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Title: Remarkably robust and correlated coherence and antiferromagnetism in (Ce 1-xLa x)Cu 2Ge 2

We present magnetic susceptibility, resistivity, specific heat, and thermoelectric power measurements on (Ce 1-xLa x)Cu 2Ge 2 single crystals (0 ≤ x ≤ 1). With La-substitution, the antiferromagnetic temperature T N 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 T coh up to ~0.9 of La, indicating a small percolation limit ~9% of Ce. T coh as a function of magnetic field was found to have different behavior for x < 0.9 and x > 0.9. Remarkably, (T coh) 2 at H = 0 was found to be linearly proportional to T N. In conclusion, the jump in the magnetic specific heat δC m at T N as a function of T K/T N for (Ce 1-xLa x)Cu 2Ge 2 follows the theoretical prediction based on the molecular field calculation for the S = 1/2 resonant level model.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-8644
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
AC02-07CH11358; FA9550-09-1-0603
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1227369
Alternate Identifier(s):
OSTI ID: 1184053

Hodovanets, H., Bud’ko, S. L., Straszheim, W. E., Taufour, V., Mun, E. D., Kim, H., Flint, R., and Canfield, P. C.. Remarkably robust and correlated coherence and antiferromagnetism in (Ce1-xLax)Cu2Ge2. United States: N. p., Web. doi:10.1103/PhysRevLett.114.236601.
Hodovanets, H., Bud’ko, S. L., Straszheim, W. E., Taufour, V., Mun, E. D., Kim, H., Flint, R., & Canfield, P. C.. Remarkably robust and correlated coherence and antiferromagnetism in (Ce1-xLax)Cu2Ge2. United States. doi:10.1103/PhysRevLett.114.236601.
Hodovanets, H., Bud’ko, S. L., Straszheim, W. E., Taufour, V., Mun, E. D., Kim, H., Flint, R., and Canfield, P. C.. 2015. "Remarkably robust and correlated coherence and antiferromagnetism in (Ce1-xLax)Cu2Ge2". United States. doi:10.1103/PhysRevLett.114.236601. https://www.osti.gov/servlets/purl/1227369.
@article{osti_1227369,
title = {Remarkably robust and correlated coherence and antiferromagnetism in (Ce1-xLax)Cu2Ge2},
author = {Hodovanets, H. and Bud’ko, S. L. and Straszheim, W. E. and Taufour, V. and Mun, E. D. and Kim, H. and Flint, R. and Canfield, P. C.},
abstractNote = {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. In conclusion, 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.},
doi = {10.1103/PhysRevLett.114.236601},
journal = {Physical Review Letters},
number = 23,
volume = 114,
place = {United States},
year = {2015},
month = {6}
}