Classifier Instance:

Anchor text: K.A. Müller
Target Entity: Karl_Alexander_M\u00fcller
Preceding Context: High-temperature singlet d-wave superconductivity was discovered by J.G. Bednorz and
Succeeding Context: in 1986, who discovered that the lanthanum-based cuprate perovskite material LaBaCuO 4 develops superconductivity at a critical temperature (T c ) of approximately 35 K (-238 degrees Celsius). This is well above the highest critical temperature known at the time (T c = 23 K) and thus the new family of materials were called high-temperature superconductors. Bednorz and Müller received the Nobel prize in Physics for this discovery in 1987. Since then, many other high-temperature superconductors have been synthesized. As early as 1987, superconductivity above 77 K, the boiling point of nitrogen, was achieved. This is highly significant from the point of view of the technological applications of superconductivity, because liquid nitrogen is far less expensive than liquid helium, which is required to cool conventional superconductors down to their critical temperature. The current record critical temperature is about T c  = 133 K (−140 °C) at standard pressure, and somewhat higher critical temperatures can be achieved at high pressure. Nevertheless at present it is considered unlikely that cuprate perovskite materials will achieve room-temperature superconductivity.
Paragraph Title: null
Source Page: Unconventional superconductor

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