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Temperature–field phase diagram of quantum critical CeAuSb 2
Author(s) -
Lorenzer K.A.,
Strydom A. M.,
Thamizhavel A.,
Paschen S.
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.201200783
Subject(s) - condensed matter physics , quantum critical point , metamagnetism , antiferromagnetism , phase diagram , critical field , quantum phase transition , magnetization , electrical resistivity and conductivity , magnetic field , phase transition , physics , isothermal process , phase (matter) , superconductivity , quantum mechanics , thermodynamics
CeAuSb 2 has previously been classified as an antiferromagnet with moderately enhanced electron masses. As the magnetic order is suppressed by a magnetic field, non‐Fermi liquid behaviour has been shown to emerge, suggesting the presence of a quantum critical point (QCP). Within the ordered phase a metamagnetic transition was detected. Here we investigate the material by isothermal magnetization M ( H ), transverse magnetoresistivity ρ t ( H ) and Hall resistivity ρ H ( H ) measurements. We show that the metamagnetic transition splits into two first order transitions below 2 K. Pronounced anomalies in ρ t ( H ) and ρ H ( H ) are not only observed at the QCP and the metamagnetic transitions but also at a new characteristic field above the QCP.