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

Jang, Dongjin; Dukhnenko, Anatoliy V.; Cameron, Alistair S.; Ivanov, Alexandre; Friemel, Gerd; Schneidewind, Astrid; Brando, Manuel; Filipov, Volodymyr B.; Portnichenko, Pavlo Y.; Shitsevalova, Natalya Y.; Inosov, Dmytro S.

doi:10.1038/s41535-017-0068-x

Journal Article

FZJ-2019-02439

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

Jang, D. (Corresponding author) ; Portnichenko, P. Y. ; Cameron, A. S. ; Friemel, G. ; Dukhnenko, A. V. ; Shitsevalova, N. Y. ; Filipov, V. B. ; Schneidewind, A.FZJ* ; Ivanov, A. ; Inosov, D. S. ; Brando, M.

2017
Nature Publishing Group [London]

npj quantum materials 2(1), 62 (2017) [10.1038/s41535-017-0068-x]

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Please use a persistent id in citations: http://hdl.handle.net/2128/22050 doi:10.1038/s41535-017-0068-x

Abstract: For the last few decades, researchers have been intrigued by multipolar ordering phenomena and related quantum phasetransitions in heavy-fermion Kondo systems. However, a criticality induced by substitution level (x), temperature (T), or magneticfield (B) is poorly understood even in the prototypical material, Ce1−xLaxB6, despite a large collection of experimental results isavailable. In this work, we presentT–B,x–T, andx–Bphase diagrams of Ce1−xLaxB6(B|| [110]). These are completed by investigatingheat capacity, magnetocaloric effect (MCE), and elastic neutron scattering. A drastic increase of the Sommerfeld coefficientγ0,which is estimated from the heat capacity down to 0.05 K, is observed with increasingx. The preciseT–Bphase diagram including ahigh-entropy region is derived from the MCE analysis in which a knowledge beyond the equilibrium thermodynamics is involved.Finally, thex–Bphase diagram atT= 0, which supports the existence of a quantum critical point atx> 0.75, is obtained by the sameanalysis. A detailed interpretation of phase diagrams strongly indicates positive correlation between thefluctuating multipoles andthe effective electron mass.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd)

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