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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}

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##### Citation

Jang, D., Portnichenko, P. Y., Cameron, A. S., Friemel, G., Dukhnenko, A. V., Shitsevalova, N. Y., et al. (2017).
Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce_{1-x}La_{x}B_{6}.* npj Quantum Materials,* *2*(1): 62, pp. 1-8. doi:10.1038/s41535-017-0068-x.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002E-2A5F-1

##### Abstract

For the last few decades, researchers have been intrigued by multipolar ordering phenomena and related quantum phase transitions in heavy-fermion Kondo systems. However, a criticality induced by substitution level (x), temperature (T), or magnetic field (B) is poorly understood even in the prototypical material, Ce1−x La x B6, despite a large collection of experimental results is available. In this work, we present T–B, x–T, and x–B phase diagrams of Ce1−x La x B6 (B || [110]). These are completed by investigating 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 including a high-entropy region is derived from the MCE analysis in which a knowledge beyond the equilibrium thermodynamics is involved. Finally, the x–B phase diagram at T = 0, which supports the existence of a quantum critical point 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.