scholarly journals Mean-field transfer-matrix study of the magnetic phase diagram ofCsNiF3

1995 ◽  
Vol 51 (9) ◽  
pp. 5868-5874 ◽  
Author(s):  
Y. Trudeau ◽  
M. L. Plumer
Keyword(s):  
Phase Diagram ◽  
Transfer Matrix ◽  
Magnetic Phase ◽  
Mean Field ◽  
Magnetic Phase Diagram

The Magnetic Phase Diagram of High Tc Superconductors

MRS Bulletin ◽  
1990 ◽  
Vol 15 (6) ◽  
pp. 50-54 ◽  
Author(s):  
A.P. Malozemoff
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Phase Diagram ◽  
Magnetic Phase ◽  
Mean Field ◽  
Magnetic Phase Diagram ◽  
Transition Line ◽  
Type Ii ◽  
Field Phase ◽  
Type Ii Superconductor

Among the many surprises in the held of high temperature superconductivity, new features discovered in the magnetic phase diagram are among the most exciting and controversial, generating many new physical concepts and impacting practical applications. This brief review complements several other recent reviews and refers mostly to the bulk crystal (not ceramic) Y1Ba2Cu3O7 and Bi2Sr2Ca1Cu2Ox materials, from now on denoted YBaCuO and BiSrCaCuO.The magnetic phase diagram of a conventional type II superconductor as a function of magnetic held H and temperature T is well known and understood in the mean-field Ginzburg-Landau and London theories. As shown in Figure 1a, a Meissner phase characterized by complete flux exclusion appears at low fields, delineated by a mean-field phase transition line called the lower critical field Hc1(T), which increases linearly with decreasing temperature below Tc and then saturates at low temperature. A second mean-field phase transition line, called the upper critical field Hc2(T), delineates the transition between the normal and superconducting states and shows a T-dependence similar to Hc1(T). In a strongly type II superconductor (in which the penetration depth λ is much larger than the coherence length ξ), the large region intervening between Hc1 and Hc2 is called the Abrikosov mixed phase. Here magnetic field penetrates the superconductor in the form of tubes of magnetic field called flux lines or vortices. In an ideal isotropic superconductor, these vortices self-organize into a hexagonal array. Defects disturb the hexagonal long-range order, causing the array to break up into a kind of glassy state with more or less short-range order.

scholarly journals Spin State Switching in Heptauthrene Nanostructure by Electric Field: Computational Study

2021 ◽  
Vol 22 (24) ◽  
pp. 13364
Author(s):  
Karol Szałowski
Keyword(s):  
Phase Diagram ◽  
Electric Field ◽  
Spin State ◽  
Magnetic Phase ◽  
Computational Study ◽  
Experimental Studies ◽  
Mean Field ◽  
Magnetic Phase Diagram ◽  
Zigzag Edge ◽  
Spin Distribution

Recent experimental studies proved the presence of the triplet spin state in atomically precise heptauthrene nanostructure of nanographene type (composed of two interconnected triangles with zigzag edge). In the paper, we report the computational study predicting the possibility of controlling this spin state with an external in-plane electric field by causing the spin switching. We construct and discuss the ground state magnetic phase diagram involving S=1 (triplet) state, S=0 antiferromagnetic state and non-magnetic state and predict the switching possibility with the critical electric field of the order of 0.1 V/Å. We discuss the spin distribution across the nanostructure, finding its concentration along the longest zigzag edge. To model our system of interest, we use the mean-field Hubbard Hamiltonian, taking into account the in-plane external electric field as well as the in-plane magnetic field (in a form of the exchange field from the substrate). We also assess the effect of uniaxial strain on the magnetic phase diagram.

NEUTRON DIFFRACTION AND MAGNETIZATION STUDY OF THE MAGNETIC PHASE DIAGRAM OF UAs0.75Se0.25 SINGLE CRYSTAL

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-479-C8-480 ◽  
Author(s):  
M. Kuznietz ◽  
P. Burlet ◽  
J. Rossat-Mignod ◽  
O. Vogt ◽  
K. Mattenberger ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Magnetization Study

MAGNETIC PROPERTIES OF PSEUDO-BINARY Mn1−xFexSn2 ALLOYS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 867-870 ◽  
Author(s):  
H. SHIRAISHI ◽  
T. HORI ◽  
Y. YAMAGUCHI ◽  
S. FUNAHASHI ◽  
K. KANEMATSU
Keyword(s):  
Field Theory ◽  
Phase Diagram ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
High Temperature ◽  
Magnetic Structure ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Molecular Field ◽  
Magnetic Phases

The magnetic susceptibility measurements have been made on antiferromagnetic compounds Mn1–xFexSn2 and the magnetic phase diagram was illustrated. The high temperature magnetic phases I and III, major phases, were analyzed on the basis of molecular field theory and explained the change of magnetic structure I⇌III occured at x≈0.8.

scholarly journals Magnetism and magnetic phase diagram of sigma-phase Fe68V32 compound

2021 ◽  
Vol 132 ◽  
pp. 107134
Author(s):  
Piotr Konieczny ◽  
Stanisław M. Dubiel
Keyword(s):  
Phase Diagram ◽  
Sigma Phase ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram
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