Remarkably robust and correlated coherence and antiferromagnetism in (Ce1-xLax)Cu2Ge2
- Iowa State Univ., Ames, IA (United States)
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.
- 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
Web of Science
Breakdown of coherence in Kondo alloys: crucial role of concentration versus band filling
|
journal | July 2019 |
Emergent Coherent Lattice Behavior in Kondo Nanosystems | text | January 2018 |
Breakdown of coherence in Kondo alloys: crucial role of concentration vs band filling | text | January 2018 |
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