Raman Phonons under Hydrostatic Pressure in YBa_2(Cu_<1-x>Ni_x)_4O_8
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We present a study of the Raman phonons in YBa<SUB>2</SUB> (Cu<SUB>0. 96</SUB>Ni<SUB>0. 04</SUB>) <SUB>4</SUB>O<SUB>8</SUB> under hydrostatic pressure in the superconducting phase. In contrast to the undoped material, two modes have significantly different pressure coefficients: the O (1) chain mode shifts 35% faster while the O (2) -O (3) in phase mode shifts 33% slower than their undoped counterparts. The other modes shift in a manner similar to the undoped material. We understand this behavior in terms of the smaller compressibility in the vicinity of the chain substituted Cu (Ni) atom.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 535-537, 1998
The Japan Society of High Pressure Science and Technology