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  • AIP Publishing  (5)
  • 1
    Online Resource
    Online Resource
    Anisotropic magnetodielectric coupling behavior of Ca3Co1.4Rh0.6O6 due to geometrically frustrated magnetism
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 105, No. 10 ( 2014-09-08)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 105, No. 10 ( 2014-09-08)
    Abstract: We have investigated the magnetic, dielectric, and magnetodielectric (MDE) behavior of a geometrically frustrated spin-chain system, Ca3Co1.4Rh0.6O6 (related to Ca3CoRhO6), in the single crystalline form for different orientations. The results bring out that the magnetic behavior of this compound is by itself interesting in the sense that this compound exhibits an anisotropic glassy-like magnetic behavior with a huge frequency (ν) dependence of ac susceptibility (χ) peak for an orientation along the spin-chain in the range of 30–60 K; this behavior is robust to applications of large external magnetic fields (H) unlike in canonical spin-glasses. The temperature dependence of dielectric constant also shows strong ν-dependence with similar robustness to H. The isothermal H-dependent dielectric results at low temperatures establish anisotropic MDE coupling. It is intriguing to note that there is a “step” roughly at one-third of saturation values as in the case of isothermal magnetization curves for same temperatures (for orientation along spin-chain), a correlation hitherto unrealized for geometrically frustrated systems.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4895699
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Raman study of Ca3Co2O6 single crystals
    AIP Publishing ; 2010
    In:  Journal of Applied Physics Vol. 108, No. 10 ( 2010-11-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 108, No. 10 ( 2010-11-15)
    Abstract: We report Raman scattering experiments on single crystals of Ca3Co2O6. The polarization dependent scattering was used to assign symmetry of the observed vibrational modes. The low temperature experiments show a subtle change in peak widths at 75 K. The increase in the peak widths is also accompanied by a gain in spectral weight for wave numbers greater than 1000 cm−1. We have associated the increase in peak widths to lattice distortion and the high frequency spectral feature to the inelastic light scattering processes involving two magnons. These observations are consistent with the reported extended x-ray absorption fine structure [Bindu et al., Phys. Rev. B 79, 094103 (2009)] and Mössbauer measurements [Paulose et al., Phys. Rev. B 77, 172403 (2008)] which suggests simultaneous presence of lattice distortion and short range magnetic order in the system well above the Néel temperature (24 K). Thus, our experiments highlight the usage of Raman spectroscopy as a tool to study systems which show precursor effects to magnetic transition.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3512899
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Sharp fall of electrical resistance for a small application of magnetic field on a metastable form of a compound, Tb5Si3, under pressure
    AIP Publishing ; 2009
    In:  Applied Physics Letters Vol. 95, No. 14 ( 2009-10-05)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 95, No. 14 ( 2009-10-05)
    Abstract: We report an unusual sensitivity of electrical resistivity (ρ) to an application of a small magnetic field in an intermetallic compound, Tb5Si3, under pressure. In this compound, there is a magnetic-field-induced first-order magnetic transition at 1.8 K. Under pressure, there is a metastable magnetic phase after reducing the field to zero. This metastable phase is relatively of higher ρ and interestingly a small magnetic field ( & lt;2 kOe) in the reverse direction results in a sharp fall of ρ to restore virgin state ρ. The present finding could be relevant in spintronic applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3243462
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Spin-glass features at multiple temperatures and transport anomalies in Tb4PtAl
    AIP Publishing ; 2019
    In:  Journal of Applied Physics Vol. 126, No. 12 ( 2019-09-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 126, No. 12 ( 2019-09-28)
    Abstract: The magnetic and electrical transport properties of Tb4PtAl, crystallizing in the Gd4RhIn-type cubic crystal structure characterized by three sites for the rare-earth, are reported by the measurements of magnetization, heat-capacity, and electrical resistivity (1.8–300 K). In comparison with the Gd analog, which has been shown to exhibit a complex magnetism with antiferromagnetism (TN = 64 K) entering into a spin-glass phase below 20 K, the spin-glass phase coexists at the onset of the antiferromagnetic order at 50 K in the Tb compound; additional spin-glass anomalies around 8 and 25 K are also found. Interestingly, the plot of electrical resistivity vs temperature develops a minimum in the presence of an external magnetic field above 50 K, and this transport behavior, unusual among rare-earth intermetallics, is presumably due to the gradual growth of short-range antiferromagnetic clusters as the long-range magnetic order develops.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.5121293
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 5
    Online Resource
    Online Resource
    Growth and characterization of high-quality single-crystalline SnTe retaining cubic symmetry down to the lowest temperature studied
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 120, No. 11 ( 2022-03-14)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 120, No. 11 ( 2022-03-14)
    Abstract: SnTe, an archetypical topological crystalline insulator, often shows a transition from a highly symmetric cubic phase to a rhombohedral structure at low temperatures. In order to achieve the cubic phase at low temperatures, we have grown SnTe employing the modified Bridgman method and studied its properties in detail. Analysis of the crystal structure using Laue diffraction and rocking curve measurements shows a high degree of single crystallinity and mosaicity of the sample. The magnetic susceptibility shows diamagnetic behavior, and the specific heat data match phonon contributions typical of a bulk insulator. Resistivity data exhibit metallic conduction similar to two-dimensional systems, and the signature of the structural transition has not been observed down to the lowest temperature studied. Detailed powder x-ray diffraction measurements show a cubic structure in the entire temperature range studied. This is supported by the angle-resolved photoemission data at low temperatures exhibiting a Dirac cone typical of a topological material. These results demonstrate that the ground state structure of SnTe can be stabilized in the cubic phase, providing a promising platform for quantum applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0086644
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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