Interplay between different states in heavy fermion physics

TL;DR

This paper investigates the complex interactions between superconductivity, antiferromagnetism, and spin density waves in heavy fermion compounds CeRhIn5 and URu2Si2 using high-pressure calorimetry, revealing coexistence and re-entrance phenomena.

Contribution

It provides new experimental evidence on the interplay and coexistence of different magnetic and superconducting states under high pressure in heavy fermion materials.

Findings

Re-entrance of antiferromagnetism in CeRhIn5 under magnetic field

Coexistence of spin density wave and large moment antiferromagnetism in URu2Si2 at high pressures

Superconductivity and antiferromagnetism interplay up to 2.5 GPa in CeRhIn5

Abstract

Calorimetry experiments under high pressure were used to clarify the interplay between different states such as superconductivity and antiferromagnetism in CeRhIn5, spin density wave and large moment antiferromagnetism in URu2Si2. Evidences are given on the re-entrance of antiferromagnetism under magnetic field in the superconducting phase of CeRhIn5 up to pc = 2.5 GPa where the Neel temperature will collapse in the absence of superconductivity. For URu2Si2 measurements up to 10 GPa support strongly the coexistence of spin density wave and large moment antiferromagnetism at high pressures.