TY  - JOUR
AU  - Jang, Dongjin
AU  - Portnichenko, Pavlo Y.
AU  - Cameron, Alistair S.
AU  - Friemel, Gerd
AU  - Dukhnenko, Anatoliy V.
AU  - Shitsevalova, Natalya Y.
AU  - Filipov, Volodymyr B.
AU  - Schneidewind, Astrid
AU  - Ivanov, Alexandre
AU  - Inosov, Dmytro S.
AU  - Brando, Manuel
TI  - Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce1 − x La x B6
JO  - npj quantum materials
VL  - 2
IS  - 1
SN  - 2397-4648
CY  - [London]
PB  - Nature Publishing Group
M1  - FZJ-2019-02439
SP  - 62
PY  - 2017
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000423481200001
DO  - DOI:10.1038/s41535-017-0068-x
UR  - https://juser.fz-juelich.de/record/862081
ER  -