A 10 mK scanning tunneling microscope operating in ultra high vacuum and high magnetic fields

被引：71

作者：

Assig, Maximilian ^{[1
]}

Etzkorn, Markus ^{[1
]}

Enders, Axel ^{[1
]}

Stiepany, Wolfgang ^{[1
]}

Ast, Christian R. ^{[1
]}

Kern, Klaus ^{[1
,2
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Ecole Polytech Fed Lausanne, Inst Phys Mat Condensee, CH-1015 Lausanne, Switzerland

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2013年 / 84卷 / 03期

关键词：

MILLIKELVIN TEMPERATURE-RANGE; CERMET RESISTORS; SUPERCONDUCTIVITY; THERMOMETERS; SPECTROSCOPY; FILMS; GAP;

D O I：

10.1063/1.4793793

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We present design and performance of a scanning tunneling microscope (STM) that operates at temperatures down to 10 mK providing ultimate energy resolution on the atomic scale. The STM is attached to a dilution refrigerator with direct access to an ultra high vacuum chamber allowing in situ sample preparation. High magnetic fields of up to 14 T perpendicular and up to 0.5 T parallel to the sample surface can be applied. Temperature sensors mounted directly at the tip and sample position verified the base temperature within a small error margin. Using a superconducting Al tip and a metallic Cu(111) sample, we determined an effective temperature of 38 +/- 1 mK from the thermal broadening observed in the tunneling spectra. This results in an upper limit for the energy resolution of Delta E = 3.5k(B)T = 11.4 +/- 0.3 mu eV. The stability between tip and sample is 4 pm at a temperature of 15 mK as demonstrated by topography measurements on a Cu(111) surface. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793793]

引用

页数：9

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