Low temperature heat capacity, magnetization, resistivity of CeRu2Si2, with Y or La substitution

Fermi Surface Properties, Metamagnetic Transition and Quantum Phase Transition of CeRu2Si2 and Its Alloys Probed by the dHvA Effect

“…9 The ground state of the crystalline electric field is the Γ 7 Kramers doublet α|5/2, ±5/2 + β|5/2, ∓3/2 with α 2 + β 2 = 1 and α being close to 1.0. It is separated from the excited state by 220 -363 K. [10][11][12] If we do not consider the magnetism of a tiny moment 13 or the properties under very small magnetic fields, 14 the ground state can be assumed to be paramagnetic.…”

“…10 Electronic specific heat coefficient γ is measured to be 320-360 mJ/mol·K 2 . 10,18 The resistivity shows the Fermi liquid behavior and the coefficient A of the T 2 term in the temperature dependence of resistivity nearly satisfies the Kadowaki-Woods relation with the proportionality constant of 1 × 10 −5 µΩcm(Kmol/mJ) 2 . 19,20 It has a large magnetic anisotropy.…”

Electronic structure ofCeRu2X2(X=Si,Yano1, Sekiyama2, Fujiwara3 et al. 2008Phys. Rev. B515210View full textAdd to dashboardCite

“…8 On the other hand, in the case of CeRu 2 Si 2 , the Ce 4f electron couples with the valence electron and makes the so called Kondo singlet state below the Kondo temperature T K ∼ 20 K. 9,10 CeRu 2 Si 2 is known as a typical heavy fermion system which has a large value of the electronic specific heat coefficient γ ∼ 350 mJ/mol K 2 (about 20 times larger than that of CeRu 2 Ge 2 ). 11,12,13 Such a difference in 4f electronic states is thought to originate from the different hybridization strength between the 4f and valence electrons. For example, when high pressure is applied to CeRu 2 Ge 2 , the hybridization strength increases and the electronic structures of CeRu 2 Ge 2 approach to those of CeRu 2 Si 2 .…”

ac susceptibility and static magnetization measurements ofCeRu2Si2at small magnetic fields and ultralow temperatures

“…8͒ are regarded as type-͑ii͒ QCP. 6 CeRu 2 Si 2 with a ThCr 2 Si 2 -type crystal structure is well known to be a typical HF compound with an electronic specific-heat coefficient ␥ϭ350 mJ/K 2 mol below T K ϭ20 K. 9,10 This compound exhibits the pseudometamagnetic transition into the ferromagnetically ordered state induced by the magnetic field at H M ϭ7.8 T below 10 K. [11][12][13][14][15] The neutron-scattering measurements note short-range antiferromagnetic ͑AFM͒ correlations in CeRu 2 Si 2 even below T K . These time-fluctuating correlations are described by different incommensurate wave vectors.…”