Field-Induced Lifshitz Transition without Metamagnetism in ${\mathrm{CeIrIn}}_5$

We report high magnetic field measurements of magnetic torque, thermoelectric power, magnetization, and the de Haas–van Alphen effect in ${\mathrm{CeIrIn}}_5$ across 28 T, where a metamagnetic transition was suggested in previous studies. The thermoelectric power displays two maxima at 28 and 32 T. Above 28 T, a new, low de Haas–van Alphen frequency with a strongly enhanced effective mass emerges, while the highest frequency observed at low field disappears entirely. This suggests a field-induced Lifshitz transition. However, longitudinal magnetization does not show any anomaly up to 33 T, thus ruling out a metamagnetic transition at 28 T.

Figure 1

(a) Low temperature magnetic torque $\tau$, as a function of field $B$, applied at different angles from the $c$ axis. Lines are vertically shifted for clarity. (b) Derivative of torque signal vs magnetic field applied at 9° from the $c$ axis at different temperatures. Lines are shifted vertically for clarity. (c) TEP $S$ as a function of $B$ applied along the $c$ axis at different temperatures. The inset shows longitudinal magnetization $M$ vs $B$ at 0.35 K.

Figure 2

High field phase diagram of ${\text{CeIrIn}}_5$ obtained from TEP (solid symbols) and magnetic torque measurements (open symbols). Symbols correspond to anomalies indicated by arrows in Fig. 1, whereas lines are guides for the eyes only.

Figure 3

(a) dHvA oscillations above 28 T for the magnetic field applied at 1° from the $c$ axis at different temperatures. (b) Low frequency part of the Fourier spectra of oscillations from (a). (c) oscillatory amplitude as a function of temperature for the low frequency of 367 T, that emerges above 28 T. The line is a fit by the Lifshitz-Kosevich formula [25], yielding an effective mass of $54.1m_0$.

Figure 4

Fourier spectra of the dHvA oscillations below (a) and above (b) the LT in ${\text{CeIrIn}}_5$ with magnetic field at 10° from the [001] direction. For the oscillations above the transition (b), both the spectra obtained from FFT (black) and MEM (red) are shown. The new low dHvA frequency that emerges above the transition was filtered out for clarity.