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Title: Unveiling Quadrupolar Kondo Effect in the Heavy Fermion Superconductor PrV2Al20

Journal Article · · Journal of the Physical Society of Japan
 [1];  [2];  [2];  [2];  [3];  [4]
  1. Univ. of Tokyo, Chiba (Japan); Johns Hopkins University
  2. Univ. of Tokyo, Chiba (Japan)
  3. Max Planck Inst. for Solid State Research, Stuttgart (Germany)
  4. Univ. of Tokyo, Chiba (Japan); Univ. of Tokyo (Japan); Japan Science and Technology Agency (JST), Saitama (Japan); Johns Hopkins Univ., Baltimore, MD (United States)

Heavy fermion metals hosting multipolar local moments set a new stage for exploring exotic spin–orbital entangled quantum phases. In such systems, the quadrupolar Kondo effect serves as the key ingredient in the orbital-driven non-Fermi liquid (NFL) behavior and quantum critical phenomena. The cubic heavy fermion superconductor PrTr2Al20 (Tr: Ti, V) is a prime candidate for realizing the quadrupolar Kondo lattice. Here, we present a systematic study of the NFL phenomena in PrV2Al20 based on magnetoresistance (MR), magnetic susceptibility and specific heat measurements. Upon entering the NFL regime, we observe a universal scaling behavior expected for the quadrupolar Kondo lattice in PrV2Al20, which indicates a prominent role of the quadrupolar Kondo effect in driving the NFL behavior. Deviations from this scaling relation occur below ~8 K, accompanied by a sign change in the MR and a power-law divergence in the specific heat. Furthermore, this anomalous low-temperature state points to the presence of other mechanisms which are not included in the theory, such as heavy fermion coherence or multipolar quantum critical fluctuations.

Research Organization:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-08ER46544; SC0019331
OSTI ID:
1825711
Journal Information:
Journal of the Physical Society of Japan, Journal Name: Journal of the Physical Society of Japan Journal Issue: 1 Vol. 89; ISSN 0031-9015
Publisher:
Physical Society of JapanCopyright Statement
Country of Publication:
United States
Language:
English

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