Spin glass behavior in single crystals and sintered SrRuO3

Reich, S.; Tsabba, Y.; Cao, G.

doi:10.1016/s0304-8853(99)00326-1

Cited by 28 publications

(12 citation statements)

References 11 publications

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“…The diagonal terms of B give the stretching in the three axial directions and the off diagonal terms give the shear in the xy, yz, and zx planes. There is no peak shift as a function of frequency from 10 Hz to 10 kHz indicating the absence of spin glass behavior in contrast to the report by Reich et al 26 The peak shift in their samples was attributed to inhomogeneties in oxygen composition. Substitution of all elements except 20 at.…”

Section: ͑8͒contrasting

confidence: 85%

Effect of heterovalent ion substitution on the crystalline structure and magnetic ordering of SrRuO3

Nithya

Chandra

Valsakumar

et al. 2007

Journal of Applied Physics

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Structural and magnetic studies have been carried out on SrRu 1−x M x O 3 ͑M =Ga:x = 0.1; Cu and Zn: x = 0.1 and 0.2͒ in order to understand the dependence of the ferromagnetic transition temperature of SrRuO 3 on heterovalent magnetic and nonmagnetic cation substitution at the Ru site. Powder x-ray diffraction has been carried out to analyze the crystal structure using the Rietveld refinement procedure. T c decreases more rapidly for divalent cation dopants as compared to the trivalent cations. The refinement results show that there are distortions of the RuO 6 octahedra in the doped compounds, with little change in the lattice parameters. However, the direction and magnitudes of the tilt of the octahedra for all the compounds do not show correlation with the T c . Therefore, the change of T c is attributed to the charge and spin disorders introduced by the heterovalent dopant cations. The filled e g orbitals in Ga, Cu, and Zn ions are expected to have weak hybridization with the oxygen p orbitals as compared to the pristine compound, leading to a weakening of the overall ferromagnetic interactions between the Ru ions.

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Section: ͑8͒contrasting

confidence: 85%

Effect of heterovalent ion substitution on the crystalline structure and magnetic ordering of SrRuO3

Nithya

Chandra

Valsakumar

et al. 2007

Journal of Applied Physics

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“…34 Besides the exciting properties as described above, SrRuO 3 both in bulk as well as in thin-film forms, is reported to exhibit remarkable characteristics of spin-glass behavior. 10,[35][36][37] It has to be noted here that the subject of spin glass in condensed-matter physics is one of the most complex topics and has remained at the forefront of research to understand the subtleties involved in it. Albeit, there is only a couple of reports which show the spin-glass-like phase in SrRuO 3 , the microscopic understanding of the origin of such phenomena in this material is not completely understood yet.…”

Section: Introductionmentioning

confidence: 99%

Structural-modulation-driven low-temperature glassy behavior in SrRuO3

et al. 2012

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We present a critical investigation on the structural, magnetic, and magnetotransport properties of two sets of polycrystalline SrRuO 3 samples with uniquely defined ferromagnetic transition temperatures. The ac magnetic susceptibility study exhibits the remarkable memory effect, a distinct characteristic of glassy behavior, at low temperatures. The transport study suggests a crossover from Fermi-liquid to non-Fermi-liquid behavior. Most strikingly, the temperature-dependent magnetoresistance exhibits two distinct dips (one around ferromagnetic ordering temperature and the other around 50 K), resembling a double-well potential in appearance. In addition, the temperature-dependent coercive field shows a plateau around 50 K. An attempt has been made to employ neutron diffraction to understand the genesis of such unusual low-temperature magnetic features. From the neutron-diffraction study, we find the evidence for changes in the unit-cell lattice parameters around 60 K and, thus, believe that the low-temperature anomalous magnetic response is closely intertwined to lattice-parameter change.

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“…SrRuO 3 is an orthorhombic distorted perovskite (space group Pbnm), as is GdFeO 3 [3]. The Curie temperature of bulk SrRuO 3 ranges from 141 to 167 K, which has been reported differently by different authors [3][4][5][6]. The experimentally observed saturation magnetic moment 1.1m B /Ru is found to be less than the calculated value 2m B for a low-spin Ru 4þ state; but the effective magnetic moment m eff ¼ 2:60m B , calculated in the paramagnetic region, is close to that expected 2.83m B for Ru 4þ [7].…”

Section: Introductionmentioning

confidence: 99%

“…Different explanations for these behaviors have been reported. A large difference between the ZFC and FC curves as well as a sharp cusp in the ZFC curve was observed, and was taken as characteristic of spin glass [5]. An identical shape ZFC curve was calculated by using the notation of ''susceptibility", but there was a larger difference in magnitude for the highly anisotropic compounds such as SrRuO 3 [9].…”

Section: Introductionmentioning

confidence: 99%

Zero-Field-Cooled Magnetization and Coercivity of Itinerant Ferromagnet SrRuO3

Hou

Jiang

Ren

et al. 2002

phys. stat. sol. (a)

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Subject classification: 75.60.Ej; 75.50Dd Itinerant ferromagnetic SrRuO 3 with a Curie temperature T C ¼ 160:7 K was prepared by a conventional solid reaction method. Its zero-field-cooled (ZFC) magnetization and field-cooled (FC) magnetization were measured over a temperature interval from 5-180 K, in a sequence of applied fields up to coercivity. The major hysteresis loops were measured over a range of temperatures, which span the ordered phase. An empirical model was proposed to analyze the ZFC behaviors by means of coercivities at different temperatures. The calculated ZFC magnetization is consistent with the measured ZFC magnetization. Different ZFC magnetization behaviors were explained by using this model. The results indicate that the various ZFC behaviors originate from the comparison between the temperature dependence of FC magnetization and that of coercivity.

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Spin glass behavior in single crystals and sintered SrRuO3

Cited by 28 publications

References 11 publications

Effect of heterovalent ion substitution on the crystalline structure and magnetic ordering of SrRuO3

Effect of heterovalent ion substitution on the crystalline structure and magnetic ordering of SrRuO3

Structural-modulation-driven low-temperature glassy behavior in SrRuO3

Zero-Field-Cooled Magnetization and Coercivity of Itinerant Ferromagnet SrRuO3

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