Campus Units
Physics and Astronomy, Ames Laboratory
Document Type
Article
Publication Version
Published Version
Publication Date
6-12-2015
Journal or Book Title
Physical Review Letters
Volume
114
Issue
23
First Page
236601
DOI
10.1103/PhysRevLett.114.236601
Abstract
We present magnetic susceptibility, resistivity, specific heat, and thermoelectric power measurements on (Ce1−xLax)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 (Ce1−xLax)Cu2Ge2 follows the theoretical prediction based on the molecular field calculation for the S=1/2 resonant level model.
Copyright Owner
American Physical Society
Copyright Date
2015
Language
en
File Format
application/pdf
Recommended Citation
Hodovanets, H.; Bud’ko, Sergey L.; Straszheim, W. E.; Taufour, V.; Mun, E. D.; Kim, H.; Flint, R.; and Canfield, Paul C., "Remarkably Robust and Correlated Coherence and Antiferromagnetism in (Ce1-xLax)Cu2Ge2" (2015). Physics and Astronomy Publications. 597.
https://lib.dr.iastate.edu/physastro_pubs/597
Comments
This article is published as Hodovanets, H., S. L. Bud’ko, W. E. Straszheim, V. Taufour, E. D. Mun, H. Kim, R. Flint, and P. C. Canfield. "Remarkably Robust and Correlated Coherence and Antiferromagnetism in (Ce 1− x La x) Cu 2 Ge 2." Physical Review Letters 114, no. 23 (2015): 236601. DOI: 10.1103/PhysRevLett.114.236601. Posted with permission.