Magnetotransport properties and pseudogap phase diagram of superconducting EuBa2Cu3Oy thin films: the influence of Eu substitution
This research explores and debates magnetotransport properties and the pseudogap phase diagram of high-temperature superconducting EuBa _2 Cu _3 O _y (EBCO) films through ρ _xx ( T ) and ρ _xy ( T ) measurements. The mixed state transport properties of samples with higher doped levels show a power-l...
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| Format: | Article |
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IOP Publishing
2018-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aac947 |
| _version_ | 1797750715974680576 |
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| author | Ying-Ting Chan Chih-Yi Wang Tsung-Chi Wu Dong Shen Chi-Te Liang Li-Min Wang |
| author_facet | Ying-Ting Chan Chih-Yi Wang Tsung-Chi Wu Dong Shen Chi-Te Liang Li-Min Wang |
| author_sort | Ying-Ting Chan |
| collection | DOAJ |
| description | This research explores and debates magnetotransport properties and the pseudogap phase diagram of high-temperature superconducting EuBa _2 Cu _3 O _y (EBCO) films through ρ _xx ( T ) and ρ _xy ( T ) measurements. The mixed state transport properties of samples with higher doped levels show a power-law field-dependence of activation energy U , U ∝ H ^−α with α = 0.52 ± 0.05, while the slightly doped samples reveal a logarithmic field-dependence of U . In addition, for the first time, all samples in the underdoped region display an unusual power-law behavior of U ∝ p ^γ with γ = −5.90 ± 0.28, which is qualitatively explained. A sign reversal of transverse resistivity in the mixed state is also present in the nearly optimum-doped samples, which have strong pinning energies. In the normal state, the cotangent of the Hall angle shows a wide range quadratic temperature dependence for all the samples, which can be described by Anderson’s theory. The values of spin excitation bandwidth W are coincident between two results obtained from the hidden Fermi-liquid theory and from the Hall angle for the slightly overdoped sample. Moreover, the phase diagram of EBCO, containing the superconducting transition temperatures, the T * and T ** temperatures in the pseudogap (PG) phase, and the antiferromagnetic transition temperatures θ _N , in the whole underdoped region has been completed and compared with those for YBa _2 Cu _3 O _y (YBCO). The findings demonstrate that EBCO has lower T * and T ** values, versus those of YBCO in the same doping region. The observed smaller magnitude of PG for EBCO is explained by considering the oxygen vibrational amplitudes in Cu−O−Cu bonds, which agrees with the inference based on the fluctuating bond model. The influence of Eu substitution is examined and discussed. |
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| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:36:54Z |
| publishDate | 2018-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-d6c2b28765e74731b593adde6a82cdc72023-08-08T14:50:25ZengIOP PublishingNew Journal of Physics1367-26302018-01-0120606304710.1088/1367-2630/aac947Magnetotransport properties and pseudogap phase diagram of superconducting EuBa2Cu3Oy thin films: the influence of Eu substitutionYing-Ting Chan0Chih-Yi Wang1Tsung-Chi Wu2Dong Shen3Chi-Te Liang4Li-Min Wang5Department of Physics, National Taiwan University , Taipei 106, TaiwanDepartment of Physics, National Taiwan University , Taipei 106, TaiwanDepartment of Physics, National Taiwan University , Taipei 106, TaiwanDepartment of Physics, National Taiwan University , Taipei 106, TaiwanDepartment of Physics, National Taiwan University , Taipei 106, TaiwanDepartment of Physics, National Taiwan University , Taipei 106, TaiwanThis research explores and debates magnetotransport properties and the pseudogap phase diagram of high-temperature superconducting EuBa _2 Cu _3 O _y (EBCO) films through ρ _xx ( T ) and ρ _xy ( T ) measurements. The mixed state transport properties of samples with higher doped levels show a power-law field-dependence of activation energy U , U ∝ H ^−α with α = 0.52 ± 0.05, while the slightly doped samples reveal a logarithmic field-dependence of U . In addition, for the first time, all samples in the underdoped region display an unusual power-law behavior of U ∝ p ^γ with γ = −5.90 ± 0.28, which is qualitatively explained. A sign reversal of transverse resistivity in the mixed state is also present in the nearly optimum-doped samples, which have strong pinning energies. In the normal state, the cotangent of the Hall angle shows a wide range quadratic temperature dependence for all the samples, which can be described by Anderson’s theory. The values of spin excitation bandwidth W are coincident between two results obtained from the hidden Fermi-liquid theory and from the Hall angle for the slightly overdoped sample. Moreover, the phase diagram of EBCO, containing the superconducting transition temperatures, the T * and T ** temperatures in the pseudogap (PG) phase, and the antiferromagnetic transition temperatures θ _N , in the whole underdoped region has been completed and compared with those for YBa _2 Cu _3 O _y (YBCO). The findings demonstrate that EBCO has lower T * and T ** values, versus those of YBCO in the same doping region. The observed smaller magnitude of PG for EBCO is explained by considering the oxygen vibrational amplitudes in Cu−O−Cu bonds, which agrees with the inference based on the fluctuating bond model. The influence of Eu substitution is examined and discussed.https://doi.org/10.1088/1367-2630/aac947high-Tc superconductoractivation energyHall anglephase diagram |
| spellingShingle | Ying-Ting Chan Chih-Yi Wang Tsung-Chi Wu Dong Shen Chi-Te Liang Li-Min Wang Magnetotransport properties and pseudogap phase diagram of superconducting EuBa2Cu3Oy thin films: the influence of Eu substitution New Journal of Physics high-Tc superconductor activation energy Hall angle phase diagram |
| title | Magnetotransport properties and pseudogap phase diagram of superconducting EuBa2Cu3Oy thin films: the influence of Eu substitution |
| title_full | Magnetotransport properties and pseudogap phase diagram of superconducting EuBa2Cu3Oy thin films: the influence of Eu substitution |
| title_fullStr | Magnetotransport properties and pseudogap phase diagram of superconducting EuBa2Cu3Oy thin films: the influence of Eu substitution |
| title_full_unstemmed | Magnetotransport properties and pseudogap phase diagram of superconducting EuBa2Cu3Oy thin films: the influence of Eu substitution |
| title_short | Magnetotransport properties and pseudogap phase diagram of superconducting EuBa2Cu3Oy thin films: the influence of Eu substitution |
| title_sort | magnetotransport properties and pseudogap phase diagram of superconducting euba2cu3oy thin films the influence of eu substitution |
| topic | high-Tc superconductor activation energy Hall angle phase diagram |
| url | https://doi.org/10.1088/1367-2630/aac947 |
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