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Title: Use of Cernox thermometers in AC specific heat measurements under pressure

Abstract

We report on the resistance behavior of bare-chip Cernox thermometers under pressures up to 2 GPa, generated in a piston-cylinder pressure cell. Our results clearly show that Cernox thermometers, frequently used in low-temperature experiments due to their high sensitivity, remain highly sensitive even under applied pressure. We show that these thermometers are therefore ideally suited for measurements of heat capacity under pressure utilizing an ac oscillation technique up to at least 150 K. Our Cernox-based system is very accurate in determining changes in the specific heat as a function of pressure as demonstrated by measurements of the heat capacity on three different test cases: (i) the superconducting transition in elemental Pb ( Tc = 7.2 K), (ii) the antiferromagnetic transition in the rare-earth compound GdNiGe 3 ( TN = 26 K), and (iii) the structural/magnetic transition in the iron-pnictide BaFe 2As 2 ( Ts,N = 130 K). In conclusion, the chosen examples demonstrate the versatility of our technique for measuring the specific heat under the pressure of various condensed-matter systems with very different transition temperatures as well as amounts of removed entropy.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1495408
Report Number(s):
IS-J-9856
Journal ID: ISSN 0034-6748
Grant/Contract Number:  
AC02-07CH11358; GBMF4411
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 90; Journal Issue: 2; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Gati, Elena, Drachuck, Gil, Xiang, Li, Wang, Lin -Lin, Bud’ko, Sergey L., and Canfield, Paul C. Use of Cernox thermometers in AC specific heat measurements under pressure. United States: N. p., 2019. Web. doi:10.1063/1.5084730.
Gati, Elena, Drachuck, Gil, Xiang, Li, Wang, Lin -Lin, Bud’ko, Sergey L., & Canfield, Paul C. Use of Cernox thermometers in AC specific heat measurements under pressure. United States. doi:10.1063/1.5084730.
Gati, Elena, Drachuck, Gil, Xiang, Li, Wang, Lin -Lin, Bud’ko, Sergey L., and Canfield, Paul C. Tue . "Use of Cernox thermometers in AC specific heat measurements under pressure". United States. doi:10.1063/1.5084730.
@article{osti_1495408,
title = {Use of Cernox thermometers in AC specific heat measurements under pressure},
author = {Gati, Elena and Drachuck, Gil and Xiang, Li and Wang, Lin -Lin and Bud’ko, Sergey L. and Canfield, Paul C.},
abstractNote = {We report on the resistance behavior of bare-chip Cernox thermometers under pressures up to 2 GPa, generated in a piston-cylinder pressure cell. Our results clearly show that Cernox thermometers, frequently used in low-temperature experiments due to their high sensitivity, remain highly sensitive even under applied pressure. We show that these thermometers are therefore ideally suited for measurements of heat capacity under pressure utilizing an ac oscillation technique up to at least 150 K. Our Cernox-based system is very accurate in determining changes in the specific heat as a function of pressure as demonstrated by measurements of the heat capacity on three different test cases: (i) the superconducting transition in elemental Pb (Tc = 7.2 K), (ii) the antiferromagnetic transition in the rare-earth compound GdNiGe3 (TN = 26 K), and (iii) the structural/magnetic transition in the iron-pnictide BaFe2As2 (Ts,N = 130 K). In conclusion, the chosen examples demonstrate the versatility of our technique for measuring the specific heat under the pressure of various condensed-matter systems with very different transition temperatures as well as amounts of removed entropy.},
doi = {10.1063/1.5084730},
journal = {Review of Scientific Instruments},
number = 2,
volume = 90,
place = {United States},
year = {2019},
month = {2}
}

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Works referenced in this record:

Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set
journal, July 1996


Measurement of low?temperature specific heat
journal, January 1983

  • Stewart, G. R.
  • Review of Scientific Instruments, Vol. 54, Issue 1, p. 1-11
  • DOI: 10.1063/1.1137207