H‐Mediated Magnetic Interactions between Layers in a 2D Mn^II–Dicyanamide Polymer: Neutron Diffraction, DFT, and Quantum Monte Carlo Calculations

Abstract

Abstract:We report neutron-diffraction investigations of the quasi-2D Mn II (dca) 2 (pym)(H 2 O) (pym = N 2 C 4 H 4 ) compound, where high-spin Mn II ions are bridged by dicyanamide anions, [N(CN) 2 ] -(herein abbreviated dca). Inside the layers, Mn 2+ ions are connected by single or double dca bridges. The magnetic phase diagram was established by neutron diffraction on a single crystal. In the low-field phase, the Mn II ions are antiferromagnetically ordered in the layers, with moments nearly parallel to the c axis, and the layers are antiferromagnetically coupled. The spin-flop phase corresponds to ferromagnetic coupling between the antiferromagnetic layers, in which the

Spatially anisotropic S=1 square-lattice antiferromagnet with single-ion anisotropy realized in a Ni(II) pyrazine- n,n′ -dioxide coordination polymer

“…Zero-field muon-spin relaxation (μ + SR) measurements were performed on Ni(NCS) 2 (pyzdo) 2 using the GPS spectrometer at the Swiss Muon Source, Paul Scherrer Institut, Villigen, Switzerland. For the measurement, the sample was packed in an Ag foil packet and suspended in the muon beam inside a 4 He cryostat. In the measurement, spin-polarized positive muons are implanted into the sample.…”

“…Toward this end, we have studied a variety of coordination-polymer magnetic systems with different dimensionalities, exchange energies, and spin quantum numbers (see, e.g., Refs. [2][3][4][5][6][7][8][9][10][11]). Within the field of quantum magnets, the subfield of two-dimensional (2D) systems is attractive due to the ability to support long-range entangled states [12] and the analogies to theories of high-temperature superconductivity (HTSC).…”