Noncollinear magnetic order in the S = ½ magnet Sr3ZnRhO6

Hillier, A. D. ; Adroja, D. T. ; Kockelmann, W. ; Chapon, L. C. ; Rayaprol, S. ; Manuel, P. ; Michor, H. ; Sampathkumaran, E. V. (2011) Noncollinear magnetic order in the S = ½ magnet Sr3ZnRhO6 Physical Review B: Condensed Matter and Materials Physics, 83 (2). 024414_1-024414_8. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v83/i2/e024414

Related URL: http://dx.doi.org/10.1103/PhysRevB.83.024414

Abstract

The compound Sr3ZnRhO6 with S=½ belongs to a family of pseudo-one-dimensional (1D) spin-chain systems with general formula A3A'BO6. The nature of the ground state of Sr3ZnRhO6 is investigated using microscopic techniques such as muon spin relaxation (μSR) and powder neutron diffraction in addition to bulk characterization using magnetization, ac-susceptibility, and heat capacity. Our μSR study clearly reveals the presence of three frequencies, below 16 K, whose temperature dependence follow a mean-field order parameter indicating long-range magnetic ordering of the Rh4+ moment. Powder neutron diffraction reveals the presence of four weak magnetic Bragg peaks below 16 K, indexed by the propagation vector k=(0,½,1) in the hexagonal setting of the space group R3̲c. Analysis of the magnetic diffraction pattern constrained to symmetry-adapted magnetic modes reveals a noncollinear magnetic structure with an ordered magnetic moment of Rh4+=0.7(1) μB. This is the first compound in this spin chain family which exhibits noncollinear magnetic order with the moment tilting away from the c axis, highlighting the important role of interchain and intrachain interactions.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:92912
Deposited On:06 Jun 2012 13:50
Last Modified:06 Jun 2012 13:50

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