Probing electron quadrupling order through ultrasound
- URL: http://arxiv.org/abs/2404.03020v1
- Date: Wed, 3 Apr 2024 19:07:39 GMT
- Title: Probing electron quadrupling order through ultrasound
- Authors: Chris Halcrow, Ilya Shipulin, Federico Caglieris, Yongwei Li, Kunihiro Kihou, Chul-Ho Lee, Hans-Henning Klauss, Sergei Zherlitsyn, Vadim Grinenko, Egor Babaev,
- Abstract summary: Recent experiments have pointed to the formation of a new state of matter, the electron quadrupling condensate in Ba$_1-x$K$_x$Fe$$As$$.
The state spontaneously breaks time-reversal symmetry and is sandwiched between two critical points, separating it from the superconducting and normal metal states.
- Score: 2.0298162054079527
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Recent experiments have pointed to the formation of a new state of matter, the electron quadrupling condensate in Ba$_{1-x}$K$_x$Fe$_2$As$_2$ . The state spontaneously breaks time-reversal symmetry and is sandwiched between two critical points, separating it from the superconducting and normal metal states. The adjacent two critical points make acoustic effects a promising tool to study such states because of their sensitivity to symmetry-breaking transitions. We report a theory of the acoustic effects of systems with an electron quadrupling phase and new ultrasound velocity measurements of Ba$_{1-x}$K$_x$Fe$_2$As$_2$ single crystals. The presented theory for the electron quadrupling state gives the same type of singularities that are observed in experiment.
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