First- and second-order magnetic and structural transitions in BaFe${}_{2(1\ensuremath{-}x)}$Co${}_{2x}$As${}_{2}$

First- and second-order magnetic and structural transitions in BaFe $_{2 (1 - x)}$ Co $_{2 x}$ As $_{2}$

C. R. Rotundu and R. J. Birgeneau

Phys. Rev. B 84, 092501 – Published 1 September 2011

Abstract

We present here high-resolution magnetization measurements on high-quality BaFe $_{2 (1 - x)}$ Co $_{2 x}$ As $_{2}$ , $0 ⩽ x ⩽ 0.046$ as-grown single crystals. The results confirm the existence of a magnetic tricritical point in the $(x, T)$ plane at $x_{tr}^{m} \approx 0.022$ and reveal the emergence of the heat-capacity anomaly associated with the onset of the structural transition at $x^{s} \approx 0.0064$ . We show that the extrapolated $T_{c}$ onset doping could be close to the magnetic tricritical point x $_{tr}^{m}$ .

Received 28 June 2011

DOI:https://doi.org/10.1103/PhysRevB.84.092501

Authors & Affiliations

C. R. Rotundu^1,* and R. J. Birgeneau^2,3

¹Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
²Department of Physics, University of California, Berkeley, CA 94720, USA
³Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA

^*CRRotundu@lbl.gov

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 84, Iss. 9 — 1 September 2011

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review B

covering condensed matter and materials physics

First- and second-order magnetic and structural transitions in BaFe $_{2 (1 - x)}$ Co $_{2 x}$ As $_{2}$

C. R. Rotundu and R. J. Birgeneau

Phys. Rev. B 84, 092501 – Published 1 September 2011

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Physical Review B

covering condensed matter and materials physics

First- and second-order magnetic and structural transitions in BaFe2(1−x)Co2xAs2

C. R. Rotundu and R. J. Birgeneau

Phys. Rev. B 84, 092501 – Published 1 September 2011

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Authorization Required

Other Options

Download & Share

Images

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Log In

Search

Article Lookup

Paste a citation or DOI

Enter a citation

First- and second-order magnetic and structural transitions in BaFe $_{2 (1 - x)}$ Co $_{2 x}$ As $_{2}$