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SUMMARY:Exploring Superconductivity under High Pressure  - Prof Katsuya Sh
 imizu\, Osaka University
DTSTART:20231120T160000Z
DTEND:20231120T173000Z
UID:TALK208723@talks.cam.ac.uk
CONTACT:Siddharth Saxena (Montu)
DESCRIPTION:Speaker: Prof Katsuya Shimizu\,   \nKYOKUGEN\, Center for Scie
 nce and Technology under Extreme Conditions\, Graduate School of Engineeri
 ng Science\, Osaka University\n\nAbstract:\nHigh pressure is one of the us
 eful tools for studying material properties such as superconductivity. Not
  a few systems became superconductive under the combination of low tempera
 ture and high pressure. We have focused on simple elements for the candida
 te of superconductor and found that some elements exhibit relatively highe
 r critical temperature\, Tc at high pressure than at ambient. A lighter el
 ement is expected to show a higher Tc according to the conventional BCS th
 eory. An example is hydrogen. The appearance of superconductivity at room 
 temperature is predicted theoretically in the metallic phase [1]. However\
 , experimental realization of metallic hydrogen has not yet been attained.
  The highest Tc in elements was found in compressed calcium [2] with 30 K 
 at very high pressure exceeding 200 GPa. Recently\, Tc > 200 K was reporte
 d in high-pressure phases of hydrides [3-5].\n\nIn my talk\, the experimen
 tal investigations of pressure-induced superconductivity with our developm
 ents of high-pressure technique combined with low-temperature equipment wi
 ll be reviewed. The recent results of the onset of new hydride superconduc
 tors will also be presented.\n\n[1] C. F. Richardson\, N. W. Ashcroft\, Ph
 ys. Rev. Lett. 78\, 118 (1997).\n[2] M. Sakata\, et al.\, Phys. Rev. B 83\
 , 220512 (2011).\n[3] A. P. Drozdov\, et al.\, Nature 525\, 73 (2015).\n[4
 ] A. P. Drozdov\, et al.\, Nature 569\, 528 (2019).\n[5] M. Somayazulu\, e
 t al.\, Phys. Rev. Lett. 122\, 027001 (2019).\n\nBiography:\nProfessor Kat
 suya Shimizu is Professor at the Center for Science and Technology under E
 xtreme Conditions\, Osaka University\, Japan. He received his PhD from Osa
 ka University\, Japan. His interests is condensed matter physics at extrem
 e conditions\, and especially superconductivity under pressure. He was awa
 rded with the Van Valkenburg Award (1998)\, the Sir Martin Wood Prize (200
 0)\, the Nishina Memorial Prize (2001)\, the Prize for Superconducting Sci
 ence and Technology (2002)\, Bernd T. Matthias Prize (20018).\n\nE-mail: s
 himizu.katsuya.es@osaka-u.ac.jp\n\n\ncontact: Suchitra Sebastian (ses59@ca
 m.ac.uk) or Siddharth Saxena (sss21@cam.ac.uk)
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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