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Remarkably robust and correlated coherence and antiferromagnetism in (Ce<sub>1-x</sub>La<sub>x</sub>)Cu<sub>2</sub>Ge<sub>2</sub> [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 236,601 : digital, PDF file
Additional Creators
Ames Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
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.
Report Numbers
E 1.99:is-j--8644
is-j--8644
Subject(s)
Note
Published through SciTech Connect.
06/08/2015.
"is-j--8644"
Physical Review Letters 114 23 ISSN 0031-9007; PRLTAO AM
Hodovanets, H.; Bud’ko, S.; Straszheim, W.; Taufour, V.; Mun, E.; Kim, H.; Flint, R.; Canfield, P.
Funding Information
AC02-07CH11358
FA9550-09-1-0603
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