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Title: Antiferromagnetic and nematic phase transitions in BaF e 2 ( A s 1 - x P x ) 2 studied by ac microcalorimetry and SQUID magnetometry

Abstract

We study the antiferromagnetic (AFM) and structural phase transitions in single-crystal BaFe 2(As 1-x P x) 2 (x = 0, 0.3) at temperatures T N and T S, respectively, by high-resolution ac microcalorimetry and SQUID magnetometry. The specific heat measurements of both as-grown and annealed BaFe 2As 2 display a sharp peak at the AFMs-tructural transitions. A kink in the entropy of annealed BaFe 2As 2 gives evidence for splitting of the two transitions by approximately 0.5 K. No additional features could be identified in the specific heat of both BaFe 2As 2 and BaFe 2(As 0.7P 0.3) 2 in the temperature regions around T* > T S where torque measurements [S. Kasahara et al., Nature 486, 382 (2012)] had revealed the "true" nematic phase transition, even though the Ginzburg-Landau model used to fit the magnetic torque data indicates that the expected thermal anomaly should be easily observable with our experimental resolution.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1355773
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 91; Journal Issue: 9
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Luo, X., Stanev, V., Shen, B., Fang, L., Ling, X. S., Osborn, R., Rosenkranz, S., Benseman, T. M., Divan, R., Kwok, W. -K., and Welp, U. Antiferromagnetic and nematic phase transitions in BaFe2(As1-xPx)2 studied by ac microcalorimetry and SQUID magnetometry. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.91.094512.
Luo, X., Stanev, V., Shen, B., Fang, L., Ling, X. S., Osborn, R., Rosenkranz, S., Benseman, T. M., Divan, R., Kwok, W. -K., & Welp, U. Antiferromagnetic and nematic phase transitions in BaFe2(As1-xPx)2 studied by ac microcalorimetry and SQUID magnetometry. United States. doi:10.1103/PhysRevB.91.094512.
Luo, X., Stanev, V., Shen, B., Fang, L., Ling, X. S., Osborn, R., Rosenkranz, S., Benseman, T. M., Divan, R., Kwok, W. -K., and Welp, U. Mon . "Antiferromagnetic and nematic phase transitions in BaFe2(As1-xPx)2 studied by ac microcalorimetry and SQUID magnetometry". United States. doi:10.1103/PhysRevB.91.094512.
@article{osti_1355773,
title = {Antiferromagnetic and nematic phase transitions in BaFe2(As1-xPx)2 studied by ac microcalorimetry and SQUID magnetometry},
author = {Luo, X. and Stanev, V. and Shen, B. and Fang, L. and Ling, X. S. and Osborn, R. and Rosenkranz, S. and Benseman, T. M. and Divan, R. and Kwok, W. -K. and Welp, U.},
abstractNote = {We study the antiferromagnetic (AFM) and structural phase transitions in single-crystal BaFe2(As1-x Px)2 (x = 0, 0.3) at temperatures TN and TS, respectively, by high-resolution ac microcalorimetry and SQUID magnetometry. The specific heat measurements of both as-grown and annealed BaFe2As2 display a sharp peak at the AFMs-tructural transitions. A kink in the entropy of annealed BaFe2As2 gives evidence for splitting of the two transitions by approximately 0.5 K. No additional features could be identified in the specific heat of both BaFe2As2 and BaFe2(As0.7P0.3)2 in the temperature regions around T* > TS where torque measurements [S. Kasahara et al., Nature 486, 382 (2012)] had revealed the "true" nematic phase transition, even though the Ginzburg-Landau model used to fit the magnetic torque data indicates that the expected thermal anomaly should be easily observable with our experimental resolution.},
doi = {10.1103/PhysRevB.91.094512},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 9,
volume = 91,
place = {United States},
year = {Mon Mar 23 00:00:00 EDT 2015},
month = {Mon Mar 23 00:00:00 EDT 2015}
}