Quantum criticality in itinerant metamagnets

Abstract

Critical thermodynamics close to a metamagnetic quantum critical endpoint (QCEP) in a metal is discussed within the framework of spin-fluctuation theory. We analyze the effective potential for the Ising order parameter that is renormalized by spin-fluctuations and acquires a characteristic temperature dependence. The resulting magnetic field, H, and temperature, T, dependence of the magnetization, specific heat, thermal expansion, magnetostriction, susceptibility and the Grüneisen parameter are determined, and the crossover lines in the (H,T) phase diagram are specified. We point out that the metamagnetic QCEP is intrinsically unstable with respect to a magnetoelastic coupling.

11 pages, 9 figures

References in corpus (9)

• Quantum critical behavior in itinerant electron systems -- Eliashberg theory and instability of a ferromagnetic quantum-critical point
• Tricritical point and wing structure in the itinerant ferromagnet UGe2
• Metamagnetism of itinerant electrons in multi-layer ruthenates
• Metamagnetic quantum criticality in Sr3Ru2O7 studied by thermal expansion
• Nonanalytic paramagnetic response of itinerant fermions away and near a ferromagnetic quantum phase transition
• Metamagnetism and Lifshitz Transitions in Models for Heavy Fermions
• Symmetry-breaking lattice distortion in Sr_3Ru_2O_7
• Spin-spin correlations of the spin-ladder compound (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$ measured by magnetostriction and comparison to Quantum Monte Carlo results
• Pressure Evolution of the Magnetic Field induced Ferromagnetic Fluctuation through the Pseudo-Metamagnetism of CeRu2Si2

Cited by in corpus (8)

• Quantum bicriticality in the heavy-fermion metamagnet YbAgGe
• Grüneisen parameter studies on heavy fermion quantum criticality
• Multiple metamagnetic quantum criticality in Sr${}_3$Ru${}_2$O${}_7$
• Ferromagnetic Quantum Criticality Studied by Hall Effect Measurements in UCoAl
• Low temperature thermodynamic investigation of the phase diagram of Sr${}_3$Ru${}_2$O${}_7$
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Collapse of the magnetic moment under pressure of AFe${}_2$ (A = Y, Zr, Lu and Hf) in the cubic Laves phase
• Self-reconstruction of order parameter in spin-triplet superconductor UTe${}_2$