English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The B20-type cobalt germanide CoGe was investigated by measuring the specificheat, resistivity, and $^{59}$Co nuclear magnetic resonance (NMR). We observeda phase transition at $T_Q=13.7$ K, evidenced by a very narrow peak of thespecific heat and sharp changes of the nuclear spin-spin ($T_2^{-1}$) andspin-lattice ($T_1^{-1}$) relaxation rates. The fact that the entropy releaseis extremely small and the Knight shift is almost independent of temperaturedown to low temperatures as anticipated in a paramagnetic metal indicates thatthe $T_Q$ transition is of non-magnetic origin. In addition, we detected acrossover scale $T_0\sim30$ K below which the resistivity and the NMR linewidthincrease, and $T_1^{-1}$ is progressively distributed in space, that is, astatic and dynamical spatial inhomogeneity develops. While the order parameterfor the $T_Q$ transition remains an open question, a group-theoretical analysissuggests that the finite electric quadrupole density arising from the low localsite symmetry at cobalt sites could drive the crystal symmetry lowering fromthe P2$_1$3 symmetry that is commensurate to the R3 symmetry with anincommensurate wavevector, which fairly well accounts for the $T_Q$ transition.The quadrupole-order-driven commensurate-incommensurate phase transition may beanother remarkable phenomenon arising from the structural chirality inherent inthe noncentrosymmetric B20 family.

Possible quadrupole-order-driven commensurate-incommensurate phase transition in B20 CoGe