25 research outputs found
Correlation between Lower Urinary Tract Scoring System, Behavior Check List, and Bladder Sonography in Children with Lower Urinary Tract Symptoms
Anti-Competitive Practices by Private Undertakings in Ancom and Mercosur: An Analysis from the Perspective of EC Law
Specific behavioral comorbidity in a large sample of children with functional incontinence: Report of 1,001 cases
Understanding the activation of anionic redox chemistry in Ti\u2074+-substituted Li\u2082MnO\u2083 as a cathode material for Li-ion batteries
Role of body mass index in school-aged children with lower urinary tract dysfunction: Does weight classification predict treatment outcome?
Evidence of tetragonal distortion as the origin of the ferromagnetic ground state in γ -Fe nanoparticles
© 2017 American Physical Society. γ-Fe and related alloys are model systems of the coupling between structure and magnetism in solids. Since different electronic states (with different volumes and magnetic ordering states) are closely spaced in energy, small perturbations can alter which one is the actual ground state. Here, we demonstrate that the ferromagnetic state of γ-Fe nanoparticles is associated with a tetragonal distortion of the fcc structure. Combining a wide range of complementary experimental techniques, including low-temperature Mössbauer spectroscopy, advanced transmission electron microscopy, and synchrotron radiation techniques, we unambiguously identify the tetragonally distorted ferromagnetic ground state, with lattice parameters a=3.76(2)Å and c=3.50(2)Å, and a magnetic moment of 2.45(5) μB per Fe atom. Our findings indicate that the ferromagnetic order in nanostructured γ-Fe is generally associated with a tetragonal distortion. This observation motivates a theoretical reassessment of the electronic structure of γ-Fe taking tetragonal distortion into account.status: publishe
Evidence of tetragonal distortion as the origin of the ferromagnetic ground state in −Fe nanoparticles
−Fe and related alloys are model systems of the coupling between structure and magnetism in solids. Since different electronic states (with different volumes and magnetic ordering states) are closely spaced in energy, small perturbations can alter which one is the actual ground state. Here, we demonstrate that the ferromagnetic state of −Fe nanoparticles is associated with a tetragonal distortion of the fcc structure. Combining a wide range of complementary experimental techniques, including low-temperature Mössbauer spectroscopy, advanced transmission electron microscopy, and synchrotron radiation techniques, we unambiguously identify the tetragonally distorted ferromagnetic ground state, with lattice parameters a=3.76(2)Å and c=3.50(2)Å, and a magnetic moment of 2.45(5) μB per Fe atom. Our findings indicate that the ferromagnetic order in nanostructured −Fe is generally associated with a tetragonal distortion. This observation motivates a theoretical reassessment of the electronic structure of −Fe taking tetragonal distortion into account