Studies on the interaction between two correlated electronic bands. I. Phase transition in NiS

1980 ◽  
Vol 373 (1753) ◽  
pp. 253-268 ◽  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Density Of States ◽  
Magnetic Phase ◽  
Magnetic Phase Transitions ◽  
Temperature Dependent ◽  
Interacting Electrons

An expression for the density of states of two electronic bands with intraand inter-band correlations has been derived. The consequences of the inter-band interaction on Mott-Hubbard split bands are discussed. The model is applied to explain the metal, semi-metal and magnetic phase transitions in NiS by using a semi-elliptical form for the density of states of non-interacting electrons. It is shown that the temperature-dependent overlap and hybridization parameters between d- and p-bands can provoke both the phase transitions in NiS as pointed out earlier by White & Mott (1971)

Spin-manipulated phonon dynamics during magnetic phase transitions in triangular lattice antiferromagnet CuCr1−xMgxO2 semiconductor films

RSC Advances ◽  
2016 ◽  
Vol 6 (32) ◽  
pp. 27136-27142 ◽  
Author(s):  
Xurui Li ◽  
Junyong Wang ◽  
Jinzhong Zhang ◽  
Yawei Li ◽  
Zhigao Hu ◽  
...  
Keyword(s):  
Phase Transitions ◽  
First Principles ◽  
Magnetic Phase ◽  
Magnetic Phase Transitions ◽  
First Principles Calculations ◽  
Semiconductor Films ◽  
Temperature Dependent ◽  
Phonon Spectra ◽  
Phonon Dynamics ◽  
Triangular Lattice Antiferromagnet

The temperature-dependent phonon spectra and magnetoresistance of CuCr1−xMgxO2 films have been studied, combined with first-principles calculations.

Deuterium substitution effects on the structural and magnetic phase transitions of a hydrogen-bonded coordination polymer, bis(glycolato)copper(ii)

2016 ◽  
Vol 45 (42) ◽  
pp. 16774-16778 ◽  
Author(s):  
Shota Yoneyama ◽  
Takeshi Kodama ◽  
Koichi Kikuchi ◽  
Takumi Fujisawa ◽  
Akira Yamaguchi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Transition Temperature ◽  
Magnetic Phase ◽  
Structural Phase ◽  
Magnetic Phase Transitions ◽  
Substitution Effects ◽  
Hydroxyl Groups ◽  
Large Shift ◽  
Deuterium Substitution

Bis(glycolato)copper(ii) [Cu(HOCH2CO2)2] shows a large shift of the structural phase transition temperature by deuterium substitution of the hydroxyl groups in it.

FIRST-ORDER MAGNETIC PHASE TRANSITIONS AND COLOSSAL MAGNETORESISTANCE: JOINING MANGANESE PEROVSKITES AND MnAs

2004 ◽  
Vol 18 (15) ◽  
pp. 725-747 ◽  
Author(s):  
J. MIRA ◽  
J. RIVAS
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Magnetic Phase Transition ◽  
Colossal Magnetoresistance ◽  
Magnetic Phase ◽  
Magnetic Phase Transitions ◽  
Colossal Magnetoresistive ◽  
First Order ◽  
First Order Transition ◽  
Magnetoresistive Effect

We revise some recent results on the nature of the magnetic phase transition of ferromagnetic manganese perovskites with colossal magnetoresistance. It is found that they exhibit first-order magnetic phase transitions mainly due to strong lattice effects. The presence of such first-order transition is strongly linked to the existence of a temperature region above the Curie Temperature with a phase-separated regime of coexisting metallic and insulating clusters. This situation is compared with that of MnAs , paradigm of system with first-order magnetic phase transition, and we observe a parallel phenomenology of these apparently different systems. This serves as a clue for the finding of a phase-separated regime also in MnAs and, moreover, for the finding of a colossal magnetoresistive effect similar to that of manganese perovskites.

scholarly journals Магнитострикционные аномалии редкоземельных фаз Лавеса c морфотропным фазовым переходом

2020 ◽  
Vol 62 (6) ◽  
pp. 839
Author(s):  
Г.А. Политова ◽  
М.А. Ганин ◽  
А.Б. Михайлова ◽  
А.В. Филимонов
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Phase Boundary ◽  
Magnetic Phase ◽  
Magnetic Phase Transitions ◽  
Multicomponent Systems ◽  
Laves Phases ◽  
Cubic Lattice ◽  
Morphotropic Phase Transition

Оver recent years in the process of searching for compounds with high or almost zero magnetostriction values, a number of pseudo-binary Laves RT2 phases with morphotropic phase transitions are attracted particular attention. That is, systems of compounds with a morphotropic phase boundary in the phase diagram. In this paper, the magnetic and magnetostrictive properties of multicomponent systems of compounds Tb0.2Dy0.8-хGdxCo2 and Tb0.2Dy0.8-хGdxCo1.9Al0.1 in which a morphotropic phase transition is observed when replacing dysprosium with gadolinium have been studied. A relationship between the temperature behavior, the sign and magnitude of magnetostrictive deformations, and the type of distortion of the cubic lattice of the studied Laves phases is revealed. In the region of magnetic phase transitions, the magnetocaloric effect was investigated.

scholarly journals Magnetic phase transitions in Eu( Co1−xNix)2−yAs2 single crystals

2020 ◽  
Vol 4 (8) ◽  
Author(s):  
N. S. Sangeetha ◽  
Santanu Pakhira ◽  
D. H. Ryan ◽  
V. Smetana ◽  
A.-V. Mudring ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Single Crystals ◽  
Magnetic Phase ◽  
Magnetic Phase Transitions
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