%0 Journal Article
%A Jang, Dongjin
%A Portnichenko, Pavlo Y.
%A Cameron, Alistair S.
%A Friemel, Gerd
%A Dukhnenko, Anatoliy V.
%A Shitsevalova, Natalya Y.
%A Filipov, Volodymyr B.
%A Schneidewind, Astrid
%A Ivanov, Alexandre
%A Inosov, Dmytro S.
%A Brando, Manuel
%T Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce1 − x La x B6
%J npj quantum materials
%V 2
%N 1
%@ 2397-4648
%C [London]
%I Nature Publishing Group
%M FZJ-2019-02439
%P 62
%D 2017
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000423481200001
%R 10.1038/s41535-017-0068-x
%U https://juser.fz-juelich.de/record/862081