Interplay between low dimensionality and magnetic frustration in the magnetoelectric pyroxenesLiCrX2O6(X=

Abstract

We have investigated the magnetic and magnetoelectric properties of LiCrGe 2 O 6 and reinvestigated the magnetic properties of LiCrSi 2 O 6 . Using superconducting quantum interference device magnetometry, electrical polarization, and neutron diffraction, we give evidence for the presence of magnetic frustration in the magnetoelectric pyroxenes LiCrX 2 O 6 ͑X =Si, Ge͒. While pyroxene materials have been widely investigated for their low dimensional properties, we suggest that the magnetic frustration is likely to play a more important role into the nature of the magnetic ground state. The existence and possible interplay of low dimensionality and magnetic frustration resulting in multiferroic and/or magnetoelectric properties in the pyroxenes will probably open new avenues to tune and investigate the richness of the physic in this family.

One-dimensional short-range magnetic correlations in the magnetoelectric pyroxeneCaMnGe2O6

“…The renewed interest arose from the recent observation of magnetically driven ferroelectricity in NaFe(Si/Ge) 2 O 6 [11,12], the magnetoelectric effect in LiCr(Si/Ge) 2 O 6 [13], NaCrSi 2 O 6 [14], and LiFeSi 2 O 6 [11], and the expected ferrotoroidal order in LiFe(Si/Ge) 2 O 6 [15]. These intriguing physical properties are attributed to the existence and possible interplay of low dimensionality and magnetic frustration [13].…”

Three different Ge environments in a new Sr5CuGe9O24phase synthesized at high pressure and high temperature

“…Compounds of the pyroxene family, which can incorporate all the 3d transition metal elements, have recently attracted considerable interest thanks to their original and diverse magnetic properties, including multiferroism (Jodlauk et al, 2007;Kim et al, 2012;Ding et al, 2016a), linear magnetoelectric effect (Né nert et al, 2010;Ding et al, 2016b) or quasione-dimensional magnetic behaviour (Valentí et al, 2002). Such physical properties stem essentially from their unique quasi-one-dimensional crystal structure and the competition between inter-and intra-chain magnetic interactions.…”

Insights into the evolution from ferromagnetism to antiferromagnetism: A doping-dependent study of NaCrSixGe2−xO6(0≤Yan1, Kolesnikov2 2019Phys. Rev. B1000View full textAdd to dashboardCite

“…Cr-based pyroxenes with (Li,Na)Cr(Si,Ge) 2 O 6 chemical formula represent a unique group of materials exhibiting fascinating magnetic properties fine-tuned by crystal structure and local distortion that can be attributed to different atom radii on the A-site and Bsite 10,11,[16][17][18][19][20][21][22] . In these compounds, the electronic configuration of Cr 3+ is d 3 (S=3/2) resulting in half-filled t 2g and empty e g orbitals.…”

“…Prior study has shown that the crystal structure is sensitive to the atom radii on the Asite: NaCr(Si,Ge) 2 O 6 crystallize in a monoclinic unit cell with space group C2/c 11,16 , whereas LiCr(Si,Ge) 2 O 6 17 adopt P 2 1 /c structure at low temperature indicating that replacing Na (ionic radius R IV N a 1+ =1.02Å) with Li (ionic radius R IV Li 1+ =0.76Å) reduces the symmetry of the material. Amongst them, LiCr(Si,Ge) 2 O 6 10 and NaCrSi 2 O 6 11 exhibit magnetoelectric effect with antiferromagnetic (AFM) ground state at zero field except for NaCrGe 2 O 6 which shows different magentic behavior. To our knowledge, NaCrGe 2 O 6 is the only pyroxene with fer- Only the Cr 3+ (red balls) magnetic ions are shown for clarity.…”