Proximity effect thermometer for local electron temperature measurements on mesoscopic samples

Applied Physics Letters

Volumn 75, Issue 22, 1999, Pages 3554-3556

  Aumentado, J ^a   Chandrasekhar, V ^a   Eom, J ^b   Baldo, P M ^c   Rehn, L E ^c  

^a NORTHWESTERN UNIVERSITY   (United States)

^b UNIVERSITY OF CHICAGO   (United States)

^c ARGONNE NATIONAL LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000746068     PISSN: 00036951     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.125386     Document Type: Article

References (15)

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7. J. Eom, G. Neuttiens, C. Strunk, C. Van Haesendonck, Y. Bruynseraede, and V. Chandrasekhar, Phys. Rev. Lett. 77, 2276 (1996); G. Neuttiens, J. Eom, C. Strunk, H. Pattyn, C. Van Haesendonck, Y. Bruynseraede, and V. Chandrasekhar, Europhys. Lett. 42, 185 (1998).
8. 2 at energies of 40 and 160 keV, respectively.
9. P. Charlat, H. Courtois, Ph. Gandit, D. Mailly, and B. Pannetier, Phys. Rev. Lett. 77, 4950 (1996).
10. The resistance of our thermometers rises above the normal state resistance, unlike the samples in Ref. 8. The reason for this is unclear at present, but it may be due to repulsive electron-electron interactions in the normal metal.
11. T. H. Stoof and Y. Nazarov, Phys. Rev. Lett. 76, 823 (1996).
12. See, for example, B. L. Altshuler, A. G. Aronov, and D. E. Khmelnitskii, "Coherent effects in disordered conductors," in Quantum Theory of Solids, edited by I. M. Lifshits (Mir, Moscow, 1982).
13. The spatial dependence of the electron temperature can be described by a simple heat flow equation. See, for example, K. E. Nagaev, Phys. Rev. B 52, 4740 (1995). The presence of leads attached to the center of the heater wire should have a strong heat sinking effect, creating a local minimum in the local electron temperature profile along the heater wire, which is taken into account in our numerical simulations.
14. These functional forms [Eqs. (1) and (2)] were empirically determined to best describe the data with the fewest number of fitting parameters.
15. For the bottom thermometer, the experimental R(I) was offset by 0.002 Ω to match the zero bias resistance with the measured temperature dependent resistance at 97.5 mK before performing the analysis in order to account for an offset in the measurement.