Specific Heat of Ce(1-x)La(x)RhIn(5) in Zero and Applied Magnetic Field: A Very Rich Phase Diagram

TL;DR

This study investigates the specific heat and magnetization of Ce(1-x)La(x)RhIn(5), revealing non-Fermi liquid behavior and field-induced anomalies consistent with Griffiths phase theory, indicating complex magnetic and electronic interactions.

Contribution

It provides detailed experimental evidence supporting Griffiths phase behavior in Ce(1-x)La(x)RhIn(5), including field-dependent specific heat and magnetization consistent with recent theoretical models.

Findings

Gamma of about 100 mJ/moleK^2 consistent with dHvA results

Upturns in C/T and chi indicating Griffiths phase non-Fermi liquid behavior

Field-induced anomalies matching Griffiths phase theory predictions

Abstract

Specific heat and magnetization results as a function of field on single- and poly-crystalline samples of Ce(1-x)La(x)RhIn(5) show 1.) a specific heat gamma of about 100 mJ/moleK^2 (in agreement with recent dHvA results of Alvers et al.); 2.) upturns at low temperatures in C/T and chi that fit a power law behavior (<=> Griffiths phase non-Fermi liquid behavior); 3.) a field induced anomaly in C/T as well as M vs H behavior in good agreement with the recent Griffiths phase theory of Castro Neto and Jones, where M~H at low field, M ~ H^lambda above a crossover field, C/T ~ T^(-1+lambda) at low field, and C/T ~ (H^(2+lambda/2)/T^(3-lambda/2))*exp(-mu(eff)H/T) above the same crossover field as determined in the magnetization and where lambda is independently determined from the temperature dependence of chi at low temperatures, chi ~ T^(-1+lambda) and low fields.