Angle-resolved photoemission spectroscopy study of crystal electric field in heavy fermion compound CePt2In7

TL;DR

This study uses angle-resolved photoemission spectroscopy to explore the electronic structure and crystal electric field effects in the heavy fermion superconductor CePt2In7, revealing temperature-dependent quasiparticle formation and Fermi surface topology.

Contribution

It provides new insights into the three-dimensional electronic structure and the role of crystal electric field splitting in heavy quasiparticle formation in CePt2In7.

Findings

Quasi-two and three dimensional Fermi surface topologies identified.

Heavy quasiparticle bands form above the coherence temperature T*.

Crystal electric field splitting influences the emergence of heavy bands.

Abstract

The three-dimensional electronic structure and Ce 4f electrons of the heavy fermion superconductor CePt2In7 is investigated. Angle-resolved photoemission spectroscopy using variable photon energy establishes the existence of quasi-two and three dimensional Fermi surface topologies. Temperature-dependent 4d-4f on-resonance photoemission spectroscopies reveal that heavy quasiparticle bands begin to form at a temperature well above the characteristic (coherence) temperature T*. T* emergence may be closely related to crystal electric field splitting, particularly the low-lying heavy band formed by crystal electric field splitting.