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Title: Thermodynamic Nature of the Antiferromagnetic Transition in Na xCoO 2

Abstract

High-resolution thermal expansion measurements of single-crystalline Na0.80CoO2 reveal continuous behavior of the paramagnetic-antiferromagnetic phase transition at TM=21.7(1) K with critical exponent a=0.18(2). The thermal expansion is found to be highly anisotropic. Thermodynamic analysis provides the hydrostatic pressure derivative dTM/dP=+4.6(2) K/GPa. Similar measurements and analysis are presented for Na0.75CoO2.

Authors:
 [1];  [1];  [1];  [2];  [3];  [3];  [3]
  1. Montana State University
  2. National Center for Biotechnology Information
  3. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1003682
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 74; Journal Issue: 13
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; HYDROSTATICS; THERMAL EXPANSION; THERMODYNAMICS

Citation Formats

dos Santos, C. A. M., Neumeier, J. J., Bollinger, R. K., Yu, Yi-Kuo, Jin, Rongying, Mandrus, David, and Sales, Brian C. Thermodynamic Nature of the Antiferromagnetic Transition in NaxCoO2. United States: N. p., 2006. Web. doi:10.1103/PhysRevB.74.132402.
dos Santos, C. A. M., Neumeier, J. J., Bollinger, R. K., Yu, Yi-Kuo, Jin, Rongying, Mandrus, David, & Sales, Brian C. Thermodynamic Nature of the Antiferromagnetic Transition in NaxCoO2. United States. doi:10.1103/PhysRevB.74.132402.
dos Santos, C. A. M., Neumeier, J. J., Bollinger, R. K., Yu, Yi-Kuo, Jin, Rongying, Mandrus, David, and Sales, Brian C. Sun . "Thermodynamic Nature of the Antiferromagnetic Transition in NaxCoO2". United States. doi:10.1103/PhysRevB.74.132402.
@article{osti_1003682,
title = {Thermodynamic Nature of the Antiferromagnetic Transition in NaxCoO2},
author = {dos Santos, C. A. M. and Neumeier, J. J. and Bollinger, R. K. and Yu, Yi-Kuo and Jin, Rongying and Mandrus, David and Sales, Brian C},
abstractNote = {High-resolution thermal expansion measurements of single-crystalline Na0.80CoO2 reveal continuous behavior of the paramagnetic-antiferromagnetic phase transition at TM=21.7(1) K with critical exponent a=0.18(2). The thermal expansion is found to be highly anisotropic. Thermodynamic analysis provides the hydrostatic pressure derivative dTM/dP=+4.6(2) K/GPa. Similar measurements and analysis are presented for Na0.75CoO2.},
doi = {10.1103/PhysRevB.74.132402},
journal = {Physical Review B},
number = 13,
volume = 74,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}