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Tuning the pressure-induced superconducting phase in doped CeRhIn5.

L Mendonça Ferreira¹, T Park, V Sidorov

¹Instituto de Física Gleb Wataghin, UNICAMP, C.P. 6165, 13083-970, Campinas, Brazil.

Physical Review Letters

|September 4, 2008

Summary

Doping CeRhIn5 with tin (Sn) or lanthanum (La) alters the pressure-temperature phase diagram, affecting superconductivity. The Kondo coupling strength is key to understanding the pressure range for superconductivity in these materials.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Materials

Background:

CeRhIn5 is a heavy fermion superconductor exhibiting antiferromagnetism.
Tuning the electronic properties of CeRhIn5 through doping is crucial for understanding its superconducting mechanisms.
Previous studies established the pressure-temperature phase diagram of pure CeRhIn5.

Purpose of the Study:

To investigate the effects of tin (Sn) and lanthanum (La) doping on the electronic properties and phase diagram of CeRhIn5.
To compare the pressure-temperature phase diagrams of doped CeRhIn5 with the parent compound.
To elucidate the role of the on-site Kondo coupling in determining the pressure range for superconductivity.

Main Methods:

Heat capacity measurements under varying pressure and temperature.
Electrical resistivity measurements under varying pressure and temperature.
Synthesis and characterization of specific Sn- and La-doped CeRhIn5 samples.

Main Results:

Two doped samples, Ce(0.90)La(0.10)RhIn5 and CeRhIn(4.84)Sn(0.16), were studied, both exhibiting a Néel temperature (TN) of 2.8 K.
Sn doping shifts the pressure-temperature phase diagram to lower pressures.
La doping shifts the pressure-temperature phase diagram to higher pressures.

Conclusions:

The pressure-temperature phase diagrams of Sn- and La-doped CeRhIn5 differ significantly from the pure compound.
The strength of the on-site Kondo coupling is identified as the critical energy scale governing the pressure range for superconductivity in CeRhIn5.
Doping provides a powerful tool to tune the superconducting properties of CeRhIn5 by modifying the Kondo coupling.