Nanoscale heterogeneity induced by nonmagnetic Zn dopants in the quantum critical metal CeCoIn5: 115In NQR/NMR and 59Co NMR study
- Japan Atomic Energy Agency (JAEA), Tokai (Japan)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Ibaraki University, Mito (Japan)
We report antiferromagnetism in a prototypical quantum critical metal CeCoIn5 is known to be induced by slight substitutions of nonmagnetic Zn atoms for In. In nominally 7% Zn-substituted CeCoIn5, an antiferromagnetic (AFM) state coexists with heavy fermion superconductivity. Heterogeneity of the electronic states is investigated in Zn-doped CeCoIn5 by means of nuclear quadrupole and magnetic resonances (NQR and NMR). Site-dependent NQR relaxation rates 1/T1 indicate that the AFM state is locally nucleated around Zn substituents in the matrix of a heavy fermion state, and percolates through the bulk at the AFM transition temperature TN. At lower temperatures, an anisotropic superconducting (SC) gap below the SC transition temperature Tc, and the SC state permeates through the AFM regions via a SC proximity effect. Applying an external magnetic field induces a spin-flop transition near 5T, reducing the volume of the AFM regions. Consequently, a short-ranged inhomogeneous AFM state survives and coexists with a paramagnetic Fermi liquid state at high fields.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); Japan Society for the Promotion of Science (JSPS); Japan Atomic Energy Agency (JAEA)
- Grant/Contract Number:
- 89233218CNA000001; DMR-1644779; JP16KK0106; JP17K05522; JP17K05529; JP20K03852
- OSTI ID:
- 1884757
- Report Number(s):
- LA-UR-21-23885; TRN: US2308111
- Journal Information:
- Physical Review. B, Vol. 104, Issue 8; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
antiferromagnetism
superconductivity
antiferromagnets
heavy-fermion systems
single crystal materials
solid solutions
strongly correlated systems unconventional superconductors
density functional theory
nuclear magnetic resonance
nuclear quadrupole resonance