The Magnetic Phase Diagram and the Pressure and Field Dependence of the Fermi Surface in UGe${}_2$

Abstract

The ac susceptibility and de Haas-van Alphen (dHvA) effect in UGe${}_2$ are measured at pressures {\it P} up to 17.7 kbar for the magnetic field {\it B} parallel to the {\it a} axis, which is the easy axis of magnetization. Two anomalies are observed at {\it B${}_x$}({\it P}) and {\it B}${}_m$({\it P}) ({\it B${}_x$} $>$ {\it B}${}_m$ at any {\it P}), and the {\it P}-{\it B} phase diagram is presented. The Fermi surface and quasiparticle mass are found to vary smoothly with pressure up to 17.7 kbar unless the phase boundary {\it B${}_x$}({\it P}) is crossed. The observed dHvA frequencies may be grouped into three according to their pressure dependences, which are largely positive, nearly constant or negative. It is suggested that the quasiparticle mass moderately increases as the boundary {\it B${}_x$}({\it P}) is approached. DHvA effect measurements are also performed across the boundary at 16.8 kbar.

to be published in Phys. Rev. B

References in corpus (2)

• Quantum critical effects on transition temperature of magnetically mediated p-wave superconductivity
• Magnetic Properties of a Pressure-induced Superconductor UGe${}_2$

Cited by in corpus (16)

• Superconducting phases of f-electron compounds
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Pressure dependence of the magnetization in the ferromagnetic superconductor UGe_2
• Ferromagnetism and Superconductivity in Uranium Compounds
• Field-reentrant superconductivity close to a metamagnetic transition in the heavy-fermion superconductor UTe${}_2$
• Extremely Large and Anisotropic Upper Critical Field and the Ferromagnetic Instability in UCoGe
• Ferromagnetic superconductivity driven by changing Fermi surface topology
• Ferromagnetic Quantum Critical Endpoint in UCoAl
• Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe
• Heat-capacity anomalies at $T_{sc}$ and $T^{\ast }$ in the ferromagnetic superconductor UGe${}_2$
• Superconductivity Reinforced by Magnetic Field and the Magnetic Instability in Uranium Ferromagnets
• Ferromagnetism and Fermi-surface transition in the periodic Anderson model: Second-order phase transition without symmetry breaking
• Thermoelectric power quantum oscillations in the ferromagnet UGe${}_2$
• Lifshitz Transitions in Magnetic Phases of the Periodic Anderson Model
• On the phase diagram of UGe2
• Equilibrium magnetisation structures in ferromagnetic nanorings