655 research outputs found
UvA-DARE (Digital Academic Repository) Link to publication Citation for published version (APA)
No full textEffect of impurity phases on the anisotropic properties of CeNiSn Nakamoto, G.; Link to publication Citation for published version (APA): Nakamoto, G., Takabatake, T., Bando, Y., Fujii, H., Izawa, K., Suzuki, T., ... Menovsky, A. A. (1995). Effect of impurity phases on the anisotropic properties of CeNiSn. [206][207][840][841][842][843
The magnetic torque of the heavy-fermion Upd2Ga3
No full textThe magnetic torque of the heavy-fermion Upd2Ga3 Sullow, S.; Janossy, B.; van Vliet, G.E.L.; Nieuwenhuys, G.J.; Menovsky, A.A.; Mydosh, J.A. Published in: Journal of Physics-Condensed Matter DOI: 10.1088/0953-8984/8/6/013 Link to publication Citation for published version (APA): Sullow, S., Janossy, B., van Vliet, G. E. L., Nieuwenhuys, G. J., Menovsky, A. A., & Mydosh, J. A. (1996). The magnetic torque of the heavy-fermion Upd2Ga3. Journal of General rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Abstract. The basal-plane anisotropy of the antiferromagnetic phase of the hexagonal heavy-fermion superconductor UPd 2 Al 3 has been studied via the magnetic torque. Torque measurements were performed as functions of magnetic field and angle, with the field rotated in the a-b-plane, at temperatures between 4.2 and 30 K and in fields of up to 20 T. We interpret our results within a mean-field model and derive expressions for the basal-plane anisotropy energy. Further, we studied the anisotropy and temperature dependence of the metamagnetic transition of UPd 2 Al 3 at 18 T and we discuss its nature
Temperature dependence of the doping holes in lsco superconductor studied by polarized Cu L-X-ray absorption
No full textAn Acute Spinal Intradural Hematoma after an Extraforaminal Wiltse Approach: A Case Report and Review of the Literature
No full textA nontraumatic spontaneous spinal acute subdural hematoma (sSDH) is a rare complication after spinal surgery. Although an sSDH is often associated with anticoagulation therapy, vascular malformations, or lumbar puncture, the pathogenesis of nontraumatic spontaneous sSDH remains unclear. We present the case of an intradural hematoma after an extraforaminal surgery through the Wiltse approach for an extraforaminal disk herniation at L5/S1. This 58-year-old woman experienced hypoesthesia and progressive motor dysfunction in the left leg several hours postoperation. Urgent magnetic resonance imaging revealed an intradural hematoma at the L1/L2 to L2/L3 level in the ventral dural sac proximal to the surgical level. Surgical decompression was performed. There was no evidence of trauma, coagulopathy, or anticoagulation therapy. To our knowledge, this case is the first to report an acute sSDH proximal to the surgery level after an extraforaminal spinal surgery through the Wiltse approach for an extraforaminal disk herniation. It illustrates that attentive postoperative neurologic monitoring, even in the absence of intraoperative irregularities, remains important to diagnose and treat this complication at the early stage.Plazier, M (corresponding author), Jessa Hosp, Dept Neurosurg, Campus Virga Jesse, B-3500 Hasselt, Limburg, Belgium.
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Direct observation of the Zhang-Rice singlets in high-temperature superconductors
No full textFrom a spin-resolved photoemission study on the Bi2Sr2CaCu2O8+δ superconductor, we show experimentally that the first ionization state is of nearly pure singlet character. This is true both above and below the superconducting transition and in the presence of doping and band formation. This provides direct support for the existence and stability of Zhang-Rice singlets in high-temperature superconductors, justifying the ansatz of single-band models. Moreover, we establish this technique as an important probe for a wide range of cuprates and strongly correlated materials
The Out-of-Plane Cu 3d and O 2p Holes in the Bi2212 System
No full textThe polarisation dependent X-ray absorption measurements (XAS) have been made below the transition temperature of Bi2Sr2CaCu2O2+y (Bi2212) superconducting system. The results suggest a negligible amount of Cu 3dz2-r2 symmetry holes but give a strong evidence of presence of a significant amount of pz symmetry holes. The polarisation dependent Cu L3 and O K spectra are reported both in superconducting as well as in normal state of the Bi2212 system
Decrease of Itinerant Holes Near the Metal to Insulator Crossover in Superconducting La1.85Sr0.15CuO4
No full textPolarized Cu L-edge X-ray absorption spectra (XAS) measurements of the unoccupied electronic state of 3d(x)2-(y)2 symmetry in superconducting La1.85Sr0.15CuO4 Single crystals show a temperature dependent anomalous decrease of the density of itinerant holes below similar to 100 K. The anomalous temperature coincides with the temperature of the metal to insulator (MI) transition and local lattice distortions in the CuO2 plane. The results give direct evidence of decrease of itinerant states in the CuO2 plane due to local lattice distortions across the MI crossover in the normal state
Evidence of Redistribution of the Itinerant holes Below Tc in Bi2Sr2CaCu2O8 Superconductors: A Polarised X-ray Absorption Study
No full textThe microscopic electronic structure of high-quality superconducting Bi2Sr2CaCu2O8+y (Bi2212) single crystals has been investigated in the normal and superconducting states by polarized x-ray-absorption (XAS) measurements. The O K-edge XAS results led us to conclude the presence of a significant density of p(z) symmetry orbitals for itinerant holes. We observed a reproducible increase in the number of O 2p(x,y) itinerant holes accompanied by a decrease of the O K XAS transition in the upper Hubbard band (covalent holes) while going from the normal to the superconducting state of the system. The increase of O 2p,, holes was confirmed by an increase in the 3d(9)L/3d(9) ratio estimated from Cu L(3) XAS measurements. This is in agreement with earlier inverse photoemission measurements and constitutes evidence for the redistribution of the itinerant holes below the transition temperature (T-c)
Cerebral dural arteriovenous fistulae presenting with acute hemorrhage: A systematic review
No full textBackground: Cerebral dural arteriovenous fistulae (dAVFs) are rare connections between arteries and veins or sinuses in the brain. dAVFs have a higher risk of intracranial hemorrhages due to increased venous pressure. Endovascular treatment is considered the first line treatment. However, it is unknown if surgery improves outcomes for patients presenting with an acute hemorrhage. Therefore, this systematic review assesses complete obliterations and recurrences of surgery and endovascular treatment in hemorrhagic dAVFs patients.Methods: A literature search in the PubMed and Web of Sciences database was conducted up till October 2021. Studies of surgical and endovascular treatments with hemorrhagic dAVFs were included. The Quality Assessment Tool for Before-After (Pre-Post) Studies with No Control Group and the JBI critical appraisal checklist for case reports were used for risk of bias assessment.Results: Eleven articles were included. 681 dAVFs patients with 686 fistulae were reported. 245 (36 %) patients presented with an intracranial hemorrhage. Most fistulae were found in the transverse or sigmoid sinuses (n = 220; 32.1 %) and the majority were classified as Borden III. 571 endovascular treatments resulted in 390 (68.3 %) complete dAVF obliterations and there was a recurrence of 66 dAVFs (16.9 %). 183 surgeries resulted in the complete obliteration of 166 fistulae (91.8 %) with a recurrence of 2 dAVFs (1.2 %).Conclusions: Due to the lack of literature on hemorrhagic dAVFs exclusively, we cannot make a statement on the effectiveness of surgical interventions compared to endovascular treatments. Future studies should report out-comes based on location, previous treatments, and patient presentation
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