English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Effective masses of electrons in n-type SrTiO3 determined from low-temperature specific heat capacities

Ahrens, M., Merkle, R., Rahmati, B., & Maier, J. (2007). Effective masses of electrons in n-type SrTiO3 determined from low-temperature specific heat capacities. Physica B, 393(1-2), 239-248.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Ahrens, M.1, Author           
Merkle, R.1, Author           
Rahmati, B.1, Author           
Maier, J.1, Author           
Affiliations:
1Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370483              

Content

show
hide
Free keywords: effective mass; band structure; phonon states; heat capacity; defect levels
 Abstract: We measured the low-temperature specific heat of Nb-doped and reduced (hydrogen treated) n-type SrTiO3 ranging from about 1.5 to 100 K. Displaying the data by the usual C-p/T vs. T-2 plot and applying a linear fit to the proper temperature range, the electronic density-of-states effective mass MD is derived resulting in m(D)/m(0) = 1.9 (+/- 0.1) for polycrystalline SrTiO3:Nb (5 at%) and m(D)/m(0) = 1.8 (+/- 0.2) for a reduced SrTiO3 single crystal. These results are in reasonable agreement with theoretical predictions, while in parts significantly deviating from experimentally obtained values, presented in literature. As far as specific heat measurements are concerned, we suggest that the higher values stated in most literature studies are due to an incorrect evaluation of specific heat data, as in n-type SrTiO3 one has to take care about a specific heat anomaly below about 5 K. Thermo-gravimetric oxidation of a reduced crystal combined with a Hall effect measurement leads to the conclusion that oxygen vacancies in this sample were doubly ionised even at liquid helium temperatures. (c) 2007 Elsevier B.V. All rights reserved.

Details

show
hide
Language(s): eng - English
 Dates: 2007
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 338593
ISI: 000246242500040
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Physica B
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 393 (1-2) Sequence Number: - Start / End Page: 239 - 248 Identifier: ISSN: 0921-4526