scholarly journals Long-range-ordered phase in a quantum Heisenberg chain with interactions beyond nearest neighbors

2021 ◽  
Vol 104 (1) ◽  
Author(s):  
Zehan Li ◽  
Sayan Choudhury ◽  
W. Vincent Liu
Keyword(s):  
Long Range ◽  
Nearest Neighbors ◽  
Heisenberg Chain

scholarly journals Defect-induced ferromagnetism in a S=1/2 quasi-one-dimensional Heisenberg antiferromagnetic chain compound

2021 ◽  
Author(s):  
Zhe Wang ◽  
Lin Hu ◽  
Langsheng Lin ◽  
Yuyan Han ◽  
Ning Hao ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Long Range ◽  
Metal Organic Framework ◽  
Heisenberg Chain ◽  
Saturation Field ◽  
One Dimensional ◽  
Metal Organic ◽  
Magnetic Features ◽  
Low Dimensional ◽  
Chain Compound

Abstract We present evidences that defects in the spin S=1/2 Heisenberg antiferromagnetic chain (HAFC) compound can lead to ferromagnetism by studying the magnetic and thermal properties of the newly discovered quasi-one-dimensional (1D) metal-organic framework [CH 3 NH 3 ][Cu(HCOO) 3 ] (MACuF). Our findings suggest that the long-range ferromagnetic order at 3.7 K can be attributed to Cu 2+ ions from the 2D networks constructed by the endpoints of the broken chains. It is worth mentioning that the ferromagnetic saturation field is less than 5 Oe. In such a case, the intrinsic magnetism can emerge in this quasi-1D Heisenberg chain system at the background of the anti-ferromagnetism. This unusual ferromagnetism found in HAFC not only enriches magnetic features in the low-dimensional systems, but helps to understand some of the exotic magnetic phenomena in other real quasi-1D magnetic materials.

scholarly journals Defect-induced ferromagnetism in a S = 1/2 quasi-one-dimensional Heisenberg antiferromagnetic chain compound

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhe Wang ◽  
Lin Hu ◽  
Langsheng Lin ◽  
Yuyan Han ◽  
Ning Hao ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Long Range ◽  
Short Range ◽  
Metal Organic Framework ◽  
Heisenberg Chain ◽  
One Dimensional ◽  
Metal Organic ◽  
Magnetic Features ◽  
Low Dimensional ◽  
Chain Compound

AbstractWe present evidences that defects in the spin S = 1/2 Heisenberg antiferromagnetic chain (HAFC) compound can lead to ferromagnetism by studying the magnetic and thermal properties of the newly discovered quasi-one-dimensional (1D) metal–organic framework [CH3NH3][Cu(HCOO)3] (MACuF). Our findings suggest that the long-range ferromagnetic order at 3.7 K can be attributed to Cu2+ ions from the 2D networks constructed by the endpoints of the broken chains. In such a case, the intrinsic magnetism can emerge in this quasi-1D Heisenberg chain system at the background of the short-range antiferromagnetism. This unusual ferromagnetism found in HAFC not only enriches magnetic features in the low-dimensional systems, but helps to understand some of the exotic magnetic phenomena in other real quasi-1D magnetic materials.

scholarly journals Phase transition and monopole densities in a nearest neighbor two-dimensional spin ice model

2017 ◽  
Vol 31 (31) ◽  
pp. 1750237
Author(s):  
C. W. Morais ◽  
D. N. De Freitas ◽  
A. L. Mota ◽  
E. C. Bastone
Keyword(s):  
Phase Transition ◽  
Long Range ◽  
Ground State ◽  
Nearest Neighbor ◽  
Nearest Neighbors ◽  
Dipolar Interaction ◽  
Effective Model ◽  
Two Dimensional ◽  
Spin Ice ◽  
Ice Model

In this work, we show that, due to the alternating orientation of the spins in the ground state of the artificial square spin ice, the influence of a set of spins at a certain distance of a reference spin decreases faster than the expected result for the long range dipolar interaction, justifying the use of the nearest neighbor two-dimensional square spin ice model as an effective model. Using an extension of the model presented in Y. L. Xie et al., Sci. Rep. 5, 15875 (2015), considering the influence of the eight nearest neighbors of each spin on the lattice, we analyze the thermodynamics of the model and study the dependence of monopoles and string densities as a function of the temperature.

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