Quantum phase transition in to collinear non–spin-flop state in magnetic field: A neutron diffraction study

V. P. Plakhty; S. V. Maleyev; S. V. Gavrilov; F. Bourdarot; S. Pouget; S. N. Barilo

doi:10.1209/epl/i2003-00162-1

All issues

Volume 61 / No 4 (February 2003)

Europhys. Lett., 61 4 (2003) 534-540

Abstract

Issue		Europhys. Lett. Volume 61, Number 4, February 2003


Page(s)		534 - 540
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2003-00162-1
Published online		01 February 2003

Europhys. Lett., 61 (4), pp. 534-540 (2003)

Quantum phase transition in $\chem{Pr_2CuO_4}$ to collinear non–spin-flop state in magnetic field: A neutron diffraction study

V. P. Plakhty¹, S. V. Maleyev¹, S. V. Gavrilov¹, F. Bourdarot²^,3, S. Pouget²^,3 and S. N. Barilo⁴

¹ Petersburg Nuclear Physics Institute RAS - Gatchina, 188300 St. Petersburg, Russia
² CEA-Grenoble, DRFMC/SPSMS/MDN - 38042 Grenoble Cedex 9, France
³ Institut Laue-Langevin - BP 156, 38042 Grenoble Cedex 9, France
⁴ Institute for Solid State and Semiconductor Physics BYAS - 220072 Minsk, Belarus

Received: 17 July 2002
Accepted: 4 December 2002

Abstract

In the external field applied to the tetragonal antiferromagnet $\chem{Pr_2CuO_4}$ , a transition is discovered from the phase with orthogonal antiferromagnetic spin subsystems along $[1,0,0]$ and $[0,1,0]$ to the phase with collinear spins, which are inclined about $45^\circ$ to the field. This phase is shown to be due to the interplane pseudodipolar interaction, and transforms into the spin-flop phase $(\bm{S}\perp\bm{H})$ asymptotically at very high field. The discovered phase transition is of first order, if the field is along $[1,0,0]$ , or $[0,1,0]$ , and becomes of second order if the field is slightly inclined to these axes. It holds at $T = 0$ and is a quantum one, with the transition field being the critical point and the angle between two subsystems below the critical point being the order parameter.

PACS: 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 75.50.Ee – Antiferromagnetics

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