Valence State in CeIrIn₅ at High Magnetic Fields of up to 42 T

Abstract

High-magnetic-field X-ray absorption spectroscopy of the heavy-fermion compound CeIrIn 5 has been conducted to clarify the valence state of Ce at the metamagnetic transition. The field-induced change in the X-ray absorption spectrum near the Ce-L 3 edge is found to be smaller than the resolution limit of the measurement, suggesting that no field-induced valence change larger than 0.005 takes place at 2 K up to 42 T.

The Metamagnetic Behavior of LaxCe1−xIrIn5 and CeIr(In1−xXx)5 (X = Cd, Sn)

“…The previous studies suggested that fluctuations of magnetic moment and valence of Ce atom are important for SC in CeIrIn 5 [14,15], however, it is controversial. X-ray absorption experiment in high-field revealed that Ce valence state does not change up to H ′ m ∼ 42 T [19]. In the vicinity of magnetic QCP, some Ce compounds such as CeRhIn 5 shows a field-induced magnetic transition above the critical pressure, where the magnetic transition temperature is suppressed to 0 K [20].…”