Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce$_{1-x}$La$_x$B$_6$

D. J. Jang; P. Y. Portnichenko; A. S. Cameron; G. Friemel; A. V. Dukhnenko; N. Y. Shitsevalova; V. B. Filipov; A. Schneidewind; A. Ivanov; D. S. Inosov; M. Brando

doi:10.1038/s41535-017-0068-x

paper

Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce $_{1 - x}$ La $_{x}$ B $_{6}$

arXiv:1705.10871 · doi:10.1038/s41535-017-0068-x

Abstract

For the last few decades, researchers have been intrigued by multipolar ordering phenomena while looking for the related quantum criticality in the heavy-fermion Kondo system Ce $_{1 - x}$ La $_{x}$ B $_{6}$ . However, critical phenomena induced by substitution level ( $x$ ), temperature ( $T$ ), and magnetic field ( $B$ ) are poorly understood despite a large collection of experimental results is available. In this work, we present $T$ - $B$ , $x$ - $T$ , and $x$ - $B$ phase diagrams of Ce $_{1 - x}$ La $_{x}$ B $_{6}$ ( $B ∥ [110]$ ). These are completed by analyzing heat capacity, magnetocaloric effect (MCE), and elastic neutron scattering. A drastic increase of the Sommerfeld coefficient $γ_{0}$ , which is estimated from the heat capacity down to 0.05 K, is observed with increasing $x$ . The precise $T$ - $B$ phase diagram which includes an unforeseen high-entropy region is drawn by analyzing the MCE for the first time in Ce $_{1 - x}$ La $_{x}$ B $_{6}$ . The $x$ - $B$ phase diagram, which supports the existence of a QCP at $x > 0.75$ , is obtained by the same analysis. A detailed interpretation of phase diagrams strongly indicates positive correlation between the fluctuating multipoles and the effective electron mass.

11 pages, 8 figures

Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce1−x​Lax​B6​

Abstract

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Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce $_{1 - x}$ La $_{x}$ B $_{6}$