NMR-NQR Study of the Crossover from the Spin-Glass to the Superconducting Phase in La2-xSrxCuO4

1999 ◽  
Vol 13 (09n10) ◽  
pp. 1235-1240
Author(s):  
M.-H. Julien ◽  
P. Carretta ◽  
F. Borsa ◽  
A. Rigamonti
Keyword(s):  
Low Temperature ◽  
Spin Glass ◽  
Correlation Length ◽  
Superconducting Phase ◽  
Spin Fluctuations ◽  
Relaxation Rates ◽  
Slowing Down ◽  
Spin Glass Behavior ◽  
Spin Freezing ◽  
Glass Behavior

139 La and 63 Cu NQR relaxation rates are used to obtain insights on the effects of itinerant holes on the magnetic in-plane correlation length, for x ≤ 0.04 in La 2-x Sr x CuO 4. For these concentrations, corresponding to spin-glass behavior at low temperature, evidence for the microsegregation of holes along stripes is presented. Preliminary relaxation results for an amount of Sr doping leading to superconductivity are also presented and discussed in terms of the crossover from the spin-glass to the underdoped superconducting regime: for x = 0.06 a slowing down of spin fluctuations is evidenced and superconductivity is found to coexist with spin-freezing.

Ce2PtGe3: a new ordered orthorhombic superstructure in the AlB2family with spin glass behavior

2017 ◽  
Vol 4 (12) ◽  
pp. 2097-2106 ◽  
Author(s):  
Sumanta Sarkar ◽  
Soumyabrata Roy ◽  
Deepti Kalsi ◽  
Sebastian C. Peter
Keyword(s):  
Low Temperature ◽  
Spin Glass ◽  
Space Group ◽  
Glass Material ◽  
Spin Glass Behavior ◽  
Glass Behavior

A new compound Ce2PtGe3crystallizing in a new ordered superstructure of the AlB2type with an orthorhombicCmcespace group was found to be a spin glass material at low temperature.

scholarly journals Role of spin-glass behavior in the formation of exotic magnetic states in GdB6

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
A. V. Semeno ◽  
M. A. Anisimov ◽  
A. V. Bogach ◽  
S. V. Demishev ◽  
M. I. Gilmanov ◽  
...  
Keyword(s):  
Spin Glass ◽  
Magnetic State ◽  
Magnetic Domains ◽  
Cubic Lattice ◽  
Universal Scaling ◽  
Spin Glass Behavior ◽  
Spin Freezing ◽  
Magnetic States ◽  
Glass Behavior

Abstract Randomness and frustration are believed to be two crucial criteria for the formation of spin glass state. However, the spin freezing occurs in some well-ordered crystals below the related temperature Tf due to the instability of each spin state, which induces the variation of either magnetic moment value or exchange energy. Here we explore the new mechanism of the in-site originated disorder in antiferromagnets Gd0.73La0.27B6 and GdB6, which is caused by the random mutual shifts of Gd3+ spins from the centrally symmetrical positions in the regular cubic lattice. The universal scaling of ESR linewidth temperature dependencies to the power law ΔH(T) ~ ((T − TD)/TD)α with α = − 1.1 ± 0.05 in the paramagnetic phase of both compounds demonstrates the identity of the origin of magnetic randomness. In Gd0.73La0.27B6 the resulting random spin configurations freeze at Tf ≈ 10.5 K where the maximum of magnetization is observed. Below Tf the splitting of ZFC and FC magnetization curves takes place as well as the magnetic state depends on the antecedent sample history. In the case of GdB6 the coherent displacement of Gd ions compete with these random shifts forming an antiferromagnetic (AFM) phase at TN = 15.5 K, which prevails over the spin freezing at Tf ≈ 13 K, expected from the ESR data. The observation of the hysteresis of the ESR spectrum in the AFM phase suggests that its properties may be determined by the competition of two types of AFM orders, which results in formation of stable magnetic domains with nonequivalent positions of AFM Gd pairs at T < 10 K.

scholarly journals Low Temperature Spin-glass Behavior in Nonmagnetic Atom Disorder Compound Pr2CuIn3

2015 ◽  
Vol 75 ◽  
pp. 703-710 ◽  
Author(s):  
Dexin Li ◽  
Yoshiya Homma ◽  
Fuminori Honda ◽  
Tomoo Yamamura ◽  
Dai Aoki
Keyword(s):  
Low Temperature ◽  
Spin Glass ◽  
Spin Glass Behavior ◽  
Glass Behavior

Narrowing of band gap and low-temperature spin glass behavior of FeNi co-doped ZnO nanowires

2009 ◽  
Vol 87 (5) ◽  
pp. 57004 ◽  
Author(s):  
Javed Iqbal ◽  
Xiaofang Liu ◽  
Abdul Majid ◽  
Dapeng Yu ◽  
Ronghai Yu
Keyword(s):  
Low Temperature ◽  
Spin Glass ◽  
Band Gap ◽  
Zno Nanowires ◽  
Spin Glass Behavior ◽  
Doped Zno ◽  
Co Doped ◽  
Glass Behavior

89Y AND 63Cu NMR-NQR AND SUSCEPTIBILITY STUDY OF UNDERDOPED SUPERCONDUCTING Y1-xCaxBa2Cu3O6.1

2000 ◽  
Vol 14 (25n27) ◽  
pp. 2797-2802 ◽  
Author(s):  
A. CAMPANA ◽  
P. CARRETTA ◽  
M. CORTI ◽  
A. LASCIALFARI ◽  
A. RIGAMONTI ◽  
...  
Keyword(s):  
Magnetic Moments ◽  
Nmr Relaxation ◽  
Lattice Relaxation ◽  
Superconducting Phase ◽  
Spin Fluctuations ◽  
Spin Lattice Relaxation ◽  
Freezing Process ◽  
Relaxation Rates ◽  
Spin Lattice ◽  
Spin Freezing

89 Y NMR relaxation has been used to study the spin freezing process in Y 1-x Ca x Ba 2 Cu 3 O 6.1. Substituting Ca 2+ for Y 3+ in the parent antiferromagnetic YBa 2 Cu 3 O 6.1 leads the system in the underdoped superconducting phase. In the normal state of the sample at x=0.15 the spin-lattice relaxation rate, which is not affected by the antiferromagnetic correlation of the Cu 2+ magnetic moments, still evidences a decrease of (1/ T 1 T ) on cooling, indicative of a pseudo-gap opening in the density of states around the Fermi energy. The most relevant result is found in the superconducting phase, where the recovery of the 89 Y NMR signal displays two distinct laws, pointing out different relaxation mechanisms without common spin temperature. One exponential recovery law yields a decay rate which decreases on cooling, as expected in the superconducting phase. The second relaxation process turns out to be described by a stretched exponential, with fast relaxation rates, strongly increasing on cooling, with a characteristic spin fluctuations frequency reaching the 20 MHz range at about 8 K. This observation is interpreted as the direct experimental evidence of the coexistence, at mesoscopic level, of superconductive and spin-glass like phases, the spin freezing process being described by the fast rate of the nuclear relaxation.

Spin-glass behavior, spin fluctuations, and superconductivity inSr2Y(Ru1−uCuu)O6

2003 ◽  
Vol 67 (5) ◽  
Author(s):  
Dale R. Harshman ◽  
W. J. Kossler ◽  
A. J. Greer ◽  
D. R. Noakes ◽  
C. E. Stronach ◽  
...  
Keyword(s):  
Spin Glass ◽  
Spin Fluctuations ◽  
Spin Glass Behavior ◽  
Glass Behavior
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