shortcode snipet : custom post archive

function shortcode_cp_archive( $atts ) {
    $post_type = get_query_var('post_type');
    if (empty($post_type)) {
        $post_type = 'post';
    }

    ob_start(); // Start output buffering
    echo '<ul class="list-no-mark">';
    wp_get_archives(array(
        'type'           => 'monthly',
        'show_post_count'=> 0,
        'post_type'      => $post_type,
    ));
    echo '</ul>';

    return ob_get_clean(); // Return the buffered output
}
add_shortcode('cp_archive', 'shortcode_cp_archive');

call like a
[cp_archive post_type="'work"]