Effect of random disorder and spin frustration on the reentrant spin-glass and ferromagnetic phases in the stage-2<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>0.93</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mn>0.07</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cl</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>graphite intercalation compound near the multicr

The real and imaginary parts of the ac susceptibilities of powder BiMnO3 and BiMn1−xScxO3 (x = 0.1, 0.2, 0.3, 0.4, 0.5, and 0.7) samples have been measured as functions of temperature, different driving ac and applied dc magnetic fields, and different ac magnetic field frequencies. Both χ′ versus T and χ′′ versus T showed strong dependence on the parameters of the ac magnetic field for ferromagnetic samples BiMnO3 and BiMn1−xScxO3 (x = 0.1, 0.2, and 0.3), indicating that the ac field interacted mainly with the domain structure. In BiMn1−xScxO3 (x = 0.1, 0.2, and 0.3), a re-entrant spin-glass transition emerged at low temperatures. The re-entrant spin-glass transition temperature TRSG increased with increasing x (TRSG = 4 K for x = 0.1, TRSG = 5 K for x = 0.2, and TRSG = 9 K for x = 0.3). For BiMn1−xScxO3 (x = 0.4, 0.5, and 0.7), only the classical spin-glass transition was found (the freezing temperature Tf = 24 K for x = 0.4, Tf = 18 K for x = 0.5, and Tf = 7 K for x = 0.7) with characteristic frequency dependence of broad maxima on the χ′ versus T and χ′′ versus T curves and no dependence on the driving ac field.

Section: Discussionmentioning

confidence: 99%

Ac susceptibility studies of multiferroic BiMnO₃and solid solutions between BiMnO₃and BiScO₃

Belik¹,

Takayama‐Muromachi

2007

“…Magnetic materials with competing interactions have been investigated for the past several decades because of the exotic magnetic phases exhibited by them. Such materials also exhibit frustrated magnetic behavior, investigation of which is of great interest to the physicists working in this area [1][2][3]. Such frustrations in magnetic exchange interactions result in a glass-like magnetic state which arise out of cooperative interactions among spins.…”

Section: Introductionmentioning

confidence: 99%

Complex magnetic behaviour and evidence of a superspin glass state in the binary intermetallic compound Er₅Pd₂

Sharma

Yadav

Mukherjee

2018

The binary intermetallic compound ErPd has been investigated using dc and ac magnetic susceptibilities, magnetic memory effect, isothermal magnetization, non-linear dc susceptibility, heat capacity and magnetocaloric effect studies. Interestingly, even though the compound does not show geometrical frustration it undergoes glassy magnetic phase transition below 17.2 K. Investigation of dc magnetization and heat capacity data divulged absence of long-ranged magnetic ordering. Through the magnetic memory effect, time dependent magnetization and ac susceptibility studies it was revealed that the compound undergoes glass-like freezing below 17.2 K. Analysis of frequency dependence of this transition temperature through scaling and Arrhenius law; along with the Mydosh parameter indicate, that the dynamics in ErPd are due to the presence of strongly interacting superspins rather than individual spins. This phase transition was further investigated by non-linear dc susceptibility and was characterized by static critical exponents γ and δ. Our results indicate that this compound shows the signature of superspin glass at low temperature. Additionally, both conventional and inverse magnetocaloric effect was observed with a large value of magnetic entropy change and relative cooling power. Our results suggest that ErPd can be classified as a superspin glass system with large magnetocaloric effect.

“…Investigations of random magnets have attracted much attention from researchers for several decades [1][2][3][4][5][6][7]. Spin-glass (SG) freezing is associated with the randomness of exchange interactions due to a random distribution of magnetic impurities or due to crystallographic disorder.…”

Section: Introductionmentioning

confidence: 99%

Re-entrant spin-glass behaviour of geometrically frustrated SrFe₃(PO₄)₃O

Belik

Tsujii

Huang

et al. 2007

Four anomalies of magnetic origin were observed at T1 = 10.7 K, T2 = 11.7 K, Tf = 22.4 K, and Tc = 23.5 K in SrFe3(PO4)3O with a geometrically frustrated magnetic lattice using different techniques. SrFe3(PO4)3O shows features typical of re-entrant spin glass with the freezing temperature Tf in zero static magnetic field and the Curie temperature Tc. These features are the sharp upturn of the dc magnetization and ferromagnetic hysteresis loops on the M(H) curves below Tc, frequency-dependent rounded maxima on both the χ′(T) and χ′′(T) curves at different positions, a very small anomaly of specific heat at Tf, and strong suppression of spin-glass behaviour by magnetic fields above 0.1 T. High-field magnetization measurements revealed the existence of a 1/3-magnetization plateau above 25 T at T = 1.7 K. Magnetic reflections were observed below Tc on neutron powder diffraction patterns. Additional magnetic reflections appeared below T2.