scholarly journals Pinning of the domain walls of the cluster spin-glass phase in the low-temperature-tetragonal phase ofLa2−xBaxCuO4

2001 ◽  
Vol 64 (13) ◽  
Author(s):  
F. Cordero ◽  
A. Paolone ◽  
R. Cantelli ◽  
M. Ferretti
Keyword(s):  
Low Temperature ◽  
Spin Glass ◽  
Tetragonal Phase ◽  
Glass Phase ◽  
Domain Walls ◽  
Spin Glass Phase ◽  
Cluster Spin Glass

THE CLUSTER SPIN-GLASS PHASE IN La2-xMxCuO4 (M=Sr OR Ba) AS AC PRECURSOR OF STRIPES

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3632-3636
Author(s):  
A. PAOLONE ◽  
F. CORDERO ◽  
R. CANTELLI ◽  
M. FERRETTI
Keyword(s):  
Glass Transition ◽  
Spin Glass ◽  
Glass Phase ◽  
Acoustic Spectrum ◽  
Spin Glass Phase ◽  
Spin Glass Transition ◽  
Cluster Spin Glass ◽  
Good Agreement

A cluster spin-glass transition has been identified in La 1.97 Ba 0.03 CuO 4, thanks to the analogies of the acoustic spectrum of this sample with that of La 2-x Sr x CuO 4 (x=0.03 and x=0.06), which has a well established cluster spin-glass phase. Our measurements are in good agreement with the presence of antiferromagnetically correlated clusters which are separated by hole rich boundaries. These "charge rivers" are thought to be the precursors of stripes.

scholarly journals Магнитные фазовые диаграммы R-=SUB=-1-x-=/SUB=-Sr-=SUB=-x-=/SUB=-(Mn-=SUB=-1-x/2-=/SUB=-Sb-=SUB=-x/2-=/SUB=-)O-=SUB=-3-=/SUB=- (R=La, Pr, Nd, Sm, Eu) с ионами марганца в трехвалентном состоянии

2018 ◽  
Vol 60 (9) ◽  
pp. 1717
Author(s):  
И.О. Троянчук ◽  
М.В. Бушинский ◽  
Н.В. Терешко ◽  
В. Сиколенко ◽  
C. Ritter ◽  
...  
Keyword(s):  
Rare Earth ◽  
Spin Glass ◽  
Glass Phase ◽  
Ionic Radius ◽  
Ferromagnetic State ◽  
Rare Earth Ions ◽  
Antiferromagnetic State ◽  
Spin Glass Phase ◽  
Cluster Spin Glass ◽  
Ferromagnetic Interactions

AbstractThe results of neutron-diffraction, magnetic, and magnetotransport studies of La_1 ‒ x Sr_ x (Mn _1- x /2 ^3+ Sb _ x /2 ^5+ )O_3 ( x ≤ 0.7) pervoskites, which contain only Mn^3+ ions, are reported. It is demonstrated that the system undergoes a transition from the antiferromagnetic state to the ferromagnetic one at x ∼ 0.2. Its structure then changes from O ′-orthorombic to O -orthorombic, which is attributable to orbital disordering. At x ≥ 0.6, the competition between antiferromagnetic and ferromagnetic interactions and strong diamagnetic dilution trigger the emergence of the cluster spin-glass phase. As the ionic radius of rare-earth ions in R_0.7Sr_0.3Mn_0.85Sb_0.15O_3 decreases, the ferromagnetic state transforms gradually into spin glass (R = Sm). All ferromagnetic compositions are dielectric in the magnetically ordered phase with strong magnetoresistive effects. It is assumed that ferromagnetism is induced by the strong covalency and orbital disordering.

Anelastic spectroscopy of the cluster spin-glass phase inLa2−xSrxCuO4

2000 ◽  
Vol 62 (9) ◽  
pp. 5309-5312 ◽  
Author(s):  
F. Cordero ◽  
A. Paolone ◽  
R. Cantelli ◽  
M. Ferretti
Keyword(s):  
Spin Glass ◽  
Glass Phase ◽  
Spin Glass Phase ◽  
Cluster Spin Glass

ANELASTIC SPECTROSCOPY AND NQR RELAXATION IN Sr-DOPEN La2CuO4 AROUND THE AF PERCOLATION THRESHOLD

2003 ◽  
Vol 17 (04n06) ◽  
pp. 512-520 ◽  
Author(s):  
A. PAOLONE ◽  
R. CANTELLI ◽  
F. CORDERO ◽  
M. CORTI ◽  
A. RIGAMONTI ◽  
...  
Keyword(s):  
Percolation Threshold ◽  
Spin Glass ◽  
Domain Walls ◽  
Spin Dynamics ◽  
Critical Value ◽  
Spin Glass Phase ◽  
Relaxation Measurements ◽  
Scattering Measurements ◽  
Cluster Spin Glass ◽  
The One

Anelastic spectra and 139 La NQR relaxation measurements have been carried out in La 2 - x Sr x CuO 4 (LSCO) for x around the critical value xc = 0.02 separating the antiferromagnetic (AF) from the cluster spin glass (CSG) phase for T → 0. The anelastic spectra around 10 K show step-like features common to samples pertaining to both AF and CSG phases. In the light of recent neutron scattering measurements suggesting that the spin-glass phase of LSCO with x < xc corresponds to a microscopic phase separation between regions with x ~ 0 and x ~ 0.02, the rise of the elastic energy dissipation has been attributed to the movement of the domain walls within the x ≃ xc CSG regions. The spin dynamics driving the AF transition has been investigated by means of 139 La NQR relaxation rate. The in-plane magnetic correlation length ξ2D has been extracted. In spite of the vicinity to the percolation threshold, ξ2D(x = 0.016, T) follows the temperature behavior expected in the renormalized classical regime, with spin stiffness reduced to about 0.4 of the one in pure La 2 CuO 4. Still, the 3D transition occurs when ξ2D is of the order of about 150 lattice steps, as in pure La 2 CuO 4, possibly related to the presence of AF regions unaffected by the holes.

Presence of Cluster Spin-Glass Phase in Naturally Grown Bilayered Brownmillerite Compound Ca[sub 2.4]La[sub 0.1]Sr[sub 0.5]GaMn[sub 2]O[sub 8]

2011 ◽  
Author(s):  
A. K. Bera ◽  
S. M. Yusuf ◽  
Amitabha Ghoshray ◽  
Bilwadal Bandyopadhyay ◽  
Chandan Mazumdar
Keyword(s):  
Spin Glass ◽  
Glass Phase ◽  
Spin Glass Phase ◽  
Cluster Spin Glass
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