Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A 350 mK, 9 T scanning tunneling microscope for the study of
  superconducting thin films and single crystals   We report the construction and performance of a low temperature, high field
scanning tunneling microscope (STM) operating down to 350mK and in magnetic
fields up to 9T, with thin film deposition and in-situ cleaving capabilities.
The main focus lies on the simple design of STM head allowing top loading of
the sample and innovative sample holder design that allows us to get
spectroscopic data on superconducting thin films grown in-situ on insulating
substrates. Other design details on sample transport, chamber and vibration
isolation scheme are also described. We demonstrate the capability of our
instrument through the atomic resolution imaging and spectroscopy on NbSe2
single crystal and spectroscopic maps obtained on homogeneously disordered NbN
thin film.

21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph