Journal
PHYSICAL REVIEW B
Volume 79, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.180505
Keywords
critical points; doping; electrical resistivity; Fermi surface; fluctuations in superconductors; high-temperature superconductors; lanthanum compounds; neodymium compounds; strontium compounds; superconducting transitions; thermoelectric power
Funding
- Canada Research Chair
- NSERC
- FQRNT
- CIfAR
- NSF
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0904282, GRANTS:13742416] Funding Source: National Science Foundation
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The thermopower S of the high-T-c superconductor La1.6-xNd0.4SrxCuO4 was measured as a function of temperature T near its quantum critical point, the critical hole doping p(star) where all characteristic temperatures go to zero. Just above p(star), S/T varies as ln(1/T) over a decade of temperature. Below p(star), S/T undergoes a large increase at low temperature. As with the temperature dependence of the resistivity, which is linear just above p(star) and undergoes a large upturn at low temperature, these are typical signatures of a quantum phase transition. This suggests that p(star) is a quantum critical point below which some order sets in, causing a reconstruction of the Fermi surface, whose fluctuations are presumably responsible for the linear-T resistivity and logarithmic thermopower. All the evidence points to stripe order, a form of spin/charge modulation known to exist in this material.
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