Publications (2)7.37 Total impact
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Article: Tuning the pressure-induced superconducting phase in doped CeRhIn5.
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ABSTRACT: Pressure- and temperature-dependent heat capacity and electrical resistivity experiments on Sn- and La-doped CeRhIn5 are reported for two samples with specific concentrations, Ce(0.90)La(0.10)RhIn5 and CeRhIn(4.84)Sn(0.16), which present the same TN=2.8 K. The obtained P-T phase diagrams for doped CeRhIn5 compared to that for the pure compound show that Sn doping shifts the diagram to lower pressures while La doping does exactly the opposite, indicating that the important energy scale to define the pressure range for superconductivity in CeRhIn5 is the strength of the on-site Kondo coupling.Physical Review Letters 08/2008; 101(1):017005. · 7.37 Impact Factor -
Article: Local Structure and Site Occupancy in Cd and Hg-doped CeTIn5 (T=Co, Rh, Ir)
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ABSTRACT: Local structure measurements using the extended x-ray absorption fine-structure (EXAFS) technique were performed from the In K, Cd K, and Hg L3 edges on samples of CeCo(In1-xCdx)5 (0.5%>=x >=3.1%) and CeT(In1-xHgx)5 (T=Co, Rh, Ir, 0.7%>=x >=3.5%). Fits indicate no measurable change in the bulk local structure with these substituents. In contrast, the local structure data around the substituent atoms indicates about fCd^Co=44(3)% of Cd atoms reside on In(1) sites, similar to previous results [fSn^Co=55(5)%] for Sn in CeCo(In1-xSnx)5. Mercury has an even stronger preference for the In(1) site, with fHg^Co=71(5)%, fHg^Rh=97(3)%, and fHg^Ir=55(5)%, although other phases appear to be present in the CeIr(In1-xHgx)5 material. Small distortions from the parent structure are also observed around the substituent atoms. These results will be related to the sharp decrease in the superconducting transition temperature with x.
