Versatile helimagnetic phases under magnetic fields in cubic perovskite ${\mathbf{SrFeO}}_{\mathbf{3}}$

Versatile helimagnetic phases under magnetic fields in cubic perovskite ${SrFeO}_{3}$

S. Ishiwata, M. Tokunaga, Y. Kaneko, D. Okuyama, Y. Tokunaga, S. Wakimoto, K. Kakurai, T. Arima, Y. Taguchi, and Y. Tokura

Phys. Rev. B 84, 054427 – Published 9 August 2011

Abstract

A helical spin texture is of great current interest for a host of novel spin-dependent transport phenomena. We report a rich variety of nontrivial helimagnetic phases in the simple cubic perovskite ${SrFeO}_{3}$ under magnetic fields up to 42 T. Magnetic and resistivity measurements revealed that the proper-screw spin phase proposed for ${SrFeO}_{3}$ can be subdivided into at least five kinds of ordered phases. Near the multicritical point, an unconventional anomalous Hall effect was found to show up and was interpreted as due to a possible long-period noncoplanar spin texture with scalar spin chirality.

Received 4 July 2011

DOI:https://doi.org/10.1103/PhysRevB.84.054427

Authors & Affiliations

S. Ishiwata^1,2,*, M. Tokunaga³, Y. Kaneko⁴, D. Okuyama², Y. Tokunaga^2,4, S. Wakimoto⁵, K. Kakurai⁵, T. Arima⁶, Y. Taguchi², and Y. Tokura^1,2,4

¹Department of Applied Physics, Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan
²Cross-Correlated Materials Research Group (CMRG) and Correlated Electron Research Group (CERG), RIKEN-ASI, Wako 351-0198, Japan
³Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
⁴Multiferroics Project, ERATO, Japan Science and Technology (JST), c/o RIKEN, Wako 351-0198, Japan
⁵Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
⁶Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan

^*ishiwata@ap.t.u-tokyo.ac.jp

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Vol. 84, Iss. 5 — 1 August 2011

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Figure 1
Temperature dependence of (a) magnetization divided by external magnetic fields $H$ ( $0.1 -- 14 T$ along [111]), (b) resistivity $ρ_{x x}$ with dc current perpendicular to $H$ ( $0 -- 14 T$ along [111]), (c) $δ$ component of the helimagnetic propagation vector, and (d) integrated intensity of the scattering peak at ( $1 - δ 1 - δ - δ$ ) for a single crystal of ${SrFeO}_{3}$ . Representative peak profiles around ( $1 - δ 1 - δ - δ$ ) are shown in the inset. The unit r.l.u. is the abbreviation of reciprocal lattice unit.Reuse & Permissions
Figure 2
Magnetic-field dependence of magnetization along [111] at selected temperatures. Magnetization curves, except for the 4-K data, are shifted upward for clarity. The open triangles represent the transition fields. The field derivatives of magnetization $d M / d H$ for the data taken at 110 and 120 K are shown in the inset (the 120-K data are shifted upward for clarity).Reuse & Permissions
Figure 3
Magnetic-field dependence of resistivity at selected temperatures. The open and closed triangles represent the transition fields determined by the magnetization and resistivity data, respectively. For notations I–V, see Fig. 4. Pulsed high-magnetic fields were applied along [111], and the voltage was measured along the same direction. The resistivity at 4 K was measured after zero-field cooling (ZFC), under magnetic fields up to 20 T, and then was measured again at the same temperature under magnetic fields up to 40 T.Reuse & Permissions
Figure 4
Magnetic-phase diagram of ${SrFeO}_{3}$ . Magnetic field $H$ and the current direction are parallel to [111]. The solid lines separating phases I–V and the paramagnetic phase were determined by the $T$ - and $H$ -increasing runs of magnetization $M$ and resistivity $ρ_{x x}$ measurements. The thick and narrow lines indicate the first-order and second-order phase boundaries, respectively. The broken lines were determined by the $T$ -decreasing run of $ρ_{x x}$ . The shaded area was characterized as a hysteretic region associated with the $H$ -induced irreversible flop of the helical modulation vector as determined by the $H$ dependence of $ρ_{x x}$ measured after ZFC.Reuse & Permissions
Figure 5
(a) Magnetic-field $H$ dependence of Hall resistivity $ρ_{y x}$ measured on increasing $H$ ( $∥ [111]$ ). The $ρ_{y x}$ curves, except for the 20-K data, are shifted upward for clarity. The electric current is parallel to $[1 \bar{1} 0]$ . All the data were measured after field cooling at $H$ of 14 T. (b) Temperature dependence of $ρ_{y x}$ divided by $H$ of 10 T. The vertical broken line indicates the transition between phases II and III. (c) Contour map of $ρ_{y x}$ divided by $H$ . The horizontal broken line corresponds to the trace shown in (b).Reuse & Permissions

Physical Review B

covering condensed matter and materials physics

Versatile helimagnetic phases under magnetic fields in cubic perovskite ${SrFeO}_{3}$

S. Ishiwata, M. Tokunaga, Y. Kaneko, D. Okuyama, Y. Tokunaga, S. Wakimoto, K. Kakurai, T. Arima, Y. Taguchi, and Y. Tokura

Phys. Rev. B 84, 054427 – Published 9 August 2011

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Physical Review B

covering condensed matter and materials physics

Versatile helimagnetic phases under magnetic fields in cubic perovskite SrFeO3

S. Ishiwata, M. Tokunaga, Y. Kaneko, D. Okuyama, Y. Tokunaga, S. Wakimoto, K. Kakurai, T. Arima, Y. Taguchi, and Y. Tokura

Phys. Rev. B 84, 054427 – Published 9 August 2011

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Versatile helimagnetic phases under magnetic fields in cubic perovskite ${SrFeO}_{3}$