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Intriguing magnetic and electronic behaviors in La and Ru doped SrIrO.
J Phys Condens Matter
January 2025
Department of Physics (MMV), Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India.
We report a detailed experimental study of the structural, magnetic and electrical properties of La and Ru doped (SrLa)IrRuO(= 0.05, 0.15).
View Article and Find Full Text PDFEvidence that the de Almeida-Thouless transition disappears below six dimensions.
Phys Rev E
November 2024
Department of Physics, Indian Institute of Science Education and Research, Bhopal, Madhya Pradesh 462066, India.
One of the key predictions of Parisi's broken replica symmetry theory of spin glasses is the existence of a phase transition in an applied field to a state with broken replica symmetry. This transition takes place at the de Almeida-Thouless (AT) line in the h-T plane. We have studied this line in the power-law diluted Heisenberg spin glass in which the probability that two spins separated by a distance r interact with each other falls as 1/r^{2σ}.
View Article and Find Full Text PDFLearning in Associative Networks Through Pavlovian Dynamics.
Neural Comput
January 2025
GNFM-INdAM, Gruppo Nazionale di Fisica Matematica, Istituto Nazionale di Alta Matematica, 00185 Rome, Italy.
Article Synopsis
- Hebbian learning theory, inspired by Pavlov's classical conditioning, has been examined using mathematical models, showing that synaptic dynamics can mimic Pavlov's mechanisms and align with Hebbian principles.
- By employing equilibrium statistical mechanics and simplistic modeling, the authors derive a system of coupled differential equations that highlight the convergence of synaptic evolution to the Hebbian learning rule.
- The study further connects the model to sleep-associated memory consolidation, suggesting that Pavlovian learning mechanisms can coexist with neural activities during dreaming.
Direct magnetic writing of ferromagnetic nanoscale elements provides an alternative pathway for potential application in data storage or spintronic devices. Magnetic patterning due to local chemical disordering of FeAl thin films results in adjacent nanoscale regions that possess two different phases, a low-magnetization and high-coercive chemically ordered phase (non-irradiated ferromagnetic area, NIFM) and a high-magnetization and low-coercive chemically disordered phase (irradiated ferromagnetic area, IMF). Depending on the volume of NIFM and IFM phases, different interaction mechanisms were revealed.
View Article and Find Full Text PDFCovalent Stabilization of the Iridium-Containing Oxyhydrides SrMnIrOH and SrMnIrOH.
Inorg Chem
November 2024
Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, United Kingdom.
Reaction between SrMnIrO and CaH or LiH yields the iridium-containing oxyhydride phases SrMnIrOH or SrMnIrOH, respectively. Analysis of Mn K-edge XANES data indicate the presence of Ir centers in these oxyhydride phases, whose low-spin d configuration is consistent with the "covalent stabilization" of the metastable oxyhydride phases, as seen previously in analogous ruthenium and rhodium containing materials. Neutron powder diffraction data indicate the hydride ions are located exclusively within the "equatorial" anion sites of SrMnIrOH.
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