title: Remarkably Robust and Correlated Coherence and Antiferromagnetism in (Ce(1-x)La(x))Cu2Ge2.
abstract: We present magnetic susceptibility, resistivity, specific heat, and thermoelectric power measurements on (Ce(1-x)La(x))Cu2Ge2 single crystals (0≤x≤1). With La substitution, the antiferromagnetic temperature TN is suppressed in an almost linear fashion and moves below 0.36 K, the base temperature of our measurements for x>0.8. Surprisingly, in addition to robust antiferromagnetism, the system also shows low temperature coherent scattering below Tcoh up to ∼0.9 of La, indicating a small percolation limit ∼9% of Ce. Tcoh as a function of magnetic field was found to have different behavior for x<0.9 and x>0.9. Remarkably, (Tcoh)(2) at H=0 was found to be linearly proportional to TN. The jump in the magnetic specific heat δCm at TN as a function of TK/TN for (Ce(1-x)La(x))Cu2Ge2 follows the theoretical prediction based on the molecular field calculation for the S=1/2 resonant level model.
authors.affiliation: Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: H
authors.initials: H
authors.lastname: Hodovanets
authors.affiliation: Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: S L
authors.initials: SL
authors.lastname: Bud'ko
authors.affiliation: Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: W E
authors.initials: WE
authors.lastname: Straszheim
authors.affiliation: Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: V
authors.initials: V
authors.lastname: Taufour
authors.affiliation: Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: E D
authors.initials: ED
authors.lastname: Mun
authors.affiliation: Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: H
authors.initials: H
authors.lastname: Kim
authors.affiliation: Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: R
authors.initials: R
authors.lastname: Flint
authors.affiliation: Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: P C
authors.initials: PC
authors.lastname: Canfield