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Evolution from a magnetically correlated state to a single impurity state in heavy fermion system Ce 3− x La x Co 4 Sn 13
Author(s) -
Ślebarski A.,
Fijałkowski M.,
Goraus J.
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201200571
Subject(s) - heavy fermion , impurity , quantum critical point , condensed matter physics , physics , fermion , specific heat , anderson impurity model , magnetic impurity , state (computer science) , superconductivity , quantum phase transition , phase transition , quantum mechanics , algorithm , computer science
Ce 3 Co 4 Sn 13 crystallizes in the cubic Yb 3 Rh 4 Sn 13 structure, which is closely related to the one of scutterudites, well known thermoelectric materials. Ce 3 Co 4 Sn 13 exhibits novel physical properties, a large increase in C mag / T was recently observed at low temperatures with a maximum value of about 4 J K −2 ${\rm mol}_{{\rm Ce}}^{- 1} $ . The specific heat data suggested that Ce 3 Co 4 Sn 13 is likely near a magnetic quantum critical point (QCP). In this report we investigate the low‐temperature specific heat of Ce 3− x La x Co 4 Sn 13 in order to study the proximity of Ce 3 Co 4 Sn 13 to the possible magnetic QCP. We found the critical concentration x c ≈ 0.6 which separates the magnetically correlated state with a maximum in C ( T )/ T at ∼0.7 K for x < x c , and a single impurity state for x > x c in heavy fermion (HF) system Ce 3− x La x Co 4 Sn 13 . However, for x c the low‐temperature C ( T )/ T behaviour is not characteristic of the QCP.