On the pressure induced phase of Na{sub 2}CsC{sub 60}
- Sandia National Labs., Albuquerque, NM (United States)
- Argonne National Lab., IL (United States)
- Lawrence Livermore National Lab., CA (United States)
- Maryland Univ., College Park, MD (United States)
- Pennsylvania Univ., Philadelphia, PA (United States)
Neutron powder diffraction at pressures to 6 kbar in gaseous Ne has been used to study the pressure-induced phase transition and compressibilities of Na{sub 2}CsC{sub 60}. The pressure-induced phase can be achieved by compression to about 5 kbar at room temperature. If cooled, this phase can be retained below 200 K upon release of the pressure. The structure is orthorhombic as previously reported (but may differ in its detailed crystal structure) with lattice constants near 80 K and ambient pressure of a=9.385 A, b=10.06 A, and c=14.36 A. Corresponding linear compressibilities are 0.0004, 0014, and 0.0017 kbar{sup -1}, respectively. Identical pressure temperature cycling results in a superconductor with an unexpectedly low pressure dependence for {Tc} while in this phase. Models for the superconducting behavior of this compound are discussed.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States); Argonne National Lab., IL (United States); Lawrence Livermore National Lab., CA (United States); Pennsylvania Univ., Philadelphia, PA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000; FG02-86ER45254; W-7405-ENG-48; W-31109-ENG-38
- OSTI ID:
- 247416
- Report Number(s):
- SAND--96-1176C; ANL/MSD/CP--90766; CONF-960502--14; ON: DE96010563
- Country of Publication:
- United States
- Language:
- English
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