The scaled-invariant Planckian metal and quantum criticality in Ce1−xNdxCoIn5

Journal Article · 02 February 2023 · Nature Communications

DOI: https://doi.org/10.1038/s41467-023-36194-9 · OSTI ID:1923422

Chang, Yung-Yeh; Lei, Hechang ; Petrovic, C. ; Chung, Chung-Hou

Abstract The mysterious Planckian metal state, showing perfect T -linear resistivity associated with universal scattering rate, 1/ τ  =  α k _B T /ℏ with α  ~ 1, has been observed in the normal state of various strongly correlated superconductors close to a quantum critical point. However, its microscopic origin and link to quantum criticality remains an outstanding open problem. Here, we observe quantum-critical T / B -scaling of the Planckian metal state in resistivity and heat capacity of heavy-electron superconductor Ce _{1− x} Nd _x CoIn ₅ in magnetic fields near the edge of antiferromagnetism at the critical doping x _c  ~ 0.03. We present clear experimental evidences of Kondo hybridization being quantum critical at x _c . We provide a generic microscopic mechanism to qualitatively account for this quantum critical Planckian state within the quasi-two dimensional Kondo-Heisenberg lattice model near Kondo breakdown transition. We find α is a non-universal constant and depends inversely on the square of Kondo hybridization strength.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: Taiwan Ministry of Science and Technology (MOST); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
• Grant/Contract Number: SC0012704
• OSTI ID: 1923422
• Report Number(s): BNL-224255-2023-JAAM; 581; PII: 36194
• Journal Information: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723
• Publisher: Nature Publishing GroupCopyright Statement
• Country of Publication: United Kingdom
• Language: English