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Magnetic and transport properties of perovskites and related materials
Research Guide
What is Magnetic and transport properties of perovskites and related materials?
Magnetic and transport properties of perovskites and related materials refer to the electronic, magnetic, and conductive behaviors in perovskite-structured compounds, including phenomena such as colossal magnetoresistance, metal-insulator transitions, and ferromagnetism driven by d-shell interactions.
This field encompasses 79,380 works on perovskites and related materials, focusing on magnetocaloric effects, phase separation, and spin state transitions for energy-efficient cooling. Key studies address colossal magnetoresistance and room temperature applications through experimental and theoretical analyses of electronic structure. Transport properties exhibit sharp changes near metal-insulator transitions, often spanning orders of magnitude in resistivity.
Topic Hierarchy
Research Sub-Topics
Colossal Magnetoresistance in Perovskites
Studies explore giant negative magnetoresistance in manganite perovskites near metal-insulator transitions, linking to double-exchange mechanisms. Doping and strain effects on CMR magnitude are characterized experimentally and theoretically.
Metal-Insulator Transition in Perovskites
Researchers investigate temperature- and field-induced Mott-Hubbard transitions in perovskite oxides, using transport and spectroscopy. Role of electron correlations and bandwidth control is emphasized.
Spin State Transitions in Perovskites
This sub-topic covers pressure- and temperature-driven high-spin to low-spin changes in cobaltites and iron-based perovskites, affecting magnetism and conductivity. Theoretical models predict transition thermodynamics.
Phase Separation in Magnetocaloric Perovskites
Investigations focus on nanoscale electronic and magnetic phase coexistence in manganites, probed by imaging and neutron scattering. Implications for giant magnetocaloric effects are assessed.
Room Temperature Ferromagnetism in Perovskite Oxides
Studies develop doped perovskites exhibiting ferromagnetic order above room temperature for spintronics, analyzing carrier-mediated exchange. Thin-film growth optimizes Tc and conductivity.
Why It Matters
Perovskite materials with tailored magnetic and transport properties enable energy-efficient cooling via the magnetocaloric effect, targeting room temperature applications. Clarence Zener (1951) interpreted the correlation between electrical conduction and ferromagnetism in manganese perovskite compounds, linking d-shell interactions to double-exchange mechanisms that enhance conductivity under magnetic fields. Masatoshi Imada et al. (1998) documented metal-insulator transitions with resistivity changes over tens of orders of magnitude, applicable in sensors and switches. These properties support developments in colossal magnetoresistance devices, as seen in ferromagnetic semiconductors and orbital physics studies.
Reading Guide
Where to Start
'Interaction between the d-Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite Structure' by Clarence Zener (1951), as it provides the foundational explanation of ferromagnetism and conduction correlation in manganese perovskites, directly addressing core transport and magnetic properties.
Key Papers Explained
Clarence Zener (1951) in 'Interaction between the d-Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite Structure' establishes d-shell double-exchange for perovskite ferromagnetism, which Masatoshi Imada et al. (1998) extend in 'Metal-insulator transitions' to explain resistivity jumps. V. I. Anisimov et al. (1991) build on this with Hubbard U corrections in 'Band theory and Mott insulators: Hubbard U instead of Stoner I' for accurate electronic structure, while John P. Perdew and Alex Zunger (1981) provide essential self-interaction corrections in 'Self-interaction correction to density-functional approximations for many-electron systems' underpinning these calculations.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current efforts focus on refining dynamical mean-field theory for infinite dimensions, as in Antoine Georges et al. (1996) 'Dynamical mean-field theory of strongly correlated fermion systems and the limit of infinite dimensions,' to model real perovskite transport. No recent preprints available, but extensions target room temperature magnetocaloric optimization via phase separation control.
Papers at a Glance
Frequently Asked Questions
What role do d-shell interactions play in perovskite ferromagnetism?
In manganese perovskites, d-shell interactions between transition metals drive ferromagnetism and electrical conduction via double-exchange. Clarence Zener (1951) explained this correlation in 'Interaction between the d-Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite Structure,' where aligned spins facilitate electron hopping. This mechanism links magnetic order to metallic transport properties.
How do metal-insulator transitions manifest in perovskites?
Metal-insulator transitions in perovskites involve huge resistivity changes, often tens of orders of magnitude, tied to electronic correlations. Masatoshi Imada et al. (1998) reviewed these in 'Metal-insulator transitions,' highlighting observations in correlated systems like manganites. The transitions accompany magnetic ordering and phase separation.
What is the significance of density functional theory in studying perovskite electronic structure?
Density functional approximations require corrections for self-interaction errors in strongly correlated perovskites. John P. Perdew and Alex Zunger (1981) introduced self-interaction corrections in 'Self-interaction correction to density-functional approximations for many-electron systems' to improve accuracy for Mott insulators. These methods enable reliable band structure calculations.
Why are Hubbard U corrections used in perovskite band theory?
Hubbard U corrects local-density approximations for Mott insulators by accounting for strong on-site Coulomb repulsion. V. I. Anisimov et al. (1991) proposed this in 'Band theory and Mott insulators: Hubbard U instead of Stoner I,' replacing Stoner I for magnetic and orbital ordering in perovskites. It relates single-particle potentials to observed order parameters.
What applications arise from colossal magnetoresistance in perovskites?
Colossal magnetoresistance in perovskites enables large resistivity changes under magnetic fields, suitable for sensors and memory devices. Studies link this to phase separation and spin state transitions near room temperature. The effect stems from double-exchange and electronic structure modifications in manganites.
Open Research Questions
- ? How can phase separation be precisely controlled in perovskite manganites to optimize colossal magnetoresistance at room temperature?
- ? What theoretical frameworks best predict spin state transitions in perovskites under varying pressure and doping?
- ? To what extent do orbital physics and electronic correlations influence metal-insulator transitions in ferromagnetic semiconductors?
- ? How do magnetocaloric properties scale in perovskite structures for practical energy-efficient cooling devices?
- ? What refinements to dynamical mean-field theory improve modeling of transport in strongly correlated perovskites?
Recent Trends
The field maintains 79,380 works with sustained interest in perovskites for colossal magnetoresistance and metal-insulator transitions, as foundational papers like Zener continue high citation rates.
1951No growth rate data over 5 years or recent preprints reported.
Emphasis persists on theoretical corrections, such as Perdew and Zunger self-interaction methods, applied to electronic structure amid ongoing magnetocaloric material studies.
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