Antiferromagnetic spin correlations and pseudogaplike behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity

Cui, J.; Roy, B.; Tanatar, M. A.; Ran, S.; Bud'ko, S. L.; Prozorov, R.; Canfield, P. C.; Furukawa, Y.

doi:10.1103/PhysRevB.92.184504

Antiferromagnetic spin correlations and pseudogaplike behavior in Ca(Fe_1-xCo_x)₂As₂ studied by⁷⁵As nuclear magnetic resonance and anisotropic resistivity

Journal Article · Thu Nov 05 23:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.184504· OSTI ID:1234536

Cui, J. ^[1]; Roy, B. ^[1]; Tanatar, M. A. ^[1]; Ran, S. ^[1]; Bud'ko, S. L. ^[1]; Prozorov, R. ^[1]; Canfield, P. C. ^[1]; Furukawa, Y. ^[1]

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

We report ⁷⁵As nuclear magnetic resonance (NMR) measurements of single-crystalline Ca(Fe_1–xCo_x)₂As₂ (x=0.023, 0.028, 0.033, and 0.059) annealed at 350°C for 7 days. From the observation of a characteristic shape of ⁷⁵As NMR spectra in the stripe-type antiferromagnetic (AFM) state, as in the case of x=0 (T_N=170 K), clear evidence for the commensurate AFM phase transition with the concomitant structural phase transition is observed in x=0.023 (T_N=106 K) and x=0.028 (T_N=53 K). Through the temperature dependence of the Knight shifts and the nuclear spin lattice relaxation rates (1/T₁), although stripe-type AFM spin fluctuations are realized in the paramagnetic state as in the case of other iron pnictide superconductors, we found a gradual decrease of the AFM spin fluctuations below a crossover temperature T* that was nearly independent of Co-substitution concentration, and it is attributed to a pseudogaplike behavior in the spin excitation spectra of these systems. The T* feature finds correlation with features in the temperature-dependent interplane resistivity, _{ρ_c}(T), but not with the in-plane resistivity _{ρ_a}(T). The temperature evolution of anisotropic stripe-type AFM spin fluctuations is tracked in the paramagnetic and pseudogap phases by the 1/T₁ data measured under magnetic fields parallel and perpendicular to the c axis. As a result, based on our NMR data, we have added a pseudogaplike phase to the magnetic and electronic phase diagram of Ca(Fe_1–xCo_x)₂As₂.

View Accepted Manuscript (DOE)

Research Organization:: Ames Lab. (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1234536

Alternate ID(s):: OSTI ID: 1225392

Report Number(s):: IS-J--8859

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 18 Vol. 92; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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