scholarly journals Magnetic-charge ordering and phase transitions in monopole-conserved square spin ice

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Y.-L. Xie ◽  
Z.-Z. Du ◽  
Z.-B. Yan ◽  
J.-M. Liu
Keyword(s):  
Phase Transitions ◽  
Magnetic Charge ◽  
Charge Ordering ◽  
Spin Ice

scholarly journals Real-space imaging of phase transitions in bridged artificial kagome spin ice

2021 ◽  
Author(s):  
Kevin Hofhuis ◽  
Sandra Skjærvø ◽  
Sergii Parchenko ◽  
Hanu Arava ◽  
Zhaochu Luo ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Near Field ◽  
Real Space ◽  
Spin Systems ◽  
Charge Ordering ◽  
Magnetic Phase Transitions ◽  
Global Symmetry ◽  
Temperature Phase ◽  
Spin Ice ◽  
Two Phase

Abstract In frustrated spin systems, magnetic phase transitions underpin the formation of exotic, frustration-driven magnetic phases. Of great importance is the ability to manipulate these transitions to access specific phases, which in turn provides a means to discover and control novel phenomena. Artificial spin systems, incorporating lithographically-fabricated arrays of dipolar-coupled nanomagnets that allow real-space observation of the magnetic configurations, provide such an opportunity. In particular, the kagome spin ice is predicted to have two phase transitions, one of which is to a low temperature phase whose long-range ground state order has not been observed experimentally. To achieve this order, we change the global symmetry of the artificial kagome system, by selectively tuning the near-field nanomagnet interactions through nanoscale bridges at the vertices. By precisely tuning the interactions, we can quantify the influence of frustration on such a transition, and find that the driving force for spin and charge ordering depends on the degeneracy strength at the vertex. For the first time, we are able to observe the evolution of the magnetic configurations associated with a phase transition in real space and time.

scholarly journals Imaging the formation and surface phase separation of the CE phase

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Haibiao Zhou ◽  
Qiyuan Feng ◽  
Yubin Hou ◽  
Masao Nakamura ◽  
Yoshinori Tokura ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transitions ◽  
Charge Ordering ◽  
Zero Magnetic Field ◽  
Ferromagnetic Phase ◽  
Emergent Properties ◽  
Orbital Ordering ◽  
Strong Electron ◽  
Antiferromagnetic Correlation ◽  
Ordering Transitions

AbstractThe CE phase is an extraordinary phase exhibiting the simultaneous spin, charge, and orbital ordering due to strong electron correlation. It is an ideal platform to investigate the role of the multiple orderings in the phase transitions and discover emergent properties. Here, we use a cryogenic high-field magnetic force microscope to image the phase transitions and properties of the CE phase in a Pr0.5Ca0.5MnO3 thin film. In a high magnetic field, we observed a clear suppression of magnetic susceptibility at the charge-ordering insulator transition temperature (TCOI), whereas, at the Néel temperature (TN), no significant change is observed. This observation favors the scenario of strong antiferromagnetic correlation developed below TCOI but raises questions about the Zener polaron paramagnetic phase picture. Besides, we discoverd a phase-separated surface state in the CE phase regime. Ferromagnetic phase domains residing at the surface already exist in zero magnetic field and show ultra-high magnetic anisotropy. Our results provide microscopic insights into the unconventional spin- and charge-ordering transitions and revealed essential attributes of the CE phase, highlighting unusual behaviors when multiple electronic orderings are involved.

scholarly journals Thermodynamics of emergent magnetic charge screening in artificial spin ice

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Alan Farhan ◽  
Andreas Scholl ◽  
Charlotte F. Petersen ◽  
Luca Anghinolfi ◽  
Clemens Wuth ◽  
...  
Keyword(s):  
Magnetic Charge ◽  
Spin Ice ◽  
Charge Screening ◽  
Artificial Spin Ice

Charge ordering and ferroelectric states in organic quasi-one-dimensional conductors

2002 ◽  
Vol 12 (9) ◽  
pp. 133-138
Author(s):  
F. Nad ◽  
P. Monceau
Keyword(s):  
Phase Transitions ◽  
Charge Ordering ◽  
Electron Interaction ◽  
Charge Symmetry ◽  
Low Frequencies ◽  
One Dimensional ◽  
Thermally Activated ◽  
Correlated Electron ◽  
Temperature Dependences ◽  
New Phase

In quasi-one-dimensional (TMTTF)2X conductors [1], where X are the various centro-symmetrical and non-centrosymmetrical anions, by study of temperature dependences of conductance G and dielectric permittivity $\varepsilon '$ at low frequencies we have found anomalies which are characteristic for phase transitions: an abrupt bend on the G(l/T) dependences with thermally activated decrease of G and sharp maxima of the E' near the charge ordering temperature corresponding to the E' divergence according to the Curie law. A number of evidences have been obtained in favor that driving force of these phase transitions is the long range correlated electron interaction yielding the charge ordering along the molecular chains (a lattice version of the Wigner crystal). The anion chains, electrically balanced with molecular chains, are of very importance in the formation and the stabilization of these new phase states. It appears that the form of charge symmetry of the anions determines to a great extent the types of the occurring transitions and the developing ground states.

Charge ordering and successive phase transitions of mixed-valence iron oxide GdBaFe2O5

2020 ◽  
Vol 282 ◽  
pp. 121069
Author(s):  
Daisuke Urushihara ◽  
Tomoki Matsumura ◽  
Kenta Nakajima ◽  
Koichiro Fukuda ◽  
Tomohiro Abe ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Iron Oxide ◽  
Mixed Valence ◽  
Charge Ordering ◽  
Successive Phase

scholarly journals Fragmentation in spin ice from magnetic charge injection

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
E. Lefrançois ◽  
V. Cathelin ◽  
E. Lhotel ◽  
J. Robert ◽  
P. Lejay ◽  
...  
Keyword(s):  
Magnetic Charge ◽  
Charge Injection ◽  
Spin Ice
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