Anisotropic Local Modification of Crystal Field Levels in Pr-Based Pyrochlores: A Muon-Induced Effect Modeled Using Density Functional Theory

Abstract

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Quantum magnetism in molecular spin ladders probed with muon-spin spectroscopy

“…We show here the ways in which implanted muons are sensitive to the different phases in the spin ladder materials and also to low frequency dynamics. Notably, our first principles calculations of the nature of the muon stopping site suggest that the muon's sensitivity to the physics in these systems derives from a local distortion it makes to the crystal structure in its vicinity, which leads to a significant perturbation to the local magnetism (though in a quite different manner to that found in pyrochlore oxides [20]). Despite this, the muon continues to prove a useful probe of the global magnetic properties of the materials, allowing us in the case of (Hpip) 2 CuBr 4 , for example, to identify phase boundaries in agreement with those suggested by other techniques.…”

Gapped ground state in the zigzag pseudospin-1/2 quantum antiferromagnetic chain compound PrTiNbO6

“…At low temperatures, the formation of the pseudospin-1 2 quasi-doublet with the strong Ising anisotropy [45] resembles non-Kramers GS doublets in the 3D pyrochlore compounds Pr 2 TM 2 O 7 (TM = Sn, Zr, Hf, and Ir), where Ising anisotropy had been reported too [46][47][48][49][50]. It is thus logical to use a similar NN pseudospin- 1 2 Hamiltonian for interactions along the zigzag chain.…”

FeTi2O5 : A spin Jahn-Teller transition enhanced by cation substitution

“…This site represents a simple distortion from the location of the maximum potential towards the nearest oxygen, with which the muon forms a 1.0 A O-H like bond. Such bonds appear to be typical for muon sites in oxygen containing compounds [15][16][17][18] . This fully relaxed site is also completely consistent with that found in CoTi 2 O 5 , al- though the local distortions it causes are subtly different.…”