Remarkably robust and correlated coherence and antiferromagnetism in (Ce1-xLax)Cu2Ge2

Hodovanets, H.; Bud’ko, S. L.; Straszheim, W. E.; Taufour, V.; Mun, E. D.; Kim, H.; Flint, R.; Canfield, P. C.

doi:10.1103/PhysRevLett.114.236601

Title: Remarkably robust and correlated coherence and antiferromagnetism in (Ce_1-xLa_x)Cu₂Ge₂

Journal Article · Mon Jun 08 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.236601· OSTI ID:1227369

Hodovanets, H. ^[1]; Bud’ko, S. L. ^[1]; Straszheim, W. E. ^[1]; Taufour, V. ^[1]; Mun, E. D. ^[1]; Kim, H. ^[1]; Flint, R. ^[1]; Canfield, P. C. ^[1]

Iowa State Univ., Ames, IA (United States)

We present magnetic susceptibility, resistivity, specific heat, and thermoelectric power measurements on (Ce_1-xLa_x)Cu₂Ge₂ 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)Cu₂Ge₂ follows the theoretical prediction based on the molecular field calculation for the S = 1/2 resonant level model.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358; FA9550-09-1-0603

OSTI ID:: 1227369

Alternate ID(s):: OSTI ID: 1184053

Report Number(s):: IS-J-8644; PRLTAO

Journal Information:: Physical Review Letters, Vol. 114, Issue 23; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Cited By (3)

Breakdown of coherence in Kondo alloys: crucial role of concentration versus band filling Burdin, Sébastien; Lacroix, Claudine Journal of Physics: Condensed Matter, Vol. 31, Issue 39 https://doi.org/10.1088/1361-648x/ab2701	journal	July 2019
Emergent Coherent Lattice Behavior in Kondo Nanosystems Raczkowski, Marcin; Assaad, Fakher F. arXiv https://doi.org/10.48550/arxiv.1809.00930	text	January 2018
Breakdown of coherence in Kondo alloys: crucial role of concentration vs band filling Burdin, Sébastien; Lacroix, Claudine arXiv https://doi.org/10.48550/arxiv.1810.05383	text	January 2018

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Title: Remarkably robust and correlated coherence and antiferromagnetism in (Ce_1-xLa_x)Cu₂Ge₂