Liquidlike correlations in single-crystalline Y2Mo2O7: An unconventional spin glass

Abstract

31The spin glass behavior of Y 2 Mo 2 O 7 has puzzled physicists for nearly three decades. Free of bulk 32 disorder within the resolution of powder diffraction methods, it is thought that this material is a rare 33 realization of a spin glass resulting from weak disorder such as bond disorder or local lattice distortions.

Magnetic ordering in the frustratedJ1−J2Ising chain candidateBaNd2O4

“…Due to the magnetic frustration inherent in these materials, non-collinear magnetic ground states often form that can lead to multiferroic behavior [5]. In other cases, conventional long-range magnetic order is replaced by short-range alternatives, including spin glasses [6], spin liquids [7,8], and spin ices [9][10][11].…”

Spin freezing in the disordered pyrochlore magnet NaCaCo2F7 : NMR studies and Monte Carlo simulations

“…Here, the B site hosts high-spin Co 2+ in CoF 6 octahedra, whereas the A site contains a random distribution of Na and Ca ions, giving rise to exchange (bond) disorder for the magnetic degrees of freedom. Bond disorder can lift degeneracies and lead to new unconventional ground states, both long-range ordered [5,6] and glassy [7][8][9][10].The uniform susceptibility of NaCaCo 2 F 7 displays a Curie-Weiss law with a characteristic temperature Θ CW ≈ −140 K and a moment of 6.1 µ B per Co, the latter suggesting an orbital contribution in addition to the S = 3/2 state of Co 2+ . Despite the Θ CW ≈ −140 K, the material does not display a long-range-ordered magnetic state down to temperatures of 0.6 K [4].…”

“…Here, the B site hosts high-spin Co 2+ in CoF 6 octahedra, whereas the A site contains a random distribution of Na and Ca ions, giving rise to exchange (bond) disorder for the magnetic degrees of freedom. Bond disorder can lift degeneracies and lead to new unconventional ground states, both long-range ordered [5,6] and glassy [7][8][9][10].…”

NaCaNi2F7: A frustrated high-temperature pyrochlore antiferromagnet withS=1NKrizan1, Cava2 2015Phys. Rev. B474550View full textAdd to dashboardCite

“…11,12 While single crystals are available of Y 2 Mo 2 O 7 , other transition-metal-based traditional oxide pyrochlores, many of which show antiferromagnetic interactions and exhibit glassy behavior, are not available as large single crystals and do not show the same level of frustration as the fluorides. [13][14][15][16] There is theoretical interest in the FeF 3 pyrochlore, but unfortunately, the methods employed for its synthesis likely preclude the growth of this material as large single crystals. 15,17,18 In contrast, the S = 1 NaCaNi 2 F 7 and S = 3/2 NaCaCo 2 F 7 and NaSrCo 2 F 7 fluoride pyrochlores have now been grown as cm-scale single crystals, suggesting that transition metal fluorides have the potential to develop into a significant and readily accessible new family of geometrically frustrated magnets.…”