Antiferromagnetic and nematic phase transitions in BaFe2(As1-xPx)2 studied by ac microcalorimetry and SQUID magnetometry

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.

doi:10.1103/PhysRevB.91.094512

Antiferromagnetic and nematic phase transitions in $BaF e_{2} {(A s_{1 - x} P_{x})}_{2}$ studied by ac microcalorimetry and SQUID magnetometry

Journal Article · Mon Mar 23 04:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.094512· OSTI ID:1355773

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.

We study the antiferromagnetic (AFM) and structural phase transitions in single-crystal BaFe₂(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 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(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.

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1355773

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 9 Vol. 91; ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Superconductivity at 38 K in the Iron Arsenide ( Ba 1 − x K x ) Fe 2 As 2 Rotter, Marianne; Tegel, Marcus; Johrendt, Dirk Physical Review Letters, Vol. 101, Issue 10 https://doi.org/10.1103/PhysRevLett.101.107006	journal	September 2008
Nematic State of Pnictides Stabilized by Interplay between Spin, Orbital, and Lattice Degrees of Freedom Liang, Shuhua; Moreo, Adriana; Dagotto, Elbio Physical Review Letters, Vol. 111, Issue 4 https://doi.org/10.1103/physrevlett.111.047004	journal	July 2013
Nematic Susceptibility of Hole-Doped and Electron-Doped Ba F e 2 As 2 Iron-Based Superconductors from Shear Modulus Measurements Böhmer, A. E.; Burger, P.; Hardy, F. Physical Review Letters, Vol. 112, Issue 4 https://doi.org/10.1103/physrevlett.112.047001	journal	January 2014
Spin-density-wave anomaly at 140 K in the ternary iron arsenide BaFe 2 As 2 Rotter, Marianne; Tegel, Marcus; Johrendt, Dirk Physical Review B, Vol. 78, Issue 2 https://doi.org/10.1103/physrevb.78.020503	journal	July 2008
Nonanalytic Spin Susceptibility of a Fermi Liquid: The Case of Fe-Based Pnictides Korshunov, M. M.; Eremin, I.; Efremov, D. V. Physical Review Letters, Vol. 102, Issue 23 https://doi.org/10.1103/physrevlett.102.236403	journal	June 2009
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{BaFe}_{2} X_{3} (X = S, Se)

compounds

Journal Article · Thu Feb 26 19:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics · OSTI ID:1193207

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY

Antiferromagnetic and nematic phase transitions in BaFe2 (A s1-x Px) 2 studied by ac microcalorimetry and SQUID magnetometry

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Antiferromagnetic and nematic phase transitions in $BaF e_{2} {(A s_{1 - x} P_{x})}_{2}$ studied by ac microcalorimetry and SQUID magnetometry