Electronic Inhomogeneity and Breakdown of the Universal Thermal Conductivity of Cuprate Superconductors

X. F. Sun; S. Ono; Yasushi Abe; Seiki Komiya; Kouji Segawa; Yoichi Ando

doi:10.1103/PhysRevLett.96.017008

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Electronic Inhomogeneity and Breakdown of the Universal Thermal Conductivity of Cuprate Superconductors

X. F. Sun, S. Ono, Yasushi Abe, Seiki Komiya, Kouji Segawa, Yoichi Ando

DOI 10.1103/PhysRevLett.96.017008 · Physical Review Letters

T1

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Abstract

We report systematic, high-precision measurements of the low-T (down to 70 mK) thermal conductivity κ of YBa2Cu3Oy, La2−xSrxCuO4, and Bi2Sr2CaCu2O8+δ. Careful examinations of the Zn- and hole-doping dependences of the residual thermal conductivity κ0/T, as well as the in-plane anisotropy of κ0/T in Bi2Sr2CaCu2O8+δ, indicate a breakdown of the universal thermal conductivity, a notable theoretical prediction for d-wave superconductors. Our results point to an important role of electronic inhomogeneities, which are not considered in the standard perturbation theory for thermal conductivity, in the underdoped to optimally doped regime.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	94	Pressure not reported	onset
Bi2Sr2Ca1-yDyyCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	81	Pressure not reported	onset
Bi2Sr2Ca1-yDyyCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	45	Pressure not reported	onset
YBa2(Cu1-zZnz)3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCu1-zZnzO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2Ca(Cu1-zZnz)2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown