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Condensed Matter & Materials Physics

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Condensed Matter & Materials Physics

Shape Memory Alloys

A class of smart metallic alloys that can be deformed when cold, but return to their original pre-deformed shape when heated above a…

Reversible Austenite (High T) ↔ Martensite (Low T) Phase Shift % (Recoverable Superelastic Strain)
Condensed Matter & Materials Physics

Spin Glass

A disordered magnetic state characterized by random, competing ferromagnetic and antiferromagnetic interactions that freeze atomic spins…

Frustrated Exchange Interaction J_ij Disordered Magnetic Phase
Condensed Matter & Materials Physics

Superalloys

High-performance metallic alloys engineered to maintain exceptional mechanical strength, creep resistance, and oxidation resistance at high…

γ' Phase Precipitation: Ni₃(Al, Ti) High Temperature Strength (MPa at >800 °C)
Condensed Matter & Materials Physics

Superconductivity

A macroscopic quantum state of matter where certain materials exhibit exactly zero electrical DC resistance and complete expulsion of…

R = 0 (for T < T_c), B = 0 (Meissner expulsion) K (Critical Temperature T_c)
Condensed Matter & Materials Physics

Superfluidity

A macroscopic quantum state of matter where a fluid flows with exactly zero viscosity and zero kinetic entropy.

Viscosity η = 0 (Below Lambda point T_λ = 2.17 K) K (Lambda Transition Temperature)
Condensed Matter & Materials Physics

Surface Energy

The excess thermodynamic energy at the surface of a material relative to its interior bulk, caused by disrupted, incomplete atomic bonds.

γ = dW / dA J/m² or N/m
Condensed Matter & Materials Physics

Topological Insulator

A quantum material that behaves as an electrical insulator in its 3D interior bulk but features robust conducting metallic states on its 2D…

Z₂ Topological Invariant ν = 1 Quantum Phase Class
Condensed Matter & Materials Physics

Type I & II Superconductors

The classification of superconductors based on their magnetic field response and flux penetration characteristics.

Type I: Single H_c; Type II: Lower H_c1 and Upper H_c2 T or A/m (Critical Magnetic Field)
Condensed Matter & Materials Physics

Unit Cell

The smallest repeating structural unit of a crystal lattice that generates the entire 3D crystal structure through simple translational…

V_cell = a · (b × c) ų or nm³ (Unit Cell Volume)
Condensed Matter & Materials Physics

Valence Band

The highest range of electron energy bands in a solid that is fully occupied by bound valence electrons at absolute zero temperature.

Occupied by valence electrons at T = 0 K eV (Energy Levels)
Condensed Matter & Materials Physics

Work Hardening

The strengthening of a metal by plastic deformation, caused by dislocation multiplication and entanglement obstructing further slip.

σ_y = σ₀ + α G b √ρ_dislocation (Taylor Relation) MPa (Increased Yield Strength)
Condensed Matter & Materials Physics

Young's Modulus

A mechanical property measuring the tensile or compressive stiffness of a solid material in its linear elastic deformation regime.

E = σ / ε = (F / A) / (ΔL / L₀) Pa or GPa (Gigapascals)