Explore the vast range of titles available.

Strongly correlated materials respond sensitively to external perturbations such as strain, pressure, and doping. In the recently discovered superconducting infinite-layer nickelates, the superconducting transition temperature can be enhanced via only ~ 1% compressive strain-tuning with the root of such enhancement still being elusive. Using resonant inelastic x-ray scattering (RIXS), we investigate the magnetic excitations in infinite-layer PrNiO 2 thin films grown on two different substrates, namely SrTiO 3 (STO) and (LaAlO 3 ) 0.3 (Sr 2 TaAlO 6 ) 0.7 (LSAT) enforcing different strain on the nickelates films. The magnon bandwidth of PrNiO 2 shows only marginal response to strain-tuning, in sharp contrast to the enhancement of the superconducting transition temperature T c in the doped superconducting samples. These results suggest the bandwidth of spin excitations of the parent compounds is similar under strain while T c in the doped ones is not, and thus provide important empirics for the understanding of superconductivity in infinite-layer nickelates. Nickelates have been shown to host unconventional superconductivity, and recently it has been found that the choice of substrate can significantly change the superconducting critical temperature. This suggests, that like some Cuprates, strain could be important. Here Gao, Fan, Wang, and coauthors find that magnetic excitations in a parent Nickelate are insensitive to substrate choice, and therefore strain, which differs markedly from the case of Cuprates.

Multi-band Mott insulators with moderate spin-orbit and Hund’s coupling are key reference points for theoretical concept developments of correlated electron systems. The ruthenate Mott insulator Ca 2 RuO 4 has therefore been intensively studied by spectroscopic probes. However, it has been challenging to resolve the fundamental excitations emerging from the hierarchy of electronic energy scales. Here we apply high resolution resonant inelastic x-ray scattering to probe deeper into the low-energy electronic excitations found in Ca 2 RuO 4 . In this fashion, we probe a series of spin-orbital excitations. By taking advantage of enhanced energy resolution, we probe a 40 meV mode through the oxygen K -edge. The polarization dependence of this low-energy excitations exposes a distinct orbital nature, originating from the interplay of spin-orbit coupling and octahedral rotations. Additionally, we discuss the role of magnetic correlations to describe the occurrence of excitations with amplitudes which are multiple of a given energy. Such direct determination of relevant electronic energy scales sharpens the target for theory developments of Mott insulators’ orbital degree of freedom. Spin orbit coupling (SOC) is a feature crucial to many interesting physics phenomena ranging from Mott insulators to topological insulators. Here, the authors use resonant inelastic X-ray scattering to study the low-energy excitations of the Mott insulator, Ca2RuO4, and reveal the orbital character of the magnetic properties of the system.

Strongly correlated materials respond sensitively to external perturbations such as strain, pressure, and doping. In the recently discovered superconducting infinite-layer nickelates, the superconducting transition temperature can be enhanced via only ~ 1% compressive strain-tuning with the root of such enhancement still being elusive. Using resonant inelastic x-ray scattering (RIXS), we investigate the magnetic excitations in infinite-layer PrNiO thin films grown on two different substrates, namely SrTiO (STO) and (LaAlO ) (Sr TaAlO ) (LSAT) enforcing different strain on the nickelates films. The magnon bandwidth of PrNiO shows only marginal response to strain-tuning, in sharp contrast to the enhancement of the superconducting transition temperature T in the doped superconducting samples. These results suggest the bandwidth of spin excitations of the parent compounds is similar under strain while T in the doped ones is not, and thus provide important empirics for the understanding of superconductivity in infinite-layer nickelates.

Strongly correlated materials often respond sensitively to the external perturbations. In the recently discovered superconducting infinite-layer nickelates, the superconducting transition temperature can be dramatically enhanced via only ~1% compressive strain-tuning enabled by substrate design. However, the root of such enhancement remains elusive. While the superconducting pairing mechanism is still not settled, magnetic Cooper pairing - similar to the cuprates has been proposed. Using resonant inelastic x-ray scattering, we investigate the magnetic excitations in infinite-layer PrNiO2 thin films for different strain conditions. The magnon bandwidth of PrNiO2 shows only marginal response to strain-tuning, in sharp contrast to the striking enhancement of the superconducting transition temperature Tc in the doped superconducting samples. These results suggest the enhancement of Tc is not mediated by spin excitations and thus provide important empirics for the understanding of superconductivity in infinite-layer nickelates.

It is unclear whether radial compared with femoral access improves outcomes in unselected patients with acute coronary syndromes undergoing invasive management. We did a randomised, multicentre, superiority trial comparing transradial against transfemoral access in patients with acute coronary syndrome with or without ST-segment elevation myocardial infarction who were about to undergo coronary angiography and percutaneous coronary intervention. Patients were randomly allocated (1:1) to radial or femoral access with a web-based system. The randomisation sequence was computer generated, blocked, and stratified by use of ticagrelor or prasugrel, type of acute coronary syndrome (ST-segment elevation myocardial infarction, troponin positive or negative, non-ST-segment elevation acute coronary syndrome), and anticipated use of immediate percutaneous coronary intervention. Outcome assessors were masked to treatment allocation. The 30-day coprimary outcomes were major adverse cardiovascular events, defined as death, myocardial infarction, or stroke, and net adverse clinical events, defined as major adverse cardiovascular events or Bleeding Academic Research Consortium (BARC) major bleeding unrelated to coronary artery bypass graft surgery. The analysis was by intention to treat. The two-sided α was prespecified at 0·025. The trial is registered at ClinicalTrials.gov, number NCT01433627. We randomly assigned 8404 patients with acute coronary syndrome, with or without ST-segment elevation, to radial (4197) or femoral (4207) access for coronary angiography and percutaneous coronary intervention. 369 (8·8%) patients with radial access had major adverse cardiovascular events, compared with 429 (10·3%) patients with femoral access (rate ratio [RR] 0·85, 95% CI 0·74–0·99; p=0·0307), non-significant at α of 0·025. 410 (9·8%) patients with radial access had net adverse clinical events compared with 486 (11·7%) patients with femoral access (0·83, 95% CI 0·73–0·96; p=0·0092). The difference was driven by BARC major bleeding unrelated to coronary artery bypass graft surgery (1·6% vs 2·3%, RR 0·67, 95% CI 0·49–0·92; p=0·013) and all-cause mortality (1·6% vs 2·2%, RR 0·72, 95% CI 0·53–0·99; p=0·045). In patients with acute coronary syndrome undergoing invasive management, radial as compared with femoral access reduces net adverse clinical events, through a reduction in major bleeding and all-cause mortality. The Medicines Company and Terumo.

In 7213 patients with an acute coronary syndrome, the rate of major adverse cardiovascular events was not significantly lower with bivalirudin than with heparin. Post-PCI bivalirudin infusion did not reduce the risk of stent thrombosis. The most effective antithrombotic regimen for preventing ischemic complications while limiting bleeding risk in patients with an acute coronary syndrome who are undergoing invasive treatment remains unknown. 1 – 3 Two of the most commonly used antithrombotic regimens worldwide 4 , 5 are unfractionated heparin, an indirect thrombin inhibitor, with or without the concomitant use of a glycoprotein IIb/IIIa inhibitor, and bivalirudin, a direct thrombin inhibitor, with a glycoprotein IIb/IIIa inhibitor added only for periprocedural ischemic complications. Previous studies that have compared these two options among patients who were undergoing invasive treatment for an acute coronary syndrome have provided conflicting results with respect to . . .

We aimed to compare differences in risk and timing of recurrent ischemic events among patients with stable ischemic heart disease (SIHD), non–ST-segment elevation acute coronary syndrome (NSTE-ACS), and ST-segment elevation myocardial infarction (STEMI) undergoing percutaneous coronary intervention (PCI). We performed an individual data pooled analysis of 5 randomized controlled all-comer trials including a total of 8,859 patients and investigated the risk and timing of recurrent ischemic events among patients with SIHD (n = 3,543), NSTE-ACS (n = 3,364), and STEMI (n = 1,952) throughout 2 years of follow-up. At 2 years, all-cause mortality was higher among patients with STEMI (6.4%) and NSTE-ACS (6.1%) compared with those with SIHD (4.2%) (STEMI vs SIHD: hazard ratio [HR] 1.40, 95% CI 1.09-1.78, P = .007; NSTE-ACS vs SIHD: 1.40, 95% CI 1.13-1.73, P = .002). In a landmark analysis, the risk of mortality among patients with STEMI compared with those with SIHD was confined to the first 30 days after PCI (HR 6.19, 95% CI 3.15-12.16, P < .001) but was similar between 30 days and 2 years (HR 1.00, 95% CI 0.76-1.33, P = .974) (Pinteraction < .001). Conversely, patients with NSTE-ACS had a higher risk of mortality compared with those with SIHD both within the first 30 days (HR 2.19, 95% CI 1.08-4.47, P = .031) and beyond (HR 1.34, 95% CI 1.07-1.67, P = .012) (Pinteraction < .001). A similar pattern in the differential timing of events was observed for cardiac death. Beyond 30 days, the risk of myocardial infarction was comparable in patients with STEMI and SIHD, whereas the risk in patients with NSTE-ACS was increased (HR 1.65, 95% CI 1.23-2.21, P = .001). Whereas patients with NSTE-ACS are at increased risk for death at any time after PCI, the mortality of STEMI patients is higher during the first 30 days after PCI but not thereafter compared with patients with SIHD.