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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 BaF e 2 ( A s 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 BaF e 2 A s 2 display a sharp peak at the AFM-structural transitions. A kink in the entropy of annealed BaF e 2 A s 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 BaF e 2 A s 2 and BaF e 2 ( A s 0.7 P 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.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1385581
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 9; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons, thermal conductivity, energy storage (including batteries and capacitors), superconductivity, defects, spin dynamics

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. Sun . "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_1385581,
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 BaF e 2 ( A s 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 BaF e 2 A s 2 display a sharp peak at the AFM-structural transitions. A kink in the entropy of annealed BaF e 2 A s 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 BaF e 2 A s 2 and BaF e 2 ( A s 0.7 P 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.},
doi = {10.1103/PhysRevB.91.094512},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 9,
volume = 91,
place = {United States},
year = {2015},
month = {3}
}

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