Origin of the Griffiths phase and correlation with the magnetic phase transition in the nanocrystalline manganite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>0.4</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>Ca</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>0.6

Saha, Shriya; Dutta, Apurba; Gupta, Shuvankar; Bandyopadhyay, S.; Das, I.

doi:10.1103/physrevb.105.214407

Cited by 13 publications

(7 citation statements)

References 97 publications

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“…The positive values of λ confirm the presence of Griffiths phase in the doped samples. λ represents the strength of the Griffith phase [32]. The value of the Griffith exponent in the case of sample 3 is more as compared to sample 4.…”

Section: Resultsmentioning

confidence: 99%

Lattice effects on the physical properties of half-doped perovskite ruthenates

Brar

Singh

Kuga

et al. 2023

J. Phys.: Condens. Matter

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We investigate the unusual phase transitions in SrRuO3 and Sr0.5Ca0.5Ru1−xCrxO3 (x=0,0.05and 0.1) employing x-ray diffraction, resistivity, magnetic studies and x-ray photoemission spectroscopy. Our results show the compounds undergo a crossover from itinerant ferromagnetism tolocalized ferromagnetism. The combined studies suggest Ru and Cr be in the 4+ valence state. AGriffith phase and an enhancement in Curie temperature (Tc) from 38 K to 107 K are observed withCr doping. A shift in the chemical potential towards the valence band is observed with Cr doping.In the metallic samples, interestingly, a direct link between the resistivity and orthorhombic strainis observed. We also observe a connection between orthorhombic strain and Tc in all thesamples. Detailed studies in this direction will be helpful to choose suitable substratematerials for thin-film/device fabrication and hence manoeuvre its properties. In thenon-metallic samples, the resistivity is mainly governed due to disorder, electron-electron correlation effects and a reduction in the number of electrons at the Fermi level. The value ofthe resistivity for the 5% Cr doped sample suggests semi-metallic behaviour. Understanding itsnature in detail using electron spectroscopic techniques could unravel the possibility of its utilityin high-mobility transistors at room temperature and its combined property with ferromagnetismwill be helpful in making spintronic devices.

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Section: Resultsmentioning

confidence: 99%

Lattice effects on the physical properties of half-doped perovskite ruthenates

Brar

Singh

Kuga

et al. 2023

J. Phys.: Condens. Matter

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“…The obtained results are presented in figure 3, which shows the Curie temperature (T C = 290 K), as deduced from the dM/dT versus T curve displayed in the inset of figure 3. The phase transition width obtained from the full width at half maximum of the dM/dT versus T plot was approximately 100 K. The transition is not longrange FM ordering, suggesting that above T C , short-range magnetic ordering is possible in the sample [29]. To gain insight into the magnetic nature of the sample, isothermal magnetization data were obtained as a function of the applied field M(H), and are illustrated in figure 4(a) for the temperature range of 245-335 K. Arrott plots (H/M versus M 2 curves) were constructed from the M(H) data, as shown in figure 4(b).…”

Section: Resultsmentioning

confidence: 89%

“…Experimental investigations of GP have been conducted in various systems, including manganites [27][28][29], cobaltites [30,31], double perovskites [32,33], and several other materials [34,35]. GP originates from many different causes, such as structural disorder resulting from the introduction of dopant elements at different sites of the material [30,31], Jahn-Teller distortion [27][28][29], and grain size variation [27,28].…”

Section:  mentioning

confidence: 99%

Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La_0.7Sr_0.3Mn_1−xFe_xO₃ (x = 0.05) nanoparticle

Thanh,

Van Quynh,

Thi Ngoc Nha

et al. 2023

Phys. Scr.

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The magnetic behavior of the La0.7Sr0.3Mn0.95Fe0.05O3 nanoparticles was investigated. X-ray diffraction analysis revealed that this sample exhibited rhombohedral symmetry with R3-c space group. The sample underwent a ferromagnetic-paramagnetic transition at approximately 290 K, characterized by a second-order phase transition. Interestingly, the state above the transition temperature is not purely paramagnetic but rather exhibits a short-range ferromagnetic order or Griffiths phase, which becomes more pronounced as the temperature increases up to the Griffiths transition temperature (∼345 K). The values of the critical exponents obtained in this study, β = 0.671, γ = 1.087, and δ = 2.612, with TC = 290.09 K, are distinct from those of any known universality class, and are confirmed by a single scaling equation of state. This unusual behavior is ascribed to the existence of the Griffiths phase, which reflects the unconventional critical behavior of magnetic susceptibility. In addition to conventional magnetic measurements, detailed studies of isothermal magnetization and magnetocaloric effects have been performed, and theoretical analyses have been utilized to further explore the Griffiths phase. Furthermore, a correlation between the Griffiths phase and the anomalous critical parameters was established.

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“…The presence of GP can be attributed to the presence of large ASD content in YNCO nanoparticles. From figure 4(d), the GP lies in the temperature region T C < T < T G , where the system does not show a true paramagnetic (PM) behavior or a long-range FM ordering [17]. Here, T C represents the ferromagnetic-like phase transition temperature and T G is known as the Griffiths temperature.…”

Section: Magnetic Characterizationmentioning

confidence: 99%

“…Interestingly, the disordering of transition metals Ni and Cr in La 2 NiCrO 6 double perovskite is found to exhibit a disordered-induced Griffithslike phase (GP) by the competition between different magnetic interactions close to the phase transition temperature [15,16]. A GP is related to the nucleation of small and weakly correlated clusters (short-range order) embedded in a paramagnetic (PM) matrix, resulting in a magnetic phase where the system neither behaves like a PM nor shows longrange ordering [7,[17][18][19]. The disordered double perovskites which possess a GP have several potential applications in spintronic devices [7,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y₂NiCrO₆ double perovskite

Islam,

Tarek,

Asif Adib

et al. 2024

J. Phys. D: Appl. Phys.

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In this investigation, nanoparticles of B-site disordered Y2NiCrO6 (YNCO) double perovskite were synthesized by the facile sol-gel method to evaluate their magnetic and electrochemical properties. Their crystallgraphic structure is monoclinic and the average size of the particles is 79±16 nm. XPS analysis indicated a mixed oxidation states of B-site transition metals Ni2+/Ni3+ and Cr2+/Cr3+. The mixed valence states of Ni and Cr, along with the mixed magnetic phases of YNCO, constitute a signature of the B-site disorder. This antisite disorder contributed to the observation of a Griffiths-like phase arising from ferromagnetic short-range interactions above the magnetic transition up to the Griffiths temperature, TG=137 K. The synthesized YNCO double perovskite demonstrated a promising behavior as an electrode material for electrochemical supercapacitors. In a three-electrode system, it displayed a specific capacitance of 270 F g-1 at a current density of 0.5 A g-1. In a symmetric two-electrode system, YNCO exhibited a specific capacitance of 180 F g-1 at 0.5 A g-1, alongside an energy density of 6.25 Wh kg-1 at 250 W kg-1 power density. In both cases, we employed a mild 0.5 M neutral aqueous Na2SO4 solution as the electrolyte, in contrast to the typically employed corrosive and concentrated alkaline aqueous solution. The fascinating magnetic and charge storage properties of the B-site disordered YNCO double perovskite indicate its potential for use in spintronic devices and as efficient electrodes in symmetric hybrid supercapacitors.

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Origin of the Griffiths phase and correlation with the magnetic phase transition in the nanocrystalline manganiteLa0.4(Ca0.5Sr0.5)0.6

Cited by 13 publications

References 97 publications

Lattice effects on the physical properties of half-doped perovskite ruthenates

Lattice effects on the physical properties of half-doped perovskite ruthenates

Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La_0.7Sr_0.3Mn_1−xFe_xO₃ (x = 0.05) nanoparticle

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y₂NiCrO₆ double perovskite

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Origin of the Griffiths phase and correlation with the magnetic phase transition in the nanocrystalline manganiteLa0.4(Ca0.5Sr0.5)0.6

Cited by 13 publications

References 97 publications

Lattice effects on the physical properties of half-doped perovskite ruthenates

Lattice effects on the physical properties of half-doped perovskite ruthenates

Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La0.7Sr0.3Mn1−xFexO3 (x = 0.05) nanoparticle

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y2NiCrO6 double perovskite

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Product

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Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La_0.7Sr_0.3Mn_1−xFe_xO₃ (x = 0.05) nanoparticle

B-site disorder driven Griffiths-like phase and electrochemical behavior in Y₂NiCrO₆ double perovskite