scholarly journals Robust noncoplanar magnetism in band-filling-tuned ( Nd1−xCax)2Mo2O7

2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Max Hirschberger ◽  
Yoshio Kaneko ◽  
Leonie Spitz ◽  
Taro Nakajima ◽  
Yasujiro Taguchi ◽  
...  
Keyword(s):  
Band Filling

scholarly journals Importance of $${{d}}_{{{xy}}}$$ orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tsuyoshi Kawashima ◽  
Shigeki Miyasaka ◽  
Hirokazu Tsuji ◽  
Takahiro Yamamoto ◽  
Masahiro Uekubo ◽  
...  
Keyword(s):  
Electron Correlation ◽  
Weak Coupling ◽  
Structural Parameters ◽  
Structural Flexibility ◽  
Superconducting Transition ◽  
Iron Based Superconductors ◽  
Wide Range ◽  
Band Filling ◽  
Iron Based ◽  
Correlation Strength

AbstractThe structural flexibility at three substitution sites in LaFeAsO enabled investigation of the relation between superconductivity and structural parameters over a wide range of crystal compositions. Substitutions of Nd for La, Sb or P for As, and F or H for O were performed. All these substitutions modify the local structural parameters, while the F/H-substitution also changes band filling. It was found that the superconducting transition temperature $$T_{\text{c}}$$ T c is strongly affected by the pnictogen height $$h_{Pn}$$ h Pn from the Fe-plane that controls the electron correlation strength and the size of the $$d_{xy}$$ d xy hole Fermi surface (FS). With increasing $$h_{Pn}$$ h Pn , weak coupling BCS superconductivity switches to the strong coupling non-BCS one where electron correlations and the $$d_{xy}$$ d xy hole FS may be important.

scholarly journals Three dimensional band-filling control of complex oxides triggered by interfacial electron transfer

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Meng Meng ◽  
Yuanwei Sun ◽  
Yuehui Li ◽  
Qichang An ◽  
Zhenzhen Wang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Field Effect ◽  
Essential Role ◽  
Field Effect Transistors ◽  
Three Dimensional ◽  
Complex Oxides ◽  
Band Filling ◽  
Local Lattice ◽  
Oxygen Migration ◽  
Oxide Heterostructure

AbstractThe d-band-filling of transition metals in complex oxides plays an essential role in determining their structural, electronic and magnetic properties. Traditionally, at the oxide heterointerface, band-filling control has been achieved via electrostatic modification in the structure of field-effect transistors or electron transfer, which is limited to the quasi-two-dimension at the interface. Here we report a three-dimensional (3D) band-filling control by changing the local lattice coordination in a designed oxide heterostructure. At the LaCoO3/LaTiO3 heterointerface, due to the Fermi level mismatch, electrons transfer from LaTiO3 to LaCoO3. This triggers destabilisation of the CoO6 octahedrons, i.e. the formation of lattice configurations with a reduced Co valence. The associated oxygen migration results in the 3D topotactic phase transition of LaCoO3. Tuned by the thickness of LaTiO3, different crystalline phases and band-fillings of Co occur, leading to the emergence of different magnetic ground states.

scholarly journals Zum paramagnetischen Verhalten von Palladium/Silber/Eisen- Legierungen/ On the Paramagnetic Behaviour of Palladium-Silver-Iron Alloys

1975 ◽  
Vol 30 (5) ◽  
pp. 645-655
Author(s):  
Peter Brill
Keyword(s):  
Electron Concentration ◽  
Magnetic Moments ◽  
Alloy Series ◽  
Band Filling ◽  
Paramagnetic Behaviour ◽  
Field Coefficient ◽  
Saturation Moment ◽  
Molecular Field Coefficient ◽  
The Moment ◽  
Curie Temperatures

Abstract The paramagnetic susceptibility of four PdAgFe alloy series containing 1, 3, 5 and 7 at. % Fe have been measured between 20° and 150 °C. On the basis of a band filling model the local moment contribution to the susceptibility has been evaluated according to a Curie -Weiss law. Assuming that the iron atoms donate 3 electrons and the silver atoms 1 electron to the Pd 4d band, the effective magnetic moments and the paramagnetic Curie temperatures of all the alloys can be represented by a single curve against the electron concentration. The effective magnetic moment is consistent with an Fe moment of 5.92 μB localized on the iron sites and a Pd moment varying with electron concentration and temperature. The same turns out to be true for the ferromagnetic region where the saturation moment, obtained on PdFe alloys and a PdAgFe alloy by different authors, is considered to arise from a localized Fe moment of 5 μB and a concentration dependent Pd moment. The molecular field coefficient for the interaction between the Fe moments and the Pd 4d electrons is found to be 850 mol/cm3 at 385 K and 1200 mol/cm3 at 0 K. Finally, the iron moment suggested in this work is contrasted with the moment derived from neutron diffraction measurements.

Very high sensitivity optical modulators based on band filling effect in GaInAs quantum wells

1990 ◽  
Author(s):  
T.Y. Chang ◽  
J.E. Zucker ◽  
K.L. Jones ◽  
N.J. Sauer ◽  
B. Tell ◽  
...  
Keyword(s):  
Quantum Wells ◽  
High Sensitivity ◽  
Optical Modulators ◽  
Band Filling ◽  
Very High

Regenerative pulsations in semiconductor etalon due to competition between carrier generation and heating effects on band filling

1997 ◽  
Vol 82 (5) ◽  
pp. 2023-2030 ◽  
Author(s):  
Valery I. Tolstikhin ◽  
Alexander V. Grigor’yants ◽  
Theo G. van de Roer
Keyword(s):  
Carrier Generation ◽  
Heating Effects ◽  
Band Filling

Band filling in p-doped InAs quantum dot lasers

2011 ◽  
Author(s):  
M. Hutchings ◽  
I. O’Driscoll ◽  
P. M. Smowton ◽  
P. Blood
Keyword(s):  
Quantum Dot ◽  
Quantum Dot Lasers ◽  
Band Filling ◽  
Inas Quantum Dot

PHASE SEPARATION IN THE TWO-DIMENSIONAL HUBBARD MODEL

2005 ◽  
Vol 19 (01n03) ◽  
pp. 299-302 ◽  
Author(s):  
M. YU ◽  
H. Q. LIN
Keyword(s):  
Phase Separation ◽  
Hubbard Model ◽  
Coulomb Interaction ◽  
Single Band ◽  
Study Phase ◽  
Two Dimensional ◽  
Stripe Phase ◽  
Hartree Fock ◽  
Band Filling

In this paper, we study phase separation in the two-dimensional single-band Hubbard model with the unrestricted Hartree-Fock(UHF) method and the restricted Hartree-Fock (RHF) method. We perform the calculation for square lattices and rectangle lattices. It is observed that the stripe phase exists and it depends on three aspects: geometry of the lattice, Coulomb interaction U and band filling n. To gain more physical insights, we consider the Hubbard model with spin dependent hoppings: t↑ and t↓, and study the effect of varying [Formula: see text] on the phase separation.

scholarly journals Precise Control of Band Filling in NaxCoO2

2007 ◽  
Vol 76 (6) ◽  
pp. 063705 ◽  
Author(s):  
Daisuke Yoshizumi ◽  
Yuji Muraoka ◽  
Yoshihiko Okamoto ◽  
Yoko Kiuchi ◽  
Jun-Ichi Yamaura ◽  
...  
Keyword(s):  
Precise Control ◽  
Band Filling
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