{"id":75533,"date":"2020-09-25T20:34:11","date_gmt":"2020-09-25T17:34:11","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/antiferromagnet-lattice-arrangements-influence-phase-transitions\/"},"modified":"2020-09-25T20:34:11","modified_gmt":"2020-09-25T17:34:11","slug":"antiferromagnet-lattice-arrangements-influence-phase-transitions","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/antiferromagnet-lattice-arrangements-influence-phase-transitions\/","title":{"rendered":"#Antiferromagnet lattice arrangements influence phase transitions"},"content":{"rendered":"

“#Antiferromagnet lattice arrangements influence phase transitions<\/strong>”<\/p>\n

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Antiferromagnets contain orderly lattices of atoms and molecules, whose magnetic moments are always pointed in exactly opposite directions to those of their neighbors. These materials are driven to transition to other, more disorderly quantum states of matter, or ‘phases,’ by the quantum fluctuations of their atoms and molecules\u2014but so far, the precise nature of this process hasn’t been fully explored. Through new research published in EPJ B<\/i>, Yoshihiro Nishiyama at Okayama University in Japan has found that the nature of the boundary at which this transition occurs depends on the geometry of an antiferromagnet’s lattice arrangement.<\/p>\n


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Nishiyama’s discovery could enable physicists to app<\/a>ly antiferromagnets in a wider variety of contexts within material and quantum physics. His calculations concerned the ‘fidelity’ of the materials, which refers in this case to the degree of overlap between the ground states of their interacting lattice components. Furthermore, the fidelity ‘susceptibility’ describes the degree to which this overlap is influenced by an applied magnetic field. Since susceptibility is driven by quantum fluctuations, it can be expressed within the language of statistical mechanics\u2014describing how macroscopic observations can arise from the combined influences of many microscopic vibrations. This makes it a useful probe of how antiferromagnet phase transitions are driven by quantum fluctuations.<\/p>\n

Using advanced mathematical techniques, Nishiyama calculated how the susceptibility is affected by ‘imaginary’ magnetic fields\u2014which do not influence the physical world, but are crucial for describing the statistical mechanics of phase transitions. By applying this technique to an antiferromagnet arranged in a honeycomb lattice, he revealed that the transition between orderly, anti-aligned magnetic moments, and a state of disorder, occurs across a boundary with a different shape to that associated with the same transition in a square lattice. By clarifying how the geometric arrangement of lattice components has a subtle influence on this point of transition, Nishiyama’s work could advance physicists’ understanding of the statistical mechanics of antiferromagnets.<\/p>\n\n

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Future information technologies: 3-D quantum spin liquid revealed\n <\/p><\/div>\n

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\n More information:<\/strong>
\n Yoshihiro Nishiyama. Fidelity-susceptibility analysis of the honeycomb-lattice Ising antiferromagnet under the imaginary magnetic field, The European Physical Journal B<\/i> (2020). DOI: 10.1140\/epjb\/e2020-10264-5<\/a><\/p><\/div>\n

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Citation<\/strong>:
\n Antiferromagnet lattice arrangements influence phase transitions (2020, September 25)
\n retrieved 25 September 2020
\n from https:\/\/phys.org\/news<\/a>\/2020-09-antiferromagnet-lattice-phase-transitions.html<\/p>\n

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