoya Fukui , Xin Chen , Hiroshi Nishihara , Henning Sirringhaus Advanced Materials 162 DOI: 10.1002/adma.202500164 Diamond Proposal Number(s): [30708, 30349] Open Access Show Abstract ▼ Abstract: Coordination nanosheets (CONASHs) or conjugated metal organic frameworks (MOFs) with distinctive metal-organic bonding structures exhibit promise for electronics, sensing, and energy storage. Porous Nickel-Benzene hexathiol complex (Ni-BHT) with noteworthy conductivity was first reported a decade ago, and recent synthetic modifications produced non-porous Ni-BHT with enhanced conductivity (≈50 S cm−1). Here the charge transport physics of such non-porous Ni-BHT films are studied with even higher conductivity (≈112 S cm−1). In contrast to the thermally activated electrical conductivity, thermoelectric measurements suggest an intrinsic metallic nature of Ni-BHT. It is shown that it is possible to tune the Fermi level and carrier polarity in Ni-BHT by electrolyte gating; gating is initially governed by the formation of an interfacial, electric double layer and then evolves into an electrochemical (de)doping process. These findings not only contribute to a deeper understanding of charge transport in CONASHs, but also show that Fermi level tuning is an effective approach for enhancing the thermoelectric performance of CONASHs.	Jun 2025
I21-Resonant Inelastic X-ray Scattering (RIXS)	Orbital inversion and emergent lattice dynamics in infinite layer CaCoO2 Daniel Jost , Eder G. Lomeli , Woo Jin Kim , Emily M. Been , Matteo Rossi , Stefano Agrestini , Ke-Jin Zhou , Chunjing Jia , Brian Moritz , Zhi-Xun Shen , Harold Y. Hwang , Thomas P. Devereaux , Wei-Sheng Lee Npj Quantum Materials 10 DOI: 10.1038/s41535-025-00778-z Diamond Proposal Number(s): [30402] Open Access Show Abstract ▼ Abstract: The layered cobaltate CaCoO2 exhibits a unique herringbone-like structure. Serving as a potential prototype for a new class of complex lattice patterns, we study the properties of CaCoO2 using X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS). Our results reveal a significant inter-plane hybridization between the Ca 4s- and Co 3d- orbitals, leading to an inversion of the textbook orbital occupation of a square planar geometry. Further, our RIXS data reveal a strong low energy mode, with anomalous intensity modulations as a function of momentum transfer close to a quasi-static response. These findings indicate that the newly discovered herringbone structure exhibited in CaCoO2 may serve as a promising laboratory for the design of materials having strong electronic, orbital and lattice correlations.	Jun 2025
I10-Beamline for Advanced Dichroism - scattering	Improved performance of polycrystalline antiferromagnet/ferromagnet stack by nitrogen-assisted deposition Y. Khaydukov , G. Mccafferty , A. Dobrynin , A. Devishvili , A. Vorobiev , P, Bencok , R. Fan , P. Steadman , K. Mcneill , M. Ormston Applied Physics Letters 126 DOI: 10.1063/5.0246304 Show Abstract ▼ Abstract: The deposition process of the IrMn3/Co70Fe30 bilayer of antiferromagnet/ferromagnet (AF/FM) type was modified by introducing a nitrogen additive in argon plasma during the magnetron sputtering of the Co70Fe30 layer. This slight modification significantly enhanced the exchange bias energy density and reduced coercivity of an AF/FM bilayer for the AF IrMn layer thickness ranging from 20 to 50 Å. Calculations indicate that the boost in exchange bias energy density and the reduction in coercivity can be attributed to the increased anisotropy energy of the AF layer, resulting in more effective pinning of the FM layer by AF grains. The increase in anisotropy is caused by the diffusion of nitrogen from the FM into the AF layer, as established by x-ray diffraction, neutron reflectometry, and x-ray magnetic circular dichroism. Our research allows us to improve magnetic characteristics of exchange-coupled FM/AF structures through minor modifications in the sputtering process and/or save up to 20% of the costly IrMn3 target by reducing the thickness of the AF layer.	Jun 2025
	Symmetry-protected electronic metastability in an optically driven cuprate ladder Hari Padma , Filippo Glerean , Sophia F. R. Tenhuisen , Zecheng Shen , Haoxin Wang , Luogen Xu , Joshua D. Elliott , Christopher C. Homes , Elizabeth Skoropata , Hiroki Ueda , Biaolong Liu , Eugenio Paris , Arnau Romaguera Camps , Byungjune Lee , Wei He , Yu Wang , Seng Huat Lee , Hyeongi Choi , Sang-Youn Park , Zhiqiang Mao , Matteo Calandra , Hoyoung Jang , Elia Razzoli , Mark P. M. Dean , Yao Wang , Matteo Mitrano Nature Materials 16 DOI: 10.1038/s41563-025-02254-2 Show Abstract ▼ Abstract: Optically excited quantum materials exhibit non-equilibrium states with remarkable emergent properties, but these phenomena are usually transient, decaying on picosecond timescales and limiting practical applications. Advancing the design and control of non-equilibrium phases requires the development of targeted strategies to achieve long-lived, metastable phases. Here we report the discovery of symmetry-protected electronic metastability in the model cuprate ladder Sr14Cu24O41. Using femtosecond resonant X-ray scattering and spectroscopy, we show that this metastability is driven by a transfer of holes from chain-like charge reservoirs into the ladders. This ultrafast charge redistribution arises from the optical dressing and activation of a hopping pathway that is forbidden by symmetry at equilibrium. Relaxation back to the ground state is, hence, suppressed after the pump coherence dissipates. Our findings highlight how dressing materials with electromagnetic fields can dynamically activate terms in the electronic Hamiltonian, and provide a rational design strategy for non-equilibrium phases of matter.	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
B18-Core EXAFS	Enhanced performance in transparent conducting materials at the interface of a wide band gap semiconductor and a correlated metal Jessica L. Stoner , Troy D. Manning , Matthew J. Rosseinsky , Jonathan Alaria , Maria Batuk , Matthew S. Dyer , Joke Hadermann Materials Horizons DOI: 10.1039/D5MH00283D Diamond Proposal Number(s): [31218] Open Access Show Abstract ▼ Abstract: Several classes of inorganic transparent conducting coatings are available (broad band wide band gap semiconductors, noble metals, amorphous oxides and correlated metals), with peak performance depending on the layer thickness. Correlated metallic transition metal oxides have emerged as potential competitive materials for small coating thicknesses, but their peak performance remains one order of magnitude below other best in class materials. By exploiting the charge transfer at the interface between a correlated metal (SrNbO3) and a wide band gap semiconductor (SrTiO3), we show that pulsed laser deposition-grown SrNbO3 heterostructures on SrTiO3 outperform correlated metals by an order of magnitude. The apparent increase in carrier concentration confirms that an electronically active interfacial layer is contributing to the transport properties of the heterostructure. The correlated metallic electrode allows the extraction of high mobility carriers resulting in an enhanced conductivity for heterostructures with thicknesses up to 20 nm. The high optical absorption of the high mobility metallic interface does not have a detrimental effect on the transmission of the heterostructure due to its small thickness. The charge transfer-driven enhanced electrical properties in correlated metal - wide band gap semiconductor heterostructures offer a distinct route to high performance transparent conducting materials.	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

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