2011
DOI: 10.1103/physrevb.83.094517
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Doping dependence of phase-separation morphology in (Sr,K)Fe2As2

Abstract: The effects of the possible phase separation on macroscopic transport properties are explored in (Sr,K)Fe 2 As 2 . Three probes, the low-field shielding 4πχ ZFC , the reversible diamagnetization M SC at 5 T, and the specific heat C p , with different characteristic length scales on the order of 10 3 , 10, and 10 0 nm, respectively, were used to examine several (Sr 1−x K x )Fe 2 As 2 samples. The data from different probes should be consistent if the sample can be regarded as mesoscopically homogeneous. While t… Show more

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“…(for LaFeAsO, there are three optical modes at 100, 180 and 290 cm-1) [53][54][55][56][57] The parameters extracted from this fit were γ = 8.18 (19) mJ/molK, ΘD = 324 (1) K, ΘE = 823 J/molK for LaFeAsO and SrFeAsF, respectively), 28,58 and smaller than those of conventional 122-and 11-type compounds (e.g., 1.0 and 3.2 J/molK for SrFe2As2 and FeTe, respectively). 25,59 In the normal relaxation method, the specific heat at each temperature is obtained by fitting the temperature-time relaxation curve.…”
Section: Resultsmentioning
confidence: 99%
“…(for LaFeAsO, there are three optical modes at 100, 180 and 290 cm-1) [53][54][55][56][57] The parameters extracted from this fit were γ = 8.18 (19) mJ/molK, ΘD = 324 (1) K, ΘE = 823 J/molK for LaFeAsO and SrFeAsF, respectively), 28,58 and smaller than those of conventional 122-and 11-type compounds (e.g., 1.0 and 3.2 J/molK for SrFe2As2 and FeTe, respectively). 25,59 In the normal relaxation method, the specific heat at each temperature is obtained by fitting the temperature-time relaxation curve.…”
Section: Resultsmentioning
confidence: 99%