Eur. Phys. J. B 77, 407-411 (2010)
https://doi.org/10.1140/epjb/e2010-00284-1

Structural and magnetic phase transitions in Pr_0.15Sr_0.85MnO₃ at high pressure

¹ Frank Laboratory of Neutron Physics, JINR, 141980 Dubna Moscow Reg., Russia
² Tula State University, 300600 Tula, Russia
³ Institute of Physics, Cukrovarnická 10, 16253 Prague 6, Czech Republic
⁴ Bayerisches Geoinstitute, University Bayreuth, 95440 Bayreuth, Germany
⁵ Helmholtz Centre Potsdam, Telegrafenberg, 14473 Potsdam, Germany
⁶ Laboratoire CRISMAT, ISMRa, Bd du Maréchal Juin, 14050 Caen, France

Corresponding author: ^a ekich@nf.jinr.ru

Received: 25 May 2010
Revised: 30 August 2010
Published online: 27 September 2010

Abstract

The crystal and magnetic structures of Pr_0.15Sr_0.85MnO₃ manganite have been studied by means of powder X-ray and neutron diffraction in the temperature range 10–400 K at high external pressures up to 55 and 4 GPa, respectively. A structural phase transition from cubic to tetragonal phase upon compression was observed, with large positive pressure coefficient of transition temperature dT_ct/dP = 28(2) K/GPa. The C-type antiferromagnetic (AFM) ground state is formed below T_N ≈ 260 K at ambient pressure. While at ambient pressure the structural and magnetic transition temperatures are close, T_ct ~ T_N, upon compression they become decoupled with T_N ≪ T_ct due to much weaker T_N pressure dependence with coefficient dT_N/dP = 3.8(1) K/GPa.