A new, updated account of poroid fungi in North America
Poroid fungi, commonly known as "polypores," are among the most frequently encountered fungi throughout the year because of their large ...
{"id":14258,"date":"2016-12-02T14:49:33","date_gmt":"2016-12-02T14:49:33","guid":{"rendered":"https:\/\/bioengineer.org\/superconductivity-of-pure-bismuth-crystal-at-0-00053-k\/"},"modified":"2016-12-02T14:49:33","modified_gmt":"2016-12-02T14:49:33","slug":"superconductivity-of-pure-bismuth-crystal-at-0-00053-k","status":"publish","type":"post","link":"https:\/\/bioengineer.org\/superconductivity-of-pure-bismuth-crystal-at-0-00053-k\/","title":{"rendered":"Superconductivity of pure Bismuth crystal at 0.00053 K"},"content":{"rendered":"
The properties of the 83rd element of the periodic table, namely, Bismuth (Bi) have been studied for more than a century and still continues to draw enormous scientific interests due to its anomalous electronic properties. <\/p>\n
Bulk rhombohedral Bismuth (Bi) at ambient pressure is a semi-metal and it remains in the normal state down to 0.010 K. Unlike metals where there is roughly one mobile electron per atom, in a semi-metal like Bi, the concentration of mobile electrons is extremely low (100,000 atoms share a single mobile electron). Hence, the superconductivity (SC) in bulk is thought to be very unlikely due to this extremely low carrier density. <\/p>\n
Now, a group of TIFR scientists led by Professor S. Ramakrishnan have discovered superconductivity of a high quality single crystal of Bi (99.998% pure) at 0.00053 K with a critical field of 0.000005 Tesla (nearly 1\/8 of earth's magnetic field). The discovery was made by observing a diamagnetic signal using a home made ultra sensitive magnetometer which is housed in a state of the art TIFR copper nuclear refrigerator built in 2011. This discovery cannot be explained by standard models of superconductivity. A new theory is necessary since the assumption that the electronic (Fermi) energy is much larger than the lattice (vibration) energy used in standard models fails in Bismuth. <\/p>\n
This exciting discovery has recently been published in Science (online 1 Dec 2016 http:\/\/science.sciencemag.org\/content\/early\/2016\/11\/30\/science.aaf8227) <\/p>\n
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