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  • Yang, Hao  (5)
  • 2000-2004  (5)
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  • 2000-2004  (5)
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  • 1
    Online Resource
    Online Resource
    Enhanced dielectric properties of Ba1−xSrxTiO3 thin film grown on La1−xSrxMnO3 bottom layer
    AIP Publishing ; 2004
    In:  Journal of Applied Physics Vol. 96, No. 11 ( 2004-12-01), p. 6578-6584
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 96, No. 11 ( 2004-12-01), p. 6578-6584
    Abstract: The Ba0.7Sr0.3TiO3(BST)∕La0.67Sr0.33MnO3(LSMO) heterostructure has been fabricated by pulsed-laser deposition on (001) SrTiO3 single crystal substrate. The crystallization and surface morphology of the heterostructure have been characterized by x-ray diffraction and atomic force microscopy. The composition distribution along the depth of the heterostructure is analyzed by Auger electron spectroscopy. It is founded that the LSMO bottom layer shows a marked effect on the dielectric properties of the BST films. Comparing with BST∕YBCO (YBCO—YBa2Cu3O7) heterostructure grown by similar process, the dielectric loss exhibits much lower and less frequency dispersive, especially in the high frequency region. The loss tangent at 100kHz is about 0.012 and the figure of merit factor is about 25 under the condition of 200kV∕cm. Ferroelectric hysteresis measurement shows that the remanent polarization and coercive field of the heterostructure are 3.4μC∕cm2 and 39kV∕cm, respectively. These parameters are all better than BST∕YBCO heterostructure. The good surface morphology and the element diffusion between BST and LSMO layers may be suggested to be responsible for the above-improved parameters of BST∕LSMO heterostructure.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.1806254
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Positive temperature coefficient of resistivity in Pt∕(Ba0.7Sr0.3)TiO3∕YBa2Cu3O7-x capacitors
    AIP Publishing ; 2004
    In:  Applied Physics Letters Vol. 85, No. 21 ( 2004-11-22), p. 5019-5021
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 85, No. 21 ( 2004-11-22), p. 5019-5021
    Abstract: Pt ∕ ( Ba 0.7 Sr 0.3 ) TiO 3 ( BST ) ∕ YBa 2 Cu 3 O 7 - x ( YBCO ) capacitors were fabricated on (001) LaAlO3 substrates. The leakage current density-electric field characteristics were measured in the temperature range from 20 to 300K. In the electric field region of & gt;0.7MV∕cm for positively biased Pt electrode and & gt;1.4MV∕cm for negatively biased Pt electrode, the leakage current shows space-charge-limited-current behavior from 20 to 250K. Meanwhile a positive temperature coefficient of resistivity (PTCR) in the temperature range from 20 to 150K was observed and attributed to the strong negative temperature dependence of the dielectric constant of BST thin films.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1827928
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Abnormal temperature dependence of dielectric constant in (Ba0.7Sr0.3)TiO3 thin films
    AIP Publishing ; 2004
    In:  Applied Physics Letters Vol. 85, No. 18 ( 2004-11-01), p. 4106-4108
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 85, No. 18 ( 2004-11-01), p. 4106-4108
    Abstract: Pt ∕ ( Ba 0.7 Sr 0.3 ) TiO 3 ∕ YBa 2 Cu 3 O 7 − x capacitors were fabricated on LaAlO3 substrates. Dielectric and ferroelectric properties were measured in the temperature range from 20 to 250K. It was found that the dielectric constant decreased with decreasing temperature from 250 to ∼150K but then increased as the temperature continued to decrease to 20K. Considering this phenomenon along with the irregular temperature dependence of spontaneous polarization, it is indicated that such abnormal behavior originates in a second-order structural phase transition in the (Ba1−xSrx)TiO3 thin film in the vicinity of 150K.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1812575
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Leakage mechanism of (Ba0.7Sr0.3)TiO3 thin films in the low-temperature range
    AIP Publishing ; 2002
    In:  Applied Physics Letters Vol. 81, No. 25 ( 2002-12-16), p. 4817-4819
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 81, No. 25 ( 2002-12-16), p. 4817-4819
    Abstract: Pt /( Ba 0.7 Sr 0.3 ) TiO 3 ( BST )/ YBa 2 Cu 3 O 7−x ( YBCO ) capacitors on SrTiO3 substrates were fabricated, and the temperature dependence of their current–voltage characteristics was studied in the temperature range from 100 to 300 K. It was found that the leakage current strongly depends on the voltage polarity and temperature. In the case of a Pt electrode negatively biased at a high electric field ( & gt;400 kV/cm), the Pt/BST interface acts as a Schottky barrier with the barrier height of 0.47 eV in the temperature range from 200 to 300 K. When the YBCO electrode was biased negatively and the electrical field was maintained higher than 64 kV/cm, the leakage mechanism shows space-charge-limited-current behavior.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1529087
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2002
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Temperature- and field-dependent leakage current of Pt/(Ba0.7Sr0.3)TiO3 interface
    AIP Publishing ; 2003
    In:  Applied Physics Letters Vol. 83, No. 8 ( 2003-08-25), p. 1611-1613
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 83, No. 8 ( 2003-08-25), p. 1611-1613
    Abstract: Pt/(Ba 0.7 Sr 0.3 ) TiO 3 ( BST)/YBa 2 Cu 3 O 7− x (YBCO ) capacitors on SrTiO3 substrates were fabricated. The temperature and field dependence of the leakage current of Pt/BST interface were studied in the temperature range from 100 K to 320 K and in an electric field up to 3 MV/cm. For a middle electric field ( & lt;1 MV/cm), the leakage current shows space-charge-limited-current behavior in the temperature range from 100 K to 200 K. In the case of a high electric field ( & gt;1.8 MV/cm), the leakage mechanism is governed by the Fowler–Nordheim tunneling in the whole measured temperature range.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1604181
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2003
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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