Possible Manifestation of Q-Ball Mechanism of High- T c Superconductivity in X-ray Diffraction

Condensed Matter

article

Sergei Mukhin¹ 

[1] Theoretical Physics and Quantum Technologies Department

关键词: Cooper-pairing ‘glue’;    Euclidean Q-balls;    micro X-ray diffraction;    ‘nesting’;    high-temperature superconductivity74.20.-z;    71.10.Fd;    74.25.Ha;   

DOI  :  10.3390/condmat8010016

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

It is demonstrated, that recently proposed by the author Q-ball mechanism of the pseudogap state and high-Tc superconductivity in cuprates may be detected in micro X-ray diffraction, since it imposes inverse correlations between the size and scattering intensities of the Q-ball charge-density-wave (CDW) fluctuations in these compounds. The Q-ball charge Q gives the number of condensed elementary bosonic excitations in a CDW fluctuation of finite amplitude. The attraction between these excitations inside Euclidean Q-balls is self-consistently triggered by the simultaneous condensation of Cooper/local pairs. Euclidean Q-ball solutions, analogous to the famous Q-balls of squarks in the supersymmetric standard model, arise due to the global invariance of the effective theory under the U ( 1 ) phase rotation of the Fourier amplitudes of the short-range CDW fluctuations. A conserved ‘Noether charge’ Q along the Matsubara time axis equals Q ∝ TM 2V, where the temperature T, Q-ball’s volume V, and fluctuation amplitude M enter. Several predictions are derived in an analytic form that follow from this picture. The conservation of the charge Q leads to an inverse proportionality between the volume V and X-ray scattering intensity ∼M 2 of the CDW puddles found in micro X-ray scattering experiments. The theoretical temperature dependences of the most probable Q value of superconducting Q-balls and their size and scattering amplitudes fit well the recent X-ray diffraction data in the pseudogap phase of high-Tc cuprates.

【 授权许可】

CC BY