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Matsumoto, Osamu; Utsuki, Aya; Tsukada, A.; Yamamoto, Hideki; Manabe, Takaaki; Naito, Makio

doi:10.1103/physrevb.81.099904

Cited by 12 publications

(15 citation statements)

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“…Recently, however, we have reported superconductivity with T c over 30 K in the parent compounds, T 0 -RE 2 CuO 4 (RE = Pr, Nd, Sm, Eu, and Gd) [1][2][3]. The origin of the sharp contradiction between the past and our results can be traced to impurity oxygen (O ap ) at the apical site.…”

Section: Introductioncontrasting

confidence: 78%

Material characterization of superconducting T′-Nd2CuO4 films synthesized by metal organic decomposition

Matsumoto

Tsukada

Yamamoto

et al. 2010

Physica C: Superconductivity and its Applications

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Section: Introductioncontrasting

confidence: 78%

Material characterization of superconducting T′-Nd2CuO4 films synthesized by metal organic decomposition

Matsumoto

Tsukada

Yamamoto

et al. 2010

Physica C: Superconductivity and its Applications

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“…We found λ L (T → 0) ≈ 1.6 ± 0.1 µm. Figure 8(a) presents the normalized superfluid den- 4 [thin dashed-dotted (olive) curve] for comparison. They are supposed to mimic the temperature dependence of N s (T ) for nodal (d-wave) and fully gapped (s-wave) superconductivity, respectively.…”

Section: F Penetration Depth and Superfluid Densitymentioning

confidence: 99%

Optical study of superconductingPr2CuOxwithx≃4

et al. 2014

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Superconducting Pr2CuOx, x ≃ 4 (PCO) films with T ′ structure and a Tc of 27 K have been investigated by various optical methods in a wide frequency (7 -55000 cm −1 ) and temperature (2 to 300 K) range. The optical spectra do not reveal any indication of a normal-state gap formation. A Drude-like peak centered at zero frequency dominates the optical conductivity below 150 K. At higher temperatures, it shifts to finite frequencies. The detailed analysis of the low-frequency conductivity reveals that the Drude peak and a far-infrared (FIR) peak centered at about 300 cm −1 persist at all temperatures. The FIR-peak spectral weight is found to grow at the expense of the Drude spectral weight with increasing temperature. The temperature dependence of the penetration depth follows a behavior typical for d-wave superconductors. The absolute value of the penetration depth for zero temperature is 1.6 µm, indicating a rather low density of the superconducting condensate.

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“…Finally, we discuss possible origins for the doped electrons in as-grown T -La 2 CuO 4 . In earlier studies of nominally undoped thin films of T -R 2 CuO 4 [14,16,39], it was speculated that the observed metallic and superconducting behaviors may originate from the collapse of the Mott gap, possibly caused by weakened correlations in the T phase. It has been suggested by DMFT calculations [17,18] that due to the lack of apical oxygens, the T -phase parent cuprates may exhibit weaker correlations and might be better described as Slater rather than Mott or charge-transfer insulators.…”

mentioning

confidence: 99%

“…The necessity of doping in achieving superconductivity and the validity of the doped Mott insulator paradigm in the n-type cuprates has recently been called into question by work on epitaxial thin films of nominally undoped RE 2 CuO 4 (RE = La, Pr, Nd, Sm, Eu, Gd) synthesized in the so-called T phase [14][15][16]. The authors have observed metallic and even superconducting behavior in the absence of cation doping, a scenario which may be consistent with dynamical mean field theory (DMFT) studies showing that the parent T compounds may be better described as weakly correlated Slater insulators rather than strongly correlated charge transfer insulators [17,18].…”

mentioning

confidence: 99%