title: Pressure and magnetic field tuned quantum critical point in the Kondo antiferromagnet CePtZn.
abstract: We report magnetization, heat capacity and electrical resistivity measurements on CePtZn, which crystallizes in the orthorhombic TiNiSi type structure. Magnetization and electrical resistivity on the iso-structural series of compounds Ce(1-x)La(x)PtZn (x = 0.1, 0.2 0.5 and 1) were also carried out. The electrical resistivity of CePtZn was also measured in external magnetic fields up to 12 T and under pressures up to 2.66 GPa. We find that CePtZn is a dense Kondo lattice, ordering antiferromagnetically at T(N) = 1.7 K, with a comparable Kondo temperature. The magnetic transition temperature, T(N), is continuously suppressed both by the magnetic field and pressure and [Formula: see text] around 5-6 T and at 1.2 GPa, respectively. Non-Fermi liquid behavior of resistivity at 4 T and 1.2 GPa and logarithmic divergence of the heat capacity, C(4f)/T, at 6 T in a limited temperature region strongly suggest the emergence of a quantum critical point as [Formula: see text].
authors.affiliation: CMP&MS, TIFR, Homi Bhabha Road, Colaba, Mumbai 400 005, India.
authors.forename: S K
authors.initials: SK
authors.lastname: Dhar
authors.forename: R
authors.initials: R
authors.lastname: Kulkarni
authors.forename: H
authors.initials: H
authors.lastname: Hidaka
authors.forename: Y
authors.initials: Y
authors.lastname: Toda
authors.forename: H
authors.initials: H
authors.lastname: Kotegawa
authors.forename: T C
authors.initials: TC
authors.lastname: Kobayashi
authors.forename: P
authors.initials: P
authors.lastname: Manfrinetti
authors.forename: A
authors.initials: A
authors.lastname: Provino