TY - JOUR
T1 - Resistivity of the high-temperature metallic phase of VO2
AU - Allen, Philip B.
AU - Wentzcovitch, Renata M.
AU - Schulz, Werner W.
AU - Canfield, Paul C.
PY - 1993
Y1 - 1993
N2 - Measurements are reported on the electrical resistivity ρ(T) along the c axis of a single crystal of VO2, from the metal-insulator transition at T=333 K up to 840 K. The temperature dependence is very linear, and a fit to Bloch-Grüneisen theory gives a residual resistivity ρ0=65 μΩ cm and a ratio ρ(840 K)/ρ0=8. With the help of a local-density- approximation band-structure calculation, we further pursue the conventional (Bloch-Boltzmann) interpretation by extracting the electron-phonon coupling constant λ=1.1 and the mean free path l(800 K)=3.3. The short mean free path implies that the conventional interpretation is internally inconsistent. The most likely explanation is that unknown internal damage (e.g., cracks) has altered the effective cross section of the sample, causing the measured resistivity to be overestimated by a factor 3. Another possibility is that, in common with the normal state of copper oxide superconductors, metallic VO2 may not be a conventional Fermi liquid.
AB - Measurements are reported on the electrical resistivity ρ(T) along the c axis of a single crystal of VO2, from the metal-insulator transition at T=333 K up to 840 K. The temperature dependence is very linear, and a fit to Bloch-Grüneisen theory gives a residual resistivity ρ0=65 μΩ cm and a ratio ρ(840 K)/ρ0=8. With the help of a local-density- approximation band-structure calculation, we further pursue the conventional (Bloch-Boltzmann) interpretation by extracting the electron-phonon coupling constant λ=1.1 and the mean free path l(800 K)=3.3. The short mean free path implies that the conventional interpretation is internally inconsistent. The most likely explanation is that unknown internal damage (e.g., cracks) has altered the effective cross section of the sample, causing the measured resistivity to be overestimated by a factor 3. Another possibility is that, in common with the normal state of copper oxide superconductors, metallic VO2 may not be a conventional Fermi liquid.
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U2 - 10.1103/PhysRevB.48.4359
DO - 10.1103/PhysRevB.48.4359
M3 - Article
AN - SCOPUS:0001478046
VL - 48
SP - 4359
EP - 4363
JO - Physical Review B
JF - Physical Review B
SN - 0163-1829
IS - 7
ER -